SCYPIIOZOA 



129 



Family CHARYBDEIDAE. 



With llic clKiraclcrs oii' the order: 6 jifcnera. 



1. Tamoya V. Miillor. Four tentacles, with pioiniiu'rit [xnlalia; 4 

 clusters of pistric cirri: 1 S])ecies. 



. T. haplonema ¥. Miil. (Fi^-. 2i:{). Medusa 9 cm. iii^li and 5 cm. in 

 diameter; exuinl)iella covered with wart-like 

 clusters of nematocysts: Lonii: Ishnid Sound 

 to West Indies. 



2. Chiropsalmus A.^assiz. Four «;roups 

 of about 8 t(;iitacles each, each ^^roup ex- 

 tending' fiom the finders of a palmate peda- 

 lium; fiuj^er-like sacs extendinj^- into the cav- 

 ity of the bell from near the base of the 

 manubrium: 4 species. 



C. quadrumanus A<^. Medusa 10 cm. 



lina and southwards 

 shallow water. 



ol'len 



North Caro- 

 conunon in 



Fig. 2i;{- 



-Tamoya haplonema 

 (Mayer). 



Order 4. SEM^IIOSTOMEAE. 



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 Semceostomeae : 



Oi Very lonj? marj?lnal tentacles 1. Pelagiidak 



02 No lofif,' marginal tentacles. 



hi Ijonj? tentacles on subumbrella ; no marginals 2. Cyaneidak 



&2 Short marginal tentacles .'1 Ulmakidae 



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 

 a])pearing as far north as New England. 





^4S4 



WTf 



Fig. 21 4 — Pelapla cyanella 

 (Mayor). 



