No. 465.] ZVTERRELATIONSHIPS OF SPOROZOA. 611 
origin, which, for reasons that I shall give, does not appear to 
be the case. 
The class itself falls readily into two subclasses: the Telo- 
sporidia and the Neosporidia. In the former, arrived at a cer- 
tain stage of its existence, the individual divides into reproduc- 
tive elements, the spores, and ceases to exist as an individual. 
In the latter, vegetative growth and spore formation proceed 
hand in hand. Further, the Telosporidia display sexual differen- 
tiation of fully as definite a character as the mammals, while 
nothing of the sort has as yet been described for the Neo- 
sporidia. 
The division into lesser groups is as follows : — 
TELOSPORIDIA. 
Order 1, Gregarinida. 
Suborder 1, Schizogregarine. 
Suborder 2, Eugregarine. 
Tribe 1, Acephalina [Monocystidea]. 
Tribe 2, Cephalina [Polycystidea]. 
Order 2, Coccidia. 
Order 3, Hemosporidia. 
Suborder 1, Haemosporea. 
Suborder 2, Acystosporea. 
Li 
NEOSPORIDIA. 
Order 1, Myxosporidia. 
Suborder 1, Phaenocystes. 
Suborder 2, Cryptocystes. 
Order 2, Sarcosporidia. 
Order 3, Haplosporidia. 
This is Minchin’s classification, excepting the fact that I have 
included the Haplosporidia. Doflein! rates the Coccidia and 
Hzemosporidia as suborders, the two making up the order 
Coccidiomorpha. This is probably an improvement, 
1 Archiv für Protistenkunde, vol. 1, 1902. 
