ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 461 



the daughter-schizonts at schizogony, compensatory regeneration of the 

 newly forming part of the exoskeleton occurs. Skeletons of senile 

 appearance may be removed by exuviation, plate by plate, often at the 

 time of schizogony. This exuviation makes it possible for the animal to 

 effect readjustments of specific gravity and specific surface to changing 

 conditions of flotation. 



Autotomy of the two antapicals, or of all three horns, is of widespread 

 occurrence among many species of Ceratium, especially in those from 

 deeper levels in the sea. It is caused by local resolution of the cellulose 

 wall, and is regulatory in character, preserving in the horns after 

 autotomy the proportions characteristic of the species. Autotomy assists 

 in the adjustment of specific surface, and possibly also of specific gravity 

 to changing conditions of flotation, especially as affected by tempera- 

 ture. Regeneration with or without preceding autotomy may occur in 

 all three horns. It is also regulatory, and tends to preserve the norm of 

 the species. 



Turbilina instabilis, a variety of Strombilidium gyrans.* — E. 

 Faure-Fremiet points out that the oligotrichous Infusorian described by 

 P. Enriques as Turbilina instabilis g. et sp. n., is simply a new variety of 

 Strombilidium g grans, described by Stokes in 1888, and more recently 

 by J. Roux. He makes some notes on the posterior attaching filament 

 and on the peculiar nuclear conditions. 



Hsemogregarine of Leptodactylus ocellatus.f — J. Lesage reports a 

 new species, Hcemogregarina leptodactyli, in the blood of the common 

 Argentine frog, Leptodactylus ocellatus, the counterpart of H. theileri in 

 the edible frog. 



Parasites of Drosophila confusa.J — E. Chatton and E. Alilaire find 

 in this Muscid, which frequents breweries and the like, and does not bite, 

 two Flagellate parasites, namely, Leptomonas drosophike sp. n., and 

 Trypanosoma drosophike sp. n. This is the first record of the occurrence 

 of a " true " trypanosome in a non-biting Arthropod. 



Haemogregarine in Blood of a Himalayan Lizard. § — E. A. Minchin 

 describes Hcemogregarini thomsoni sp. n., discovered by F. Wyville 

 Thomson in Agama tuberculoid, and makes some notes on its intra- 

 corpuscular and free vermicule stages. 



Solitary Encystation in Gregarines.|| — C. Schellack finds that among 

 the Eugregarines solitary encystation does not occur in the Polycystidege 

 (except in abnormal cases), but that it does frequently occur in the 

 Monocystideas, although its significance is not known. But among the 

 Schizogregarines solitary encystation is the rule in the Aggregatidas 

 during the period of schizogony. 



Influence of Salinity on Contractile Vacuole. % — Margarethe Zuelzer 

 has found that adding sea-water to the fresh-water in which Amoeba 



* C.R Soc. Biol. Paris, lxiv. (1908) pp. 428-30. 

 t Tom. cit., pp. 995-6. X Tom. cit., pp. 1004-6 (8 figs.). 



§ Proc. Zool. Soc, 1907, pp. 1098-1104 (2 pis.). 

 || Zool. Anzeig., xxxii. (1908) pp. 597-609. 

 f SB. Ges. Natur. Freunde Berlin, 1907, No. 4, pp. 90-4 (2 figs.). 



