Example, Protoraedea lutea.
8. Pltoelopliyea.
Centric CliaracIer.=-Body short, cylindrical, fleshy, swollen above InorlopAysa Irellenthus.
into an aEriferenis bladder, and provided below with a variable number of gelatinous bodies, which are full, costiform, forming a single Diphydm whose anterior part has but a single cavity (Monogastric).
Genera.
1. Cucubalus.
Body provided with a large proboscidifortn exsertile sucker, with a bunch (grappe) of ovaries at its base, lodged in a large single excavation of a natatory anterior cordiform organ, receiving also the posterior, which is also cordiform and hollowed into a cavity with a posterior and sub oval orifice.
Example, Cucubalua cordiformia, the only species cited of the genus esta blished by MM. Quoy and Gaimard. Length, two lines. Differs from the other Diphydcr, in having the nucleus much less hidden and sunk in the anterior natatory body, which has moreover only one large cavity in which it is plunged ; secondly, in having the oviferous production very short ; and, lastly, in the mode of locomotion, for the animal always swims vertically.
2. Cucuilus.
Body furnished with a great exsertile proboscidiform sucker, with a bunch of ovaries at its base, lodged in a deep excavation, the only one in the anterior natatory organ,- in form of a hood, in which the posterior is inserted (s'embotte); the latter is te tragonal, and pierced behind with a rounded terminal orifice.
Example, Cucullue Doreyanue (Quoy and Gaimard). Loca lity, New Guinea.
3. Cymba (Nacelle).
Body furnished with a large oxsertilo and proboseidifonn sucker, having at its base a mass of ovariform organs, lodged in the single and rather deep cavity of a naviform natatory organ, receiving and partially hiding the posterior natatory organ, which is sagittiform, pierced behind with a rounded orifice crowned with points, and hollowed on its free border by a longitudinal gutter.
I. de Blainville remarks that he ought to observe that M. E.acluicholtz says that this genus, to which he unites the two following genera, possesses an anterior natatory organ with two cavities, and of these the natatory cavity projects in the form of a tube. M. de Blainville further observes that this genus does not differ from the Curatli, except in the form of tho natatory organs ; in fact, the disposition of the nucleus in the bottom of the single cavity into which the anterior organ is hollowed, and the penetration of the posterior organ into this same cavity are absolutely the same as in the two preceding genera, as IL do Blainville has been able to satisfy himself front the examina tion of many individuals preserved in spirit.
Body nucleiform, provided with a largo proboscidiform sucker, surrounded by an hepatic mass, haring a ,a1.1 - at its base an ovary, tion contained in a ' b single, rical excavation of an anterior, cuboid, nata tory orgam, much . larger than the pos terior one, which is Oubdides threw. tetragonal, and nearly a, natural size; b, magnified. entirely hidden in the first.
Example, CuboTdes ritreua (Quoy and Gaimard). Locality, Straits of Gibraltar.