ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 731 



New Hsemogregarine in Mites.* — W. W. Miller describes Hepatozoon 

 perniciosum g. et sp. n., a Hseuiogregarine pathogenic for white rats. It 

 has its sexnal cycle in a mite, Selaps echidninus, one of the Gamasida?. 

 The rats become infected by scratching their skin where the mites are, 

 and then licking their paws. If the mites contain ripe sporocysts, the 

 sporozoites become free in the rat's stomach, and penetrate to the blood 

 vessels or lymph vessels of the liver. In the cells of the liver a schi- 

 zogony occurs, and the merozoites pass into the circulation and are in 

 great part taken up by leucocytes, in which they may encyst. 



Lymphangitis of Horses.f — B. Galli-Yalerio finds evidence that 

 this disease is not fungoid but due to a Protozoon, described by Rivolta 

 as Cryptococcus farciminosus. The affinities of the organism seem to 

 warrant its reference to the genus Leishmania. 



* Bull. U.S. Hygien. Lab., No. 46 (1908) 20 pis. See also Oentralbl. Bakt. 

 Parasitenk., xliv. (1909) pp. 596-7. 



t Centralbl. Bakt. Parasitenk., xliv. (1909) pp. 577-82 (1 fig.). 



