SPIROCHHTA BALBIANII AND SPIROCHATA ANODONTR. 55 
monia. However, I would crave indulgence in discussing 
these matters, as I am not a medical man. 
Then again, Prowazek (19) mentions that S. gallinarum 
may occur for a time inside a red blood-corpuscle of the fowl 
and that this character of “ Zell-parasiten ”’ is against the 
parasite being a Bacterium. Regarding intra-epithelial 
stages in 8. balbianii or 8. anodonte there is nothing 
definite, indeed, I do not think that a definite intracellular 
phase occurs in the life-cycle of these parasites. 
On the other hand, Borrel (14) in his note on the “cilia” 
and transverse division in this same species, 8. gallinarum, 
places all Spirochetes in a group of the Bacteria, which he 
styles the Spirillo-bacteria. 
Minchin (17), in his recent article on the Protozoa, con- 
siders the Spirochetes after the Trypanosomes, as “close 
allies to the Trypanosomatide.” Both families possess a 
membrane, but in the case of Spirocheetes the membrane does 
not markedly undulate as in Trypanosomes, and it is spirally 
wound. ‘The condition of the nucleus is very different in the 
two cases ; there appears to be no motile flagellum in Spiro- 
cheetes, and there is a difference in the basal granules in the 
two cases. _ These differences were, I think, emphasised by 
Schaudinn himself when he changed his views on S. zie- 
manni. 
After carefully balwasive these characteristics, I think the 
Spirocheetes are quite distinct from the Trypanosomes, show- 
ing on the whole, a less highly specialised morphology, and 
rather exhibiting morphological resemblances to the Bac- 
teria. 
A suggested New Class of the Protozoa. 
Hereafter it may be necessary to set up a new (fifth) class 
of the Protozoa for the inclusion of such organisms as the 
Spirochetes. At one time the name Spirochetacea had 
occurred to me as a possible one for such a class. This class 
would possess affinities on one hand with the Trypanosomes, 
