324 PROTOZOOLOGY 



forms; multinucleate body in host body cavity with numerous 

 needle-like inclusions. 



S. turbo C. (Fig. 130, k). In Paracalanus parvus, Corycaeus ven- 

 ustus, Calanus finmarchicus; swarmers about 15/x long. 



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

 tinucleate body without inclusions; swarmers formed outside the 

 host body. 



P. poucheti C. (Fig. 130, 1). In the copepod, Acartia clausi; swarm- 

 ers about 25,u long, amoeboid. 



Genus Ellobiopsis Caullery. Pyriform; with stalk; often a septum 

 near stalked end; attached to anterior appendages of marine cope- 

 pods. 



E. chattoni C. (Fig. 130, m). Up to 700/c long; on antennae and 

 oral appendages of Calanus finmarchicus, Pseudocalanus elongatus 

 and Acartia clausi. Development (Steuer, 1928). 



Genus Paraellobiopsis Collin. Young forms stalkless; spherical; 

 mature individuals in chain-form; on Malacostraca. 



P. coutieri C. (Fig. 130, n). On appendages of Nebalia bipes. 



Family 7 Polykrikidae Kofoid and Swezey 



Two, 4, 8, or 16 individuals permanently joined; individuals 

 similar to Gymnodinium; sulcus however extending entire body 

 length; with nematocysts (Fig. 132, 6); greenish to pink; nuclei 

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

 cysts (Hovasse, 1951). 



Genus Polykrikos Btitschli. With the above-mentioned characters; 

 salt or brackish water. Species (Schiller, 1928). 



P. kofoidi (Chatton) (Fig. 132, a, 6). Greenish grey to rose; com- 

 posed of 2, 4, 8, or 16 individuals; with nematocysts; each nemato- 

 cyst possesses presumably a hollow thread, and discharges under 

 suitable stimulation its content; a binucleate colony composed of 4 

 individuals about 110m long; off California. 



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

 slightly concave ventrally; composed of 2 individuals; constriction 

 slight; beaded nucleus in center; annuli descending left spiral, dis- 

 placed twice their width; sulcus ends near anterior end; cytoplasm 

 colorless, with numerous oval, yellow-brown chromatophores; nem- 

 atocysts absent; 46m by 31.5/*; in brackish water of Barnegat Bay. 



Tribe 2 Peridinioidae Poche 



The shell composed of epitheca, annulus and hypotheca, which 

 may be divided into numerous plates; body form variable. 



