ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 771 



regains the power of infecting by direct inoculation after it has been 

 twenty-four days within the intestine of the fly. The number of days, 

 during which the virulence of the Trypanosome contained in the fly is 

 lost, roughly coincides with the time that the infected fly is incapable 

 of transmitting sleeping sickness by biting susceptible animals. There is 

 some evidence that the salivary glands of the fly are invaded by virulent 

 forms of the parasite thirty-sis days after the fly has fed upon infected 

 blood. 



Trypanosoma evansi.* — David Bruce gives a precise account of 

 the dimensions, shape, and structure of T. evansi (Steel) which causes 

 Surra in elephants, camels, horses, cattle, and dogs. He compares it in 

 detail with T. brucei, bringing out the differences between the two. 



New Coccidian from a Whelk's Kidney. f — W. J. Dak in describes 

 Merocystis Tcathse g. et sp. n., a Coccidian parasite very abundant, in the 

 form of white spherules, in the renal organ of Buccinum undatum (in all 

 the specimens examined at Port Erin). The genus is characterized by 

 the division of the zygote by septa into secondary cysts, in each of which 

 numerous spores are found. In the later stages these all lie loosely in 

 the larger cyst. The genus is referable to Leger's family Polysporo- 

 cystidaa. 



The spores are monozoic, somewhat flattened and slightly angular, 

 and the sporocyst is smooth and not bivalve. The sporogonic life-cycle 

 is the only one to be observed in the whelk. Schizogony may take place 

 in another host, or it may be absent altogether. 



Development of Sarcocystis muris.| — Rh. Erdmann discusses this 

 representative of the Sarcosporidia. The first period of the life-history 

 extends from the time of ingestion by the host to the first stage in the 

 musculature. It lasts for 28 to 30 days, and its seat is in the walls of 

 the alimentary canal, in the lymph-vessels, and in the fatty tissue. The 

 second period comprises the transition from the unicellular stage to the 

 completed sac within the muscle. In this second period there is a stage 

 of multiplication of cells, a stage in which the cells become very rich in 

 chromatin, a stage of rapid division into sporoblasts, and a stage in 

 which sickle-shaped spores are differentiated. 



Haematozoa of Australian Reptiles. § — T. Harvey Johnston and 

 J. Burton Cleland record a number of forms and describe Hsemogregarina 

 (Karyolysus) dendrophilus sp. n. from the green tree-snake, H. (K.) 

 varanicola sp. n. from the monitor lizard, H. (K.) hinulise from a skink, 

 and other un-named species from a spinifex snake. 



Life-history of Hsemogregarina stepanowi.|| — E. Reichenow has 

 studied the life-history of this parasite, and is unable to agree with 

 Siegel's account. He emphasizes its resemblance to a Coccidium. and 

 describes the asexual phases in the marsh turtle (Emys orbicularis) and 

 the sexual phases in the leech (Placobdella catenigera). 



* Proc. Eoy. Soc, Series B, lxxxiv. (1911) pp. 181-7 (1 pi.). 



f Arch. Protistenk., xxiii. (1911) pp. 145-53 (14 figs.). 



j SB. Ges. Nat. Freunde (1910) No. 9, pp. 377-87 (1 pi. and 5 figs.). 



S Proc. Linn. Soc, xxxv. (1910) pp. 677-85 (1 pi.). 



[j SB. Ges. Nat. Freunde Berlin (1910) pp. 1-4 (1 pi.). 



