SIMPLICIA. 425 



EuDORA, Per., 



Where not even suckers are visible, but wliere tlic two surfaces are 

 smootli, and without any apparent organs. 



One species is found in tlic Mediterranean — Eadora monela, 



Cuv. — about the size of a five-franc piece, and so called by the 



people. 



When these simple animals become more concave, their inferior 



surface becomes an interior one, and may be considered as a true 



stomach. They form the 



Carybdea, Per. 



Those, in which no traces of vessels can be perceived internally, 

 only differ from Hydra in size. 



We should separate from the Mcduspe, certain genera united with 

 them by Linnaeus, from insufficient affinities. 



Be ROE, MiilL, 



Where the oval or globular body is furnished with salient ribs 

 covered with filaments or a sort of lace, extending from one pole to 

 the other, and in which ramifications of vessels arc perceptible, and a 

 kind of motion resembling that of a fluid. The mouth is at one ex- 

 tremity; in those that have been examined they lead into a stomach 

 that occupies the axis of the body, and on the sides of which are two 

 organs probably analogous to those we have styled ovaries in the 

 Medusre. Such is the 



B. piieus ; Medusa pileus, Gm.; Baster, I, III, xiv, 6,7; 

 Encyc. XC, 3, 4. Body spherical and with eight ribs ; two 

 ciliated tentacula susceptible of great elongation issuing from 

 its inferior extremity*. It is very common in northern seas, 

 and even in the British channel ; the AVhale is said to feed on 



Naturalists have referred to the same genus, simple species — 



* According to Messrs. Audouin and Milne Edwards, there exists, in the axis of 

 these animals, a cavity extending from one pole to the other, and communicating ex- 

 ternally by means of an inferior opening, which may be considered as an anterior 

 mouth. In the superior third of this cavity is contained, and, as it wei-e, suspended, 

 a sort of straight and cylindrical intestinal tube, whose exterior orifice is exactly at 

 the superior pole, bearing two granular strings — the ovaries? — on each side. The 

 cavity is filled with a liquid in motion, which may be seen passing into two lateral 

 tubes, that are soon divided into four branches, and reach the surface of the body, 

 by opening into longitudinal canals which conduct the fluid into the cilia, that are 

 constantly in motion, and appear to be organs of respiration. Finally, from the 

 lateral parts of each of these eight costal canals, arise an infinity of little transverse 

 vessels and sinuses, which establish a communication between them, and dip into the 

 surrounding parenchyma. 



On each side of the spheroid, and internally, are two small masses, each of which 

 occupies the bottom of a cavity or cul-de-sac, and gives rise to a long contractile fila- 

 ment ; these two filaments issue through two circular openings, situated near the in- 

 ferior third of the body. They are afterwards divided into numerous brandies. 



t Add Berue novem-costatuSy^mg.; Bast., loc. cit., f. 5, and Encyc, XC, 2. 



The Beyoe ovum, Fab., Groenl., 362, does not seem to differ from the;)j7e«y. 

 VOL. I v. FP 



