ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 537 



Protozoa of Louisiana.* — J. C. Smith gives an account of the 

 structure and habits of various marine Protozoa as a preliminary con- 

 tribution to the fauna of this region. Several forms are recorded for 

 the first time for North America. 



Trypanosoma dimorphon in Horses.f — A. Laveran and F. Mesnil 

 discuss this new species of Trypanosoma found by J. E. Dutton and 

 J. H. Todd in horses in Gambia. It seems to be structurally quite 

 distinct from Tr. gambiense (in man) and from other forms. Mice, 

 which are immune to Tr. gambiense, are acutely infected by Tr. dimor- 

 phon, and human serum, which is ineffective as regard Tr. gambiense, 

 has an effect on Tr. dimorphon, though less than in Nagana, Surra, and 

 Caderas. There seems little doubt that Tr. dimorphon is a well-charac- 

 terised species, distinct from Tr. brucei, Tr. gambiense, and other 

 forms. 



Peculiar Parasite of the Embryos of Daphnia.J — Ch. Perez de- 

 scribes Blashdidium pcedophthorvm g. et sp. n., probably one of the 

 Haplosporidia, which is parasitic on the eggs and young embryos in 

 the brood-pouch of parthenogenetic forms of Daphnia obtusa Kurz. 

 The fertilised ova were not infected. In its adult state the parasite 

 exhibits an ellipsoidal protoplasmic body, surrounded by a delicate 

 envelope, with a huge hyaline vacuole in the centre, and with very 

 numerous nuclei round about. The plasmic cortex divides into as 

 many parts as there are nuclei, and the mature schizont has the ap- 

 pearance of a blastula with a large segmentation cavity. 



* Rep. Louisiana Gulf Biol. Station, 1003, Bull. No. 2, pp. 43-55. 

 t Comptes Kendus, cxxxviii. (1904) pp. 732-7 (7 figs.). 

 X Proc. Verb. Soc. Sci. Bordeaux, 1903, pp. 75-^6. 



* t c^»-+- 



Oct. 19th, 1904 2 p 



