SCYPHOZOA 



129 



FAMILY CHARYBDEIDAE. 



With the characters of the order: 6 genera. 



1. TAMOYA F. Miiller. Four tentacles, with prominent pedalia; 4 

 clusters of gastric cirri: 1 species. 



T. haplonema F. Miil. (Fig. 213). Medusa 9 cm. high and 5 cm. in 

 diameter; exumbrella covered with wart-like 

 clusters of nematocysts : Long Island Sound 

 to West Indies. 



2. CHIROPSALMUS Agassiz. Four groups 

 of about 8 tentacles each, each group ex- 

 tending from the fingers of a palmate peda- 

 lium; finger-like sacs extending into the cav- 

 ity of the bell from near the base of the 

 manubrium: 4 species. 



C. quadrumanus Ag. Medusa 10 cm. 

 high and 14 cm. in diameter: North Caro- 

 lina and southwards, often common in 

 shallow water. Fi *- 213-T^noya haplonema 



ORDER 4. SEM.EOSTOMEAE. 



Mouth quadrate, with 4 long, oral lobes, often folded and frilled; 

 marginal tentacles hollow, often very long; rhopalia marginal: 3 families. 

 Key to the families of Sem&ostomeae: 



0! Very long marginal tentacles 1. PELAGIIDAE 



O 2 No long marginal tentacles. 



&! Long tentacles on subumbrella ; no marginals .2. CYANEIDAE 



& 2 Short marginal tentacles 3. ULMABIDAE 



FAMILY 1. PELAGIIDAE. 



Large, brightly colored medusae, disc-like 

 or hemispherical in form, with wide, simple, 

 radial gastral pouches and no ring canal, and 

 very long oral lobes and marginal tentacles: 

 5 genera and 18 species. 



1. PELAGIA Peron and Lesueur. Eight ten- 

 tacles and 8 rhopalia; 16 marginal lobes; exum- 

 brella covered with warts of nettle cells; devel- 

 opment direct, no hydroid stage being present: 

 7 species. 



P. cyanella Per. and Les. (Fig. 214). Diam- 

 eter 5 cm. ; height 4 cm. : coast of Florida and the Carolinas, occasionally 

 appearing as far north as New England. 



Fig. 214 Pelagia cyanella 

 (Mayer). 



