228 PROTOZOOLOGY 



Genus Haplozoon Dogiel. In gut of polychaetes; mature forms 

 composed of variable number of cells arranged in line or in pyra- 

 mid; salt water. Many species. 



H. clymenellae (Calkins) (Fig. 103, i, j). In Clymenella tor- 

 quata; colonial forms consist of 250 or more cells; Woods Hole. 



Genus Syndinium Chatton. In gut and body cavity of marine 

 copepods; multinucleate round cysts in gut considered as young 

 forms; multinucleate body in host body cavity with numerous 

 needle-like inclusions. 



S. turho C. (Fig. 103, h). In Paracalanus parvus, Corycaeus 

 venustus, Calanus finmarchicus ; swarmers about 15m long. 



Genus Paradinium Chatton. In body-cavity of copepods; mul- 

 tinucleate body without inclusions; swarmers formed outside the 

 host body. 



P. poucheti C. (Fig. 103, I). In the copepod, Acartia clausi; 

 swarmers about 25^1 long, amoeboid. 



Genus Ellobiopsis Caullery. Pyriform ; with stalk ; often a sep- 

 tum near stalked end; attached to anterior appendages of marine 

 copepods. 



E. chattoni C. (Fig. 103, m). Up to TOO^i long; on antennae and 

 oral appendages of Calanus finmarchicus, Pseudocalanus elongatus 

 and Acartia clausi. 



Genus Paraellobiopsis Collin. Young forms stalkless; spherical; 

 mature individuals in chain-form; on Malacostraca. 



P. coutieri C. (Fig. 103, n). On appendages of Nebalia hipes. 



Family 7 Polykrikidae Kofoid et Swezy 



2, 4, 8, or 16 individuals permanently joined in chain; individu- 

 als similar to Gymnodinium; sulcus however extending entire 

 body length; with nematocysts (Fig. 104, 6); greenish to pink; 

 nuclei about 1/2 the number of individuals; holozoic; salt water. 



Genus Polykrikos Biitschli. With the above-mentioned char- 

 acters; salt or brackish water. 



P. kofoidi (Chatton) (Fig. 104, a, h). Greenish grey to rose; 

 composed of 2, 4, 8, or IG individuals; with nematocysts; each 

 nematocyst possesses presumably a hollow thread, and discharged 

 under suitable stimulation; a binucleate colony composed of 4 in- 

 dividuals about llO/i long; off California. 



P. harnegatensis Martin. Ovate, nearly circular in cross-section, 

 slightly concave ventrally; composed of 2 individuals; constric- 



