ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 315 



Orleans an intracorpuscular parasite, piriform or oval, O'To /j. long 

 by • ;->-0 ' 5 fji broad. Rosettes and sporulating forms were also observed. 

 The parasite is apparently a sporozoon, whose merozoites ])enetrate the 

 blood-corpuscles, in some cases destroying and dissolving them directly ; 

 in others only after further phases of development have occurred does 

 this destruction take place. Especially important is the extraordinarily 

 marked destruction of the blood-corpuscles ; this in itself alone ex- 

 plains a part of the most important phenomena of yellow fever. 



New Protozoon Genus in Daphnia.* — E. Chatton describes from 

 the gut of Daphnia magna and D. pulex an amoeboid parasite, 

 Pansporella perphxa, g. et sp. n., whose systematic position, on account 

 of reproductive peculiarities, is at present undetermined. It may be 

 seen in living transparent examples in the anterior part of the midgut 

 between the digestive epithelium and the peritrophic membrane. 



* C.R. Soc. Biol. Paris, Ixii. (1907) pp. 42-3. 



-♦-e^a-*- 



Y 2 



