SIMPLICIA. 425 
Evupora, Pér., 
Where not even suckers are visible, but where the two surfaces are 
smooth, and without any apparent organs. 
One species is found in the Mediterranean—Eudora moneta, 
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 
CaryBpEA, Pér. 
Those, in which no traces of vessels can be perceived internally, 
only differ from Hydra in size. 
We should separate from the Meduse, certain genera united with 
them by Linnzeus, from insufficient affinities, 
Beror, 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 are 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 
Meduse. Such is the 
B. pileus; Medusa pileus, Gm.; Baster, I, III, xiv, 6, 7; 
Encye. 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 Whale is said to feed on 
it 
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 were, 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 
cayity 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 branches. 
+ Add Beroé novem-costatus, Brug.; Bast., loc. cit., f. 5, and Encyce., XC, 2. 
The Beroé ovum, Fab., Groenl., 362, does not seem to differ from the pileus. 
VOL,IV. EF 
