96 W. G. KIDEWOOD AXD H. B. FANTHAM. 



Caullery and Mesnil ^ liave recently given the generic name 

 Sche viakovella. 



The degree of importance to be attached to the mode of 

 sporulation, whether simultaneous or successive within the 

 same cyst, is for future investigations to decide ; for the 

 present, our opinion is that the production of many spores by 

 each pansporoblast instead of a few spores or a single spore, 

 a feature possessed in common by Rhinosporidium and 

 Neurosporidium, is of more importance than the former 

 feature, in which the two genera differ. 



After due consideration of the various poiuts above set 

 forth, we definitely place Neurosporidium and Rhino- 

 sporidium in the order Haplosporidia, extending the order 

 to include these forms. Further, we divide the extended 

 order Haplosporidia into two sections; (1) the Oligosporulea 

 (nom. nov.) for forms like Haplo sporidium, Bertramia 

 and Coclosporidium, in which each pansporoblast pro- 

 duces only a small number of spores or a single spore, and 

 (2), the Polysporulea (nom. nov.) for forms like Rhino- 

 sporidium and Neurosporidium, in which the pansporo- 

 blast gives rise to many spores, either successively or almost 

 simultaneously. 



Some protozoologists express doubt as to the homogeneity 

 of the Haplosporidia as a group, and not altogether Avithout 

 reason. But Ccelosporidium, Bertramia, and Haplo- 

 sporidium form a well-defined section, and we have shown 

 above the relation of Neurosporidium and Rhinospori- 

 dium to this section. The precise limits of the order Haplo- 

 sporidia are difficult to define because of the elementary 

 structure and simple developmental cycle of the organisms 

 which that order includes. 



The Haplosporidia show points of resemblance with the 

 Mycetozoa and with the Rhizopoda. The possibility, how- 

 ever, must not be overlooked that while some of the forms 

 are truly primitive, others may be spuriously so, and may 

 owe their simplicity to degradation from a higher stock, a 

 * Loc. cit., p. 156. 



