376 ACALEPHA. 
covered with laminz, and others—Foverotra, Péron—for little foss- 
ulz, which are placed round the circumference of the umbella(1). 
We might also unite under the name of 
PELAGIA, 
Those in which the mouth is prolonged into a peduncle or is di- 
vided into arms(2). 
In all these subgenera there are no lateral cavities, but in a much 
greater number of these Medusz with a simple mouth, we find, in 
the thickness of the umbella, four organs formed of a plaited mem- 
brane, which at certain seasons are filled with an opaque substance, 
and which appear to be ovaries. They are usually placed in as 
many cavities opening on the inferior surface, or on the sides of the 
pedicle, and which have been erroneously (in my opinion) taken for 
mouths, because little animals are sometimes entangled in them(3). 
Others consider them as organs of respiration(4), but that function | 
is most probably exercised by the edges of the umbella. The ten- 
tacula, whether situated on the margin of the umbella or round the 
mouth, vary, not only according to the species, but the age of the 
animal(5). 
We will unite, under the name of 
Cyanza, Cuyv. 
All the Medusz with a central mouth and four lateral ovaries. 
C. aurita; Medusa aurita, L.; Miill., Zool. Dan. LX XVI, and 
LXVII. One of the most commonly disseminated species, ac- 
quiring with age four long arms; the whole circumference of 
its umbella is finely ciliated; reddish branching vessels proceed 
from the stomach to its circumference. In the 
C. chrysaora; Med. chrysaora, Cuv., the.edges are furnished 
with long tentacula or fulyous or brown lines or spots arranged 
(1) Medusa mollicina, Forsk., XX XIII, C; Encyc:, XCV, 1, 2;—Medusa perla, 
the genus Meticertr, Péron. 
(2) Pelagia panopyra, Péron, Voy. aux Terres Aust., XXXI, 2; the Carrinnox 
and Evacona, Pér., should also be united to it. 
(S) This opinion of Baster and Miiller induced Péron to divide a portion of 
these Medusz into Monostoma and Polystoma. 
(4) Eisenh., on the Rhisostoma, &c. 
(5) See Mull., Zool. Dan., II, p. 51. 
