GANYMEDES ANASPIDIS (nOV. GEN., NOV. SP.). 155 



On Ganymedes anaspidis (nov. gen., nov. sp.), 

 a Grregarine from the digestive tract of Anas- 

 pides tasmaniae (Thompson). 



By 

 Julian N. Huxley. 



Witli Plate 11, and 5 text-figures. 



Introduction. 



In 1907 Mr. Geoffrey Smith was in Tasmania on a zoolo- 

 gical errand, his object being especially to investigate the 

 structure and development of Anaspides, the Mountain 

 Shrimp of that country. 



After his return to England, he noticed, while examining 

 his sections in detail, some curious structures in the liver, 

 which on investigation proved to be large binucleate cells, 

 obviously of parasitic origin. Turning his attention to the 

 gut, he found that it was in some cases inhabited by large 

 numbers of Gregarines of an unusual type, and surmised 

 that there was a connection between these and the non- 

 motile parasites in the liver. 



This was enough to show that Anaspides, so interestirig 

 in every detail of its structure, is no less so in regard to its 

 parasites ; and, as he had much work of his own on hand, he 

 kindly offered me the congenial task of describing this new 

 Sporozoan, at the same time providing me with all his surplus 

 specimens of Anaspides. For this, and for much help and 

 advice, I must here tender my best thanks j nor must I 



