456 



PROTOZOOLOGY 



the zygotes develop into naked or encapsulated sporozoites within 

 the phagocytes of the molluscan host, which when taken in by a 

 crustacean host, develop into cephaline gregarines. 



Genus Porospora Schneider. Sporozoites formed in molluscan 

 phagocytes without any protective envelope (Hatt). 



Fig. 211. a-f, Porospora gigantea (Hatt). a, a cephalin attached to 

 Homarus gut, X1250; b, gymnospores; c, d, developing sporozoites 

 in mollusc; e, sporozoites enveloped by phagocyte; f, a sporozoite, 

 X2250. g-n, Nematopsis legeri (Hatt). g, h, trophozoites in Eriphia; 

 i, associated trophozoites attached to gut-epithelium, X1250; j, gym- 

 nospores; k, gymnospores after entering molluscan body; 1, a young sporo- 

 zoite, X2250; m, cyst in mollusc with six spores; n, germination of a 

 spore in Eriphia gut, X1250. 



