THE SPOROZOA 



177 



Amoebosporidia. Eecent observations have shown, however, that these 

 processes are not pseudopodia, but are stiff outgrowths of the body, clothed 



FIG. 19. 



Doliocystis aphroditae 

 (Lank.) (par. Aphrodite 

 aculeata), a non- septate 

 Gregarine with a distinct 

 epimerite. (After Lan- 

 kester.) 



Fio. 20. 



Associations of Gonospora spfirsa, Leger, from the gut 

 of Glycera. (From Wasielewski, after Leger.) 



by cuticle (Fig. 21), so that the name Amoebosporidia rests upon a mis- 

 conception and must be abolished. The genus Pterospora is also remarkable 

 for the possession of retractile processes, resembling tentacles (Fig. 37). ', 



A curious feature of 

 Gregarines, and one which 

 has a marked influence 

 in many cases on their 

 external form and appear- 

 ance, is their tendency to 

 form associations during 

 the trophic period, a 

 peculiarity from which 

 the type-genus Gregarina 

 probably derives its name. 

 In Monocystis it has been /t. 

 seen that two individuals 



come together when full- FIO. 21. 



grown and become associ- ? ort . ion t f c ", n of a MaipigWan tubule of stops 



mngica infested by Ophryocystis schneideri, showing three 



ated to form a Cyst in individuals of the latter species (G), one of them with 



T ,1 n two nuclei, attached by stiff processes (the pseudopodia 



Common. In Other Ureg- O f Schneider) to the wall of the tubule, p, syncytial 



irinaa acannin f inn mmr protoplasm of the tubule ; c, cilia lining it. (After Leger 



armes association may nd if ageiimull er, x isoo.) 



take place at a much 



earlier stage in the development of the individual (Fig. 20). 



