ZOOLOGY AND UOTANY, MICKOSCOPY, ETC. 85 



off portions of the cytoplasm, forming 75-100 young amoebte. As 

 Scheel's account differs in some important respects from that now given, 

 it is suggested as not improbable that there may be two types of cyst in 

 A. protmo, just as has been shown to be the case in A. miauta. 



Effects of Salt Solutions on Heat Resistance of Paramecium.* — 

 R. H. Hutchison cultivated two pure lines of P. raudatum, one in a 

 medium of decided alkaline reaction, the other in a slightly acid 

 medium. Experiments with the former showed that the addition of 

 weak solutions of common salt, calcium chloride, and potassium nitrate 

 had a marked protective action, increasing the heat-resisting powers of 

 the race. So does distilled water. Individuals from the acid medium, 

 on the other hand, were adversely affected by the addition of weak 

 solutions of common salt and calcium chloride, and also by distilled 

 water. The conclusion is drawn that certain undetermined properties 

 of the medium affected the ability of the Infusorians to withstand heat. 

 The effects of continued exposure to moderately high temperatures on 

 the death temperatures were studied. Two cultures were kept in a 

 water bath, the temperature of which ranged from 22°-;-l(>° C. The 

 mean death temperature of these two strains fluctuated considerably, 

 and at times w^as about 1° above the highest mean death temperature of 

 a control culture kept in a cool room. But this increase above the 

 control was not constant, and on the whole no very decided effect was 

 produced. 



Infusorian Fauna of Lake Maggiore.f — Emile Andre reports the 

 occurrence of a large number of Infusorians from this lake, including 

 Aiioplophrya simplex sp. n. from the intestine of a large Lumbricid 

 living under the stones at the delta of the Maggia, and a pelagic form, 

 Acarophrya helense g. et sp. n., allied to Holophrya in the family Holo- 

 phryid^e, but without a nucleus and with a projecting pharynx. It may 

 be that the nucleus is in a diffuse state. The whole posterior part of 

 the cell is occupied by a large slowly pulsating contractile vacuole. 



Protozoa from Fishes. J — Thomas Bentham reports on a number of 

 Protozoa found as parasites in fishes from near CuUercoats. He 

 obtained Hsemogreyarina cotti Brurapt and Lebaillyfrom Gottas scorpius, 

 and also from CaliiohdeUa pimctata, the Cvttus leech. It seems probable 

 that schizogony occurs in the spleen of the fish, and the gamogonous 

 cycle in the gut of the leech. An infusorian of the genus Trkhodina 

 was found on the gill-rakers of the fish, and is carefully described, 

 Hffimogregarines from the mackerel and the skate are also described. 



Multiplication-Forms of Trypanosome in Body of Rat.§ — A. C. 

 Coles has found in the lung and heart blood of the Mus decumaniis 

 many of the stages described by Minchin and Thomson in the rat-flea. 

 He has seen the recurved, the pear-shaped, the coiled-up Trypanosomes 



* Journ. Exper. Zool., xix. (1915) pp. 211-24 (1 fig.). 

 t Revue Suisse Zool., xxiii.'(1915) pp. 101-8 (2 figs.). 

 X Ann. Nat. Hist., xvi. (I'JIS) pp. 381-92 (2 pis.). 

 § Parasitology, viii. (1915) pp. 1S4-9 (1 pi.). 



