ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 177 



Protozoa. 



Antarctic Foraminifera.* — E. Faure-Fremiet describes a collection 

 made on the second voyage of the ' Pourquoi Pas^' All the species are 

 ubiquitous, and known from all latitudes. Some are cold water forms ; 

 others are hardy forms that occur at all depths. There is no special 

 Antarctic Foraminifer fauna, nor Arctic either (Awerinzew). 



Tertian Malarial Parasites.! — J. Gr. Thomson and D. Thomson 

 have studied the growth and sporulation of the benign and malignant 

 tertian malarial parasites in the culture-tube and in the human host. 

 The cultures of the benign tertian {Plasmodium vivax) differ from those 

 of malignant tertian {P. falciparum) in that there is no tendency to 

 clumping of the parasites in the former, either before or during sporu- 

 lation. The malignant tertian is capable of producing, in maximum 

 segmentation, thirty-two spores ; the benign tertian usually produces 

 sixteen, never thirty-two, spores. The pigment collects in P. falciparum 

 into a definite circular and very compact mass, which is formed early 

 in the growth of the parasite. In P. vivax the pigment remains 

 scattered in definite granules till just before segmentation, when it 

 collects in a loose central mass. 



Trypanosome of Dourine.J — R. Blacklock and Warrington Yorke 

 have found along with typical forms of Trypanosoma equiperdum, short 

 forms sometimes with a posterior displacement of the nucleus. It seems 

 that the symptom-complex of the disease clinically known as Dourine can 

 be produced by more than one species of Trypanosome. The new form, 

 for which the name T. equi is proposed, has very little free prolongation 

 of the flagellum, and approaches T. rhodiense, whereas T. equiperdum is 

 a monomorphic parasite in which all the forms are furnished with a free 

 flagellum. 



Life-history of Karyolysus lacertae.§— E. Reichenow has followed 

 the life-history of this Hasmogregarine, which occurs in Lacerta muralis 

 and in ibs ectoparasitic mite, Liponyssus saurarum. He describes the 

 gametocytes in the intestine of the mite, the fertilization of the macro- 

 gametes, their conversion into ookinetes, the sporogony of these, and the 

 asexual multiplication. The parasites may destroy the whole nuclear 

 material of the infected blood-corpuscles, but even badly infected lizards 

 do not appear to be much the worse. The internal body or karyosome 

 of Coccidia is discussed, and regarded as physiologically comparable to 

 the nucleolus of Metazoa. 



Nematocysts and Trichocysts of Polykrikos auricularia.|| — E. 

 Faure-Fremiet has studied this curious Peridinian, and finds both 

 trichocysts and nematocysts. The trichocysts are very abundant in the 



* Bull. Soc. Zool., xxxviii. (1913) pp. 260-71 (9 figs.), 

 t Proc. Roy. Soc, Series B, lxxxvii. (1913) pp. 77-87 (1 pi.). 

 t Proc. Roy. Soc, Series B, lxxxvii. (1913) pp. 89-96 (1 pi.). 

 % Arb. k. Ges. Berlin, xlv. (1913) pp. 317-63 (3 pis. and 7 figs.). 

 || Bull. Soc Zool. France, xxxviii. (1914) pp. 289-90 (1 fig.). 



