Closterium, (6, 7, fig. 5.) Family 6. ASTASIEA WE. Animals evi dently or apparently polyg,astric, without ali mentary canal, without external appendages or shell ; changing their form to caudate or ecau date at pleasure; body with a single aperture.
Astasia, (1, fig. 6.) Amblyophis, (2, fig. 6.) Euglena, (3, fig. 6.) Chlorogonium, (4, fig. 6.) Colacium, (5, fig. 6.) Distigma.
Family 7 . DINOBRYINA. Animals dis tinctly or apparently polygastric ; without in testinal canal; body with a single aperture; without external appendages; changing their form at will, and invested with a shell.
Epipyxis.
Family 8. AMOEBAEAD/E ( Proteaforra Animakules). Polygastric animalcules with out alimentary canal; body with a single opening, furnished with variable processes, the shape of which changes at will ; without a shell.
Amoeba, (7, 8, 9, 10, 11, 12, 13, fig. 6.) Family 9.ARCELLINID1E. (Capsule Ani makules). Animal polygastric, anenterous, loricated ; body multiform, furnished with changeable foot-like appendages, covered with a univalve urceolate or scutellate shell, with a single aperture. = Amoeba enclosed in an urceolate or scutellate shell.
Difflugia, (1, fig. 7.) Arcella, (2, A. 7.) Cyphidium, (3, fig. 7.) Family 11. CYCLIDINIDIE ( Disk Ani makules). Animals polygastric anenterous, provided with appendages in the 'form of cilia or setx ; destitute of shell.
tyclidium.
Pantotrichum.
Chaetomonas.
Fetidly 12. PERIDINAEAD2E ( Wreath Aniznalcules). Animals visibly or probably polygastric, anenterous, loricated, vibrating ; having setm and cilia dispersed over the body or shell often in the form of a zone or crown ; shell with a single opening.
C limtotyph la.
Chmtoglena.
Peridinium.
Glenodinium.
family 13. VORTICELLINID/E (Bell ARiMakUk). Animals polykastric, having a distinct intestinal tube, with two openings, the oral and anal apertures being distinct, but situated in a depression common to both ; without shell; either solitary and free, or fixed and frequently associated, developing them selves by imperfect spontaneous division, and frequently assuming the form of beautiful little bunches.
Stentor, (fig. 8.) Trichod ina.
Urocentrum.
Vorticella, (fig. 9.) Carchesium.
Epistylis.
0 percu laria.
Zoothamnium.
Family 14. OPIIRYDINID/E ( Loricated Bell Animalcules). Polygastric animalcules, having a distinct intestinal tube, the apertures of the mouth and anus being distinct, although situated in the. same fossa ; loiicated ; solitary or aggregated. (= Vorticellina loricata.) Ophrydium, (fig. 10.) Tintinnus.
Vaginicola, (9, fig. 11.) Cothumia.
Family 15. ENCIIELIAD/E ( Rolling Animakules). Animals polygastric ; having a distinct intestinal canal, the apertures of the mouth and anus being situated at the opposite extremities of the longitudinal axis of the body; without a shell.
Enchelis, (1, 2, 3, 4, 5, fig. 11.) Disoma, (6, 7, fig. 11.) Acti nophrys.
Trichodiscus.
Podophrya.
Trichoda.
Lachrymaria, (8, fig. 11.) Leucophrys, (1, fig. 12.) IIolophrya.
Prorodon (2, fig. 12.) Family 16. COLEPINID/E ( Box Aid nzakules). Polygastric animalcules, having a distinct intestinal canal, the mouth and anus being situated at the opposite extremities of the body; loricated. = Encbeliadze furnished
with a shell.
Coleps, (1, 2, fig. 13.) Family 17. TRACHELINID/E (Neck Animalcules). Animals polygastric, furnished with a distinct intestinal canal, having an oral and an anal opening, but of these the anal opening only is terminal ; without shell.
Trachelius, (3, 4, 5, fig. 13.) Loxodes.
Bursaria.
Spirostoma.
Phialina.
Glaucoma.
Chilodon.
Nassula, (1, fig. 16.) Family 18. OPEIRYOCERCINID/E (Swan Aniincikules). Animals polygastric ; having a distinct intestinal tube, furnished with two openings, that of the mouth only being termi nal; without a shell.
Trachelocerca, (3, 4, fig. 16.) Family 19. ASPIDISCINID/E (Shield Animalcules). Polygastric, loricated, animal cules ; having an intestinal canal furnished with two orifices, of which one only, viz. the anus, is terminal.
Aspidisca.
Family 20. GOLPODEADX (Brecrst Ani malcules). Animals polygastric ; without a shell ; intestinal canal distinct, with two open ings, neither of which is terminal.
Colpoda, (2, 3,fig. 18.) Paramecium, (1, 4, fig. 18.) Amphileptus, (2, fig. 16.) Uroleptus.
Ophryoglena.
Family 21. OXYTRICH IN !D.& (Hackk Animalcules.) Animals polygastric ; without shell ; having an intestinal canal with two dis tinct orifices, neither of which is terminal; pro vided with vibrating cilia, and also with styles or uncini, which are not vibratile.
Oxytricha.
Ceratidium.
Kerona.
Urostyla.
Stylonychia.
Family 22. EUPLOTID/E. (Boat Ani malcules.) Animals polygastric, loricated; with a distinct alimentary canal having two orifices, neither being terminal. = Aspidisca with neither orifice terminal, or Oxytricha pro vided with a shell.
Discocephalus.
Chlamidodon.
Himantophorus.
Euplotes, (fig. 19.) All the above families are grouped by Ehren berg under the following orders and sections, vvhich, as it will facilitate the observations of the microscopist, as well as be a convenient guide to us in studying the economy of these little beings, we will subjoin in a tabular form, premising that the illustrious naturalist of Berlin found it advisable to separate the Poly gastria into two parallel series, one comprising all such as were destitute of a shell (NunA), the other embracing those which are furnished with such a covering (LonicArA). ANENTERA.
This includes all animalcules which possess neither an internal nutritive tube nor an anal orifice, the mouth being in communication with several nutritive vesicles. These may be divided into the following sections : 1st Section. GYMNICA.
Animalcules whose body has no external cilia nor pseudopediform prolongations.
Nuda. Loricata.
Monadina. Cryptomonadina.
Vibrio. Closterina.
2d Section. EPITRICHA.
Exterior of the body ciliated or furnished with set and without pseudopediform prolon gations.
Nuda. Loricata.
Cyclidina. Peridincea.
3d Section. SEITDOPODIA.
Body provided with variable pseudopediform prolongations.
Nuda. Loricata.
Amoeba. Bacillaria.