ZOOLOGY AND BOTANV, MICROSCOPY, ETC. 601 



which implies a knowledge of the relations between the skeleton and the 

 soft body, will be of service in reference to the architecture of Hexacti- 

 nellid sponges. In an appendix Hacker gives an account of the Phae- 

 osphreria of the " Yaldivia " and the " Gauss." 



New Hsematozoon in a Squirrel.* — J. J. Vassal describes from 

 Scuirus griseimanus from Annam a new form of Hcemammba, which 

 closely approaches Hcemamceba malaria of man. It may be that the 

 squirrel takes man's place in the life-cycle of the malaria parasite. 

 But in Vassal's experiments the Hcemamaiba from the squirrel was not 

 inoculable into man, macaque monkey, rabbit, guinea-pig, or squirrel. 



Microsporidian in Crabs. f — Ch. Perez describes the structure and 

 life-history of a new Microsporidian (Thelohania mmiadis sp. n.) which 

 infests the muscles of the shore crab {Garcinus mamas). It seems to 

 affect the nutrition of the crab, to lead to the suppression of a moult,, 

 and thus to favour the growth of epizoic organisms on the carapace. 



New Blood Parasite of Frog.J — James Stebbing, jun., describes a 

 large worm-like parasite, which he calls Karyolysus clamatw, from the 

 blood of Rana clamata. It is able to enter and leave the blood cor- 

 puscles with the greatest ease and rapidity, and always mutilates the 

 corpuscles badly in so doing. It seems to attack both the leucocytes and 

 the erythrocytes, but shows a marked preference for the latter. 



Trypanosome of Dourine.§ — A. Lingard discusses this parasite of 

 horses. A stallion or mare usually contracts the disease during coitus. 

 In the stallion the preferential sites for the development appear to be 

 the extremity of the penis and later its sheath ; in the mare the vulva 

 appears to be the usual seat. The Dourine plague — a form of nettle-rash 

 — is described, and the changes that take place in the form of the 

 trypanosome during the persistance of the plague are discussed. Flies 

 can convey the disease to healthy susceptible animals. Certain breeds 

 of horses can maintain the " materies morbi " of Dourine in their systems 

 for periods of from one to four years. 



Sexual Reproduction in Actinomyxidia.|| — M. Caullery and 

 F. Mesnil have studied the life-history of Sphmractinomyzon stolci C. et M. 

 a Protozoan parasite of marine Oligochsets, and have observed a con- 

 jugation of gametes with some degree of anisogamy. 



Trypanosoma Paddse.*" — M. Thiroux gives an account of the struc- 

 ture of this Trypanosome which Laveran discovered in Paclda oryzivora. 

 He has successfully inoculated five species of birds, but six others, 

 besides rats, mice and frogs, proved refractory. In the Padda it occurs 

 along with Halteridium damlewskyi, but the two are quite distinct, and 

 there must be a double infection. 



* Ann. Inst. Pasteur, xix. (1905) pp. 224-32. 



t P. V. Soc. Sci. Bordeaux, 1904, pp. 107-8. 



X Centralbl. Bakt. Parasitenk., xxxviii. (1905) pp. 315-18 (2 pis.). 



§ Op. cit., xxvii. (1905) pp. 537-47. 



|| Comptes Rendus, cxl. (1905) pp. 1482-4. 



«j Ann. Inst. Pasteur, xix. (1905) pp. 65-83 (2 pis.). 



