482 ACALEPHA. 



Ei DORA, Peron. 



Even these suckers are invisible, the two surfaces being perfectly smooth 

 and without any apparent organs, One of these species, Eudora Moneta, is 

 found in the Mediterranean. It is about the size of a five franc piece, and is 

 so called by the people on the coast. 



When these simple animals become more concave, their inferior surface 

 becomes an interior one, and may be considered as a true stomach. These 

 form the CARYBDEA, Peron. 



We should also separate from the Medusa?, certain genera united with 

 them by Linnams. Such are the 



BEROE, Miiller. 



Where the body is globular, and furnished with salient ribs covered with 

 filaments resembling a sort of lace, extending from one pole to the other, and 

 in which ramifications of vessels are perceptible, and a kind of motion, 

 resembling that of a fluid. The mouth is one extremity, in those which have 

 been examined ; they lead into a stomach that occupies the axis of the body ; 

 and on the sides are two organs, probably analogous to those we have styled 

 ovaries in the Medusae. 



Near the Beroes we must also place the 



CESTUM, Lesueur. 



A very gelatinous rib, and having one margin furnished with a double row of 

 cilia. In the middle of the inferior margin is the mouth, a wide aperture 

 opening into a stomach placed transversely in the thickness of the rib, and 

 terminating by a very small anus. This animal may be compared to a 

 Calleanira with two ribs, and excessively elongated wings. 



The POBPITA and VELELLA, Lamarck, which were formerly joined with 

 the Medusje, might also constitute a small family in this order, on account of 

 the internal cartilage which supports the gelatinous substance of the body. 



ORDER II. 



HYDROSTATICA. 



THE Hydrostatic Acalepha are known by one or more bladders usually 

 filled with air, by means of which they suspend 

 themselves in their liquid element. Exces- 

 sively numerous and variously shaped appen- 

 dages, some of which probably serve as suckers, 

 and the others perhaps as ovaries, and some longer than the rest as tentacula, 



