610 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
like spheres, in which (8) sickle-shaped bodies develope. (9) Passage of 
these into the poison-glands, and possibly into other organs. (10) In- 
fection of principal host. 
In human malaria the young parasites of tertian and quartan fevers 
resemble the adult parasites of tropical fevers so closely as to be indis- 
tinguishable. 
The members of this group of infective Protozoa show such remark- 
able analogies in their developmental processes that what holds good for 
one almost certainly holds good for all. Hence if Halteridium forms 
vermiform bodies, it is tolerably certain that the human parasite does 
also. 
Affinities of Siedleckia nematoides.* — Dr. A. Labbe discusses the 
affinities of this peculiar organism which Messrs. Caullery and Mesnil 
found as a parasite in Scoloplos miilleri. The discoverers suggested that 
it bad affinities with Amcebidium , but this view is not shared by Dr. Labbe. 
As he has previously indicated, he holds that the Gregarines and allied 
forms illustrate a degeneration due to parasitism, and may have had a 
“ mesozoic ” origin. Their special mobility, the presence of highly de- 
veloped myophane fibres, the tendency to have partitions and two or 
three nuclei, the mitotic division following dissolution of the nuclear 
membrane, and the peculiarities of reproduction (showing in the Coccidia, 
at least, phenomena resembling fertilisation in Metazoa), are among the 
facts which led him to the somewhat remarkable conclusion above 
indicated. 
The discovery of Siedleckia appears to him to fill a gap. It is in 
many ways Gregarine-like, but it is multinucleate, and the nuclei are 
disposed in layers suggestive of epithelial structure. In short, Labbe 
suggests that Siedleckia is intermediate between Gregarines and the 
lower Mesozoa, The matter is complicated by the fact that Caullery 
and Mesnil have found in Scolojolos miilleri a new Orthonectid. 
Bull. Soc. Zool. France, xxiv. (1899) pp. 178-9. 
