190 



THE SPOROZOA 



as described above for Monocystis. The cases in which proliferation, 

 by other methods than the usual spore-formation, has been alleged, 

 are for the most part very doubtful, and, though not incredible, 

 are highly improbable for reasons already put forward in dealing 

 with Monocystis. There are, however, a few well-attested cases of 



FIG. 34. 



Spores of various Gregarines. a, 

 simple oval spore, type of Eirmocystis, 

 Sphaerocystis, etc. (Gregarinidae). b, 

 cylindrical spore, type of Echinomera, 

 Dactylophorus, Pterocephalus, etc. (Dac- 

 tylophoriduc). c, barrel-shaped spore, 

 type of Gregarina and other Grega- 

 rinidae with sporoducts. d, navicular 

 spore of Beloides (Actinocephalidae). 



e, biconical spore with spines of 

 Ancyrophora (Acanthosjwridae). f, 

 purse -shaped spore typical of 

 Stylorhynchidae. g, crescent-shaped 

 spore typical of Menosporidae. h, 

 sac -like spore of Gonospvra tere- 

 bellae (K611.). i, tailed spore of 

 Ceratospora. j, tailed spore of Uro- 

 spora synaptae, Cuen. (From 

 Wasielewski, after Leger.) 



schizogony, which is correlated in Eugregarinae, as shown by 

 Caullery and Mesnil [10], with an intracellular stage of long dura- 

 tion, and takes place during this phase of the life-history. Thus 

 in Gonospora longissima, Caull. et Mesn., from the Annelid Dodecaceria 

 concharum, the nucleus of the intracellular trophozoite multiplies 

 by division, and the body divides into six or eight merozoites 

 arranged as a "corps en barillet " (see p. 222). The merozoites 

 then separate, escape from the host -cell, and develop into the 

 intercellular sporonts. Another and similar case has been 



