GANYMEDES ANASPIDIS (nOV. GEN., NOV. SP.). 165 



parasite of Aquila. With the specific title anaspidis, 

 however, I think no one will quarrel. 



(ii) Second Trophic Phase. 



Between the two phases of trophic life no intermediate 

 stages were found, all the couples in the liver hjtving lost 

 every trace of the cytoplasmic structures of the Gregarinoid 

 form. All they possess is a thin cuticle (fig. 18), investing 

 a delicately-meshed cytoplasm. 



The nucleus, on the other hand, has increased in com- 

 plexity (fig. 18). It is large and more or less spherical. 



Text-fig. 2. 



Diagrammatic view of the cup end of a Gregarine, to show the 

 opening on one side, and the numerous vacuolar spaces in the 

 cytoplasm. 



with a thin nuclear membrane, and an achromatic network 

 in which there is very little chromatin present. The chief 

 interest lies in the nucleolus, which is peculiar in two 

 ways. First, it occupies an unusual position, right on one 

 side of the nucleus, somewhat like the lens of an eye, with a 

 considerable surface in contact with the cytoplasm — a state 

 of things not, I believe, known in any other Gregarine, 

 though Awerinzew (1) has described something similar for 

 a Myxosporidian ; and secondly, it possesses itself another 

 lens-like structure, projecting more or less into the cell- 

 body, and composed of a very pale-staining mesh work, 

 with its outer border not a smooth curve, but formed of the 

 slightly projecting parts of the component alveoli (fig. 18). 



