50 



GREGAEINID.E. 



3. Development. — These animals have been 

 observed to propagate by a peculiar method, to 

 which the term " conjugating process " has been, 

 it would seem, somewhat hastily and erroneously 

 applied. Two Gregarince come into contact and a 

 cyst or capsule soon forms around them both. 



Fig. II. 



GREGARiNiE and PsoRC'SPERjii.E : — a, cyst of Gregarina sce- 

 nuridis, with two cells, containing in their interior a number of 

 pseudonaviculre ; b, Gregarina Sipunculi, with two enclosed 

 cells ; c, two Gregarince scenuridis, adhering together by their 

 ends; d, Gregarina Sieholdii; e, peculiar pseudonavicula (?) 

 from abdominal cavity of Sipunculus uudus ; /, younger 

 stage of a ; g, various PsorospermicB. 



Next, certain globular vesicles are produced in the 

 interior of the C3''st, and these become ultimately 

 metamorphosed into peculiar bodies which have 

 received the name of *' pseud onaviculie" (a, e, /). 



