Dichtlespis, Darwin (Octolasmis, J. E. Gray ; Heptalasmis, Agassiz). —Valves 5, generally appearing like 7, from each acutum being divided into two distinct segments, united at the rostral angle ; carina generally extending up between the terga, terminating down wards in an imbedded disc.. or fork, or cup. The following are the species ; —D. Wanrickii, D. Grayii, D. pellucida, D. Lowei, D. ortho yonia. The species are very rare. They have been found attached to crabs at Madeira and off Borneo, and attached to sea-snakes in the Indian Ocean.
arynaspia, Darwin.—Valves 5, approximate; scuta with their umbones in the middle of the occludent margin ; carina rectangularly bent, extending up between the terga, with the basal end simply concave. The only species is 0. celata, which was found attached in numbers to an Antipathes in Madeira, by the Rev. R. T. Lowe.
Conchoderma, Olfers (Lepas, Liunmus ; Brenta, Oken ; Malacotta and Senoclita, Schnmacher ; Otion and Cineras, Leach ; Gymnolepas, De Blainville; Famines, J. E. Gray).—Valves 2 to 5, minute, remote from each other; scuts with two or three lobes, with their nmbones in the middle of the occludent margin ; carina arched, upper and lower ends nearly alike.
C. auritarDarwin. It is the Lepel. aurita, Linmeus ; Otion Curieramaa, 0. Blainvillianua, 0. Belli anus, '0. Dumerillianus, 0.
ksoan us, Leach ; 0. depresact, 0. aaccut Vera, Coates; 0. a uritus, Macgillivray; Lepas Seperina, Poll; Lepas ornate, Montagu ; Conchodernia au rituns, C. leporinum, Olfers; Brenta aurae, Oken ; Male cotta biralris, Schumacher ; Gymnolepas Curicri, De Blain ville.
The capitulum has two ear-like appendages seated behind the rudimentary and often absent terga ; scuta bi lobed ; carina absent or quite rudimentary ; peduncle long, distinctly separated from the capitulum. This species is extremely common in every ocean. It is found on ships' bottoms from all parts of the world. It is found in the Arctic and Antarctic Oceans, not unfrequently on the coronulw on whales, and on slow-moving fish. It is often associated with other species. The oarlike appendages are the most extraordinary part of this animal. Mr. Darwin thinks that their function is respiratory.
C. virgata, Darwin. It is the C. virgatum, Olfers ; .Lepas virgata, Spengler ; L. coriacea, Poll; L. menibranacea, Montagu ; Brenta
virgata, Oken ; Senoclita fasoiata, Schumacher ; Cineras vittata, Leach ; C. membranacea, Macgillivray ; C. bicolor, C. vittatua, Brown ; Gymno tepas Cranchii, De Blainville; Pamina trilineata, J. E. Gray. The scuta 3-lobed ; terga concave internally, with their apices slightly curved inwards ; canna moderately developed, slightly curved ; peduncle blending into the capitulum.
The small valves in C. aurita were overlooked by Lamarck, but detected by Leach. In the Museum of the Royal College of Surgeons, 'Nat. Hist.,' No. 265, there is a species named Cineras Hunteri, of which two small groups are attached to the tail of Hydrophia bicolor, which is figured in Russell's Indian Serpents,' 1, tab. xli., and is called by the natives • Nalla Wahlagillee Pam.' Russell says, " This sea-snake, according to the Vizagapatam fishermen, seldom approaches the shore ; several of them had never seen one before. They pre tended it was of a very dangerous kind, which is contradicted by the want of poisonous organs." C. Hunteri is admitted as a species by Mr. Darwin. It has however scarcely more claim to be regarded as a species than some of the varieties of the first two species.
Alepas, Sander Rang (Anatifa, Quoy and Gairnard ; Triton, Lesson ; Cineras, Lesson).—Capitulum without valves, or with horny almost hidden scuta.
M. Rang has given the generic appellation above stated to the Cinema parasite of Lesson, and the Anatifa univalvis of Quoy and Gaimard. The species on which the genus was founded was detected attached to the umbrella of a Medusa. Rang considers this to be the Triton of Linnmus. Cuvier, in the last edition of the • Regne Animal,' observes that he has not seen the species, but still adheres to his old opinion ; for he says that it ought not in any case to be confounded with the Triton of Linnmus, which was the animal of an Anal& torn from its mantle and shell.
A. parasite, Sander Rang. It is the Anatifa univalvis and A. para site, Quoy and Gaimard ; Triton (Alepas) fascicu talus, Lesson. Orifice not protuberant, equalling two-thirds of the length of the capitulum; scuta horny. Total length two inches.
It has been found parasitic on Medusee in the Mediterranean and Atlantic oceans and on the south shore of England.