ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 191 



completely, but was pursued, overtaken, recaptured, and again carried 

 away. After rive minutes it escaped again, and this time completely, so 

 that the hunter amo3ba went on its way without its meal. 



Contractile Vacuole in Amoeba.* — E. Penard describes the mode 

 of liberation of the contents of the contractile vacuole in A. terrkola. 

 It is always situated near the edge of the plasma, and never breaks till 

 its wall touches the outside pellicle. There is a transformation of the 

 pellicle substance, whereby it becomes porous, and the extrusion to 

 the outside of the contents is made manifest by the appearance outside 

 the amoeba of a minute white cloud at the point of contact. 



Structure of Radiolaria.f — Gr. H. Fowler gives some notes on the 

 structure of Gazelletta fam. Medusettida. It appears that the " shell- 

 mouth " of Planlctonetta (a related genus), i.e. a ring round the point of 

 ingestion, is in Gazelletta a shell-cap over the extra-capsular protaplasm. 

 The body-shell of Planlctonetta is not represented in Gazelletta. The 

 intrinsic shell in both appears to be the structure here termed the "shell- 

 mouth." 



Swarms of Volvox.J — Otto Zacharias reports from Schwerin an 

 extraordinary " Wasserbliite," due to Volvox minor and V. globator. 

 There were at times 680 colonies to the litre. Most of them sank deeper 

 at night, and were obviously heliotropic positively, as is well known from 

 laboratory experiments. Those found at night near the surface were 

 mostly young colonies, not yet reproductive. 



Fission in Trichonympha.§ — Anna Foa gives an account of the 

 flagellate Trklionijmpha agilis Leidy, parasitic in the intestine of Termes 

 lucifugvs. This flagellate occurs in two forms, a larger and a smaller, 

 which may be different species ; and one of the interesting results of the 

 investigation is, that the details of mitosis are different in the two. 

 Thus, in the larger form there are no distinct chromosomes in the 

 chromatin mass. 



Two Flagellate Parasites. || — Anna Foa describes, Dkercomonas 

 maris Grassi, from the mouse ; and U. intestinalis Duj., from the frog. 

 The genus Hexamitus of Dujardin must be split into Hexamitus Duj., 

 with five known species ; Dkercomonas Grassi, with two known species ; 

 and Urophagus Klebs, with two known species. 



Giant Trypanosoma in Bovine Blood.*[ — A. Lingard gives some 

 particulars of a giant trypanosoine which was found in the blood of 

 bovines inoculated with blood containing the small variety of trypano- 

 some, primarily derived from the rat. lief ore injection into bovines, the 

 small variety was passed by inoculation through the horse and donkey. 

 I b appears traceable to the soiled blood of the rat. 



* Revue Suisse Zool., xii. (1904) pp. 657-62. 

 t Quart. Journ. Micr. Sci., xlviii. (1904) pp. 4S3-S. 

 % Biol. Centralbl.. xxv. (1905) pp. 95-6. 



§ Atti R. Accad. Lincei (Rend.) xiii. (1904) pp. 618-25 (5 figs.). 

 || Tom. cit., pp. 121-30 (6 figs.). 

 H Centralbl. Bakt. Parasiteuk., \xx\. (1903) j.p. 234-8 (1 pi.). 



