578 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
oviforme. Zscliokke and Hess had already suggested Coccidia as a very 
probable cause of the disease. It seems likely that the bare is instru- 
mental in spreading tbe disease. 
Endoglobular Parasites of Blood of Vertebrates.* — M. A. Labbe 
treats in considerable detail a subject, the beginnings of which start 
from 1870, when Prof. Kay Lankester described the Drepanidium of the 
frog’s blood. Since then Laveran and Danilewsky have worked at the 
subject. In the Batrachia, Eana esculenta is found to be infected with 
five species, belonging to the genera Drepanidium , Dactylosoma , and 
Cytameeba , of which the two latter are now for the first time diagnosed. 
Keptiles are infested by Esemogregarina lacertorum Danil., for which 
M. Labbe makes the new genus Karyolysus ; this is found in three 
sj)ecies of Lacerta, two of which are also infested by Danilewshya Lacazei 
g. et sp. n. ; D. Stepanowi is found in Cistudo europsea. Ealteridium 
g. n. has been found in Alauda arvensis, in Fringilla coelebs , in Sturnus 
vulgaris and Garrulus glandarius ; Proteosoma g. n. inhabits the blood- 
corpuscles of the first two of the just mentioned species of Birds ; Dre- 
panidium avium is provisionally allowed to stand. Man has been known 
to be troubled by Esemamoeba Laver ani. The characters and history of 
these parasites are very fully described. 
The genera are classified in two groups ; Drepanidium , Karyolysus , 
and Danilewhya being ranged as Hemosporidies, and Ealteridium , Pro- 
teosoma , Esemamoeba , Dactylosoma , and Cytamoeba as Gymnosporidies. 
The former are characterized by an intraglobular stage of growth which 
is followed by a free stage in the serum ; they have a gregariniform 
character when adult, and a coccidian endoglobular mode of reproduc- 
tion by cytocysts. The Gymnosporidia are intraglobular throughout 
life, are amoeboid when adult, and have naked reproductive spores. 
With regard to the affinities of these forms the author proposes to 
divide the class Sporozoa into the Cytozoa and Cytosporidia, which, for 
some period at least of their lives, lead an intracellular life, and the 
Histozoa or Histosporidia which are not intracellular, and live in con- 
nective, muscular, and perhaps even nervous tissues ; the relationship 
between the two divisions is not close. 
The Cytosporidia are thus arranged : 
Polycystid Gregarines Coccidium 
Klossia 
Monosporous Coccidia 
Micrococcidia 
TT I ... Acystidea 
Hsemosporiaia 
Monocystid 
Gregarines 
Halteridia 
Monosporous 
Gymnosporidia 
* Arch. Zool. Exper. et Gen., ii. (1894) pp. 55-258 (10 pis.). 
