414 ACALEPHA. CASSIOFEA. 



posed on their lower surface, or by simple pores. The genus Cephea of Peron is 



only distinguished from the present by having filaments mixed with the dentations 



of the pedicle. 



R. cyanea, Cuv. Of a bluish or purplish colour, and sometimes two 

 feet in breadth ; pedicle divided into eight dichotomous and den- 

 tated arms, each furnished at their base with two dentated auri- 

 cles ; circumference with a fine net-work of vessels around 



Cuv. Reg. An. iv. 57- 



Gen. 9- CASSIOPEA, Cuv. Medusa, Pallas. 

 Body orbicular, transparent, furnished with arms below; pe- 

 duncle short, with eight arms, and sometimes smaller ones ; 

 destitute of tentacula at the circumference ; eight cavities be- 

 low. 



C.jrondosa, Cuv. Body orbicular, flattened; margin ten-lobed; 

 ten branched arms. Inhabits West Indian seas. Lam. ii. 512. 



Gen. 10. GERYONTA, Cuv. Medusa, Forsk. 

 Body hemispherical, with a peduncle furnished on each side 

 with filaments, which appear to serve as suckers, or with a 

 membrane like a funnel at the end of the peduncle. 



This genus includes the genera Limnorea, Geryonia, and Favonia of heron. 

 G. proboscidalis, Cuv. Hemispherical ; margin with six long tenta- 

 cula ; peduncle long, in the form of a proboscis, with the extre- 

 mity of the margin plicated. Mediterranean sea Lam. ii. 505. 



Gen. 11. ORYTHIA, Peron. Medusa, Bast. 

 Body orbicular, transparent; peduncle long, but destitute of 

 the terminal membrane. 



O. minima, Peron. Body depressed, discoidal, with eight spots ; 

 peduncle naked. Inhabits European coasts. Lam. ii. 503. 



Gen. 12. BERENIX, Peron. 



Body orbicular, without peduncle, but the under part of the 

 body furnished with small suckers. 



B. carisochroma, Cuv. Voyage aux Terres Aust. pi. 30, fig. 2. 



Gen. 18. EIIDORA, Peron. 



Body free, orbicular, discoid, without arms, peduncle, or tenta- 

 cula ; mouth inferior and central. 



E. undulosa, Peron. Body orbicular, flattened, discoidal, naked, ra- 

 diated above by simple vessels, undulated, with diverging poly- 

 chotomous vessels below. Lam. ii. 493. 



Gen. 14. CAKYBDEA, Peron. 



Body orbicular, convex or conoid above, concave below, without 

 arms, peduncle, or tentacula, but with lobes at the margin. 



C. marsupialis, Peron. Body conoidal, margin lobed, with four dis- 

 tant lines. Inhabits Mediterranean sea. Lam. ii. 496. 



