ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 395 



The author also deals with Proivazekella lacertse from Lacerta agilis and 

 Agama stellis, besides species of Chilomastix and Entamaha from the 

 same two hosts. J. A. T. 



Cytamoeba bacterifera in Red Blood Cells of Frog-.— R. W. 

 Hegner {Jouni. Parasitology, 1921, 7, 157-(;i, 8 fi^s.). An interest- 

 ing organism, which Labbe found in ampliibian blood and Grassi in 

 the red blood corpuscles of the tree-frog {Hyla viridis), has been 

 observed bv Hegner in the red cells of Rana damitans and R. cateshlana. 

 It is regarded as a stage in the life-cycle of a Protozoan parasite, and it 

 has living within it, either as hyper-parasites or in symbiosis, a bacillus 

 named by Laveran Bacillus krusei. J. A. T, 



New Intestinal Amoeba in Man.— C. A. Kofoid and Olive 

 SwEZY {Univ. California Pnhlications Zoolog?j, 1921, 20, 169-98, 

 5 pis., 3 figs.). Description of Councilmania lafl.euri g. et sp. n. found 

 free and encysted in the human intestine. It is carefully compared 

 with aud distinguished from Entamaba coli. The free stage has 

 hyaline pseudopodia, abruptly formed, with endoplasm full of food 

 vacuoles aud even ingested red blood corpuscles. The resting nucleus 

 has a moderately-thin zone of peripheral chromatin ; the karyosome is 

 generally excentric, often with a small lialo, in premitotic stages com- 

 posed of dispersed particles and more nearly central in position. The 

 pseudopodia are broad, rounded, usually less than the diameter of the 

 cell in width, and generally there is only one. The cysts have one, two, 

 four or eight nuclei, rarely more. There is a thick wall to the cyst, 

 triple-contoured, spheroidal, ellipsoidal or asymmetrical, less frequently 

 spherical. The nuclei of the cysts have little peripheral chromatin and 

 large, excentric or central, spheroidal, renifcm, or lobed karyosome 

 often divided into scattered particles, eight chromosomes, and an 

 intradesmose joining polar masses seen best in the first and second 

 mitoses. The cysts form a chromophile ridge from which cytoplasm 

 emerges through a pore in the cyst wall as a chromophile bud. A 

 nucleus migrates into the bud, which is detached as an amoebula. The 

 process is repeated till the cyst is emptied of nuclei. Budding may 

 occur in the intestine. The dimensions of free stages are 65 by 35 

 microns to 20-35 microns when rounded up. The spheroidal cysts are 

 16-20, rarely 8-34, microns in diameter. J. A. T. 



Plasmodial Parasite of Laminaria. — 0. Duboscq (Comptes Rendus 

 Soc. Biol., 1921, 84, 27-33, 3 figs.). A description of Labyrintlwmyxa 

 sauvageaui g. et sp. n., one of the Proteomyxa, wliich occurs as a 

 parasite in Laminaria lejolisii, in the form of fusiform bodies, small 

 amoeba?, large amoebae, small flagellates and large flagellates. Plasmodia 

 are also formed, spreading from cell to cell, sometimes in a network of 

 fusiform units united by delicate pseudopodia, sometimes in a network 

 of amoeboid units, similarly united. J. A. T. 



Survival Value of Conjugation. — L. L. Woodruff and Hope 

 Spencer {Proc. Soc. Exp. Biol, and Medicine, 1921, 18, 30;-!-4). 

 Experiments on Spathidium spathula indicate that conjugation in the 



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