128 



CCELENTERATA 



P. hyacinthina Steen. (Fig. 210). Medusa about 8 cm. high and 4 

 cm. wide; color reddish: Greenland; Gulf Stream; cosmopolitan. 



Pig. 210 Fig. 211 



Fig. 210Periphvlla hyacinthina, (Mayer). Fig. 211Nausithoe punctata (Mayer). 



FAMILY 2. EPHYEOPSIDAE. 



Usually 16 marginal lobes; 9 rhopalia and 8 or more tentacles: 

 3 genera and 11 species. 



1. NAUSITHOE Kolliker. Gonads 8; tentacles 8; marginal lobes 16; 

 ectoderm of bell with clusters of small crystals: 6 species. 



N. punctata Roll. (Fig. 211). Medusa 10 mm. broad and 4 mm. 

 high; marginal tentacles stiff: cosmopolitan; Gulf Stream; common. 



2. LINTTCHE Eschscholtz. Similar to 

 Nausithoe but with sac-like gastric pouches : 

 2 species. 



L. unguiculata Eschs. (Fig. 212). 

 Medusa cylindrical or thimble-shaped, 13 

 mm. high and 16 mm. wide: Gulf stream; 

 often in swarms. 



Fig. 212 Linuche unguiculata 

 (Mayer). 



ORDER 3. CUBOMEDUSAE. 



Body more or less cuboidal in form, 

 with a single interradial tentacle or a 

 group of tentacles at each of the 4 corners, 

 the bases of which are in most forms 

 expanded to form prominent flattened 



structures called pedalia; rhopalia 4, between the tentacles; 4 wide gas- 

 tric canals in which are the plate-like gonads; false velum (velarium) 

 present, which together with their energetic swimming movements gives 

 the animals the appearance of craspedote medusae: 1 family and about 

 16 species. 



