256 PROTOZOOLOGY 



further division until the upper one has divided for the second time, 

 leaving several open cups; on tunicates. 



A. mycetoides C. (Fig. 109, d, e). On gill-slits of Fritillaria pel- 

 lucida. 



Genus Chytriodinium Chatton. In eggs of planktonic copepods; 

 young individuals grow at the expense of host egg and when fully 

 formed, body divides into many parts, each producing 4 swarmers. 

 Several species. 



C. parasiticum (Dogiel) (Fig. 109, /). In copepod eggs; Naples. 

 Genus Trypanodinium Chatton. In copepod eggs; swarmer-stage 



only known. 



T. ovicola C. (Fig. 109, g). Swarmers biflagellate; about 15/x long. 



Genus Duboscqella Chatton. Rounded cell with a large nucleus; 

 parasitic in Tintinnidae. One species. 



D. tintinnicola (Lohmann) (Fig. 109, h). Intracellular stage oval, 

 about 100/x in diameter with a large nucleus; swarmers biflagellate. 



Genus Haplozoon Dogiel. In gut of polychaetes; mature forms 

 composed of variable number of cells arranged in line or in pyramid; 

 salt water. Many species. 



H. clymenellae (Calkins) (Fig. 109, i, j). In Clymenella torquata; 

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



Genus Syndiniiim 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. turbo C. (Fig. 109, k). In Paracalanus parvus, Corycaeus ven- 

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



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

 tinucleate body without inclusions; swarmers formed outside the 

 host body. 



P. poucheti C. (Fig. 109, I). In the copepod, Acartia clausi; swarm- 

 ers about 25/n long, amoeboid. 



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

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

 pods. 



E. chattoni C. (Fig. 109, m). Up to 700/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. 109, n). On appendages of Nebalia hipes. 



