48 ACALEPHA. 



Tribe II. Steganophthalmata. 



Stomach furnished with a mouth, through 

 which solid food is received Medusada. 



Stomach with no central orifice or mouth, 

 but absorbing nourishment through the ex- 

 tremities of long ramifying canals .... Rhizostomadce. 



Family I. Medusadje. 



Medusa (Linn.). Umb. hemispherical, with 

 many marginal tentacles ; having 8 eyes covered 

 by lobes, 4 ovaries, 4 chambers, 4 fringed arms ; 

 a central opening and 4 lateral openings. 



M. aurita. Fig. 79 ; \. 

 campanula. 

 Surirea. 



Cyanwa (Peron). Umb. depressed, scolloped; 

 appendages to the stomach in form of sacs alter- 

 nately large and small ; 4 openings ; peduncle per- 

 forated in the centre ; 4 fringed arms ; marginal 

 tentacles very numerous, inserted beneath the 

 disk. 



C. capillata. Fig. 80 ; T L. 

 Lamarckii. 



Chrysaora (Per.). Umb. hemispherical, fes- 

 tooned ; marginal tentacles more than 8 ; appen- 

 dages to the stomach sac-like, opening by a single 

 orifice in the centre of the peduncle ; 4 very long, 

 furbelowed, unfringed arms. 



C. hyoscella. 



cyclonota. Fig. 81 ; -i. 



Pelagia (Per.). Umb. sub-hemispherical or 

 globose, scolloped ; marginal tentacles 8 ; peduncle 



