ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 59 



■^ith a cyst-stage. It sbow.s no hint of any connexion with a Leptomo)Hts- 

 stage, such as is intercalated in the life-cycle of Trypanosomes from the 

 blood of Vertebrates. The author would therefore establish a sub-genus 

 Ci/stotri/panosoma, in which this new form is G. mtestinalis sp. n. 



So-called Cysts of Trichomonas intestinalis.* — A. Alexeieff has 

 studied the corpuscles which have been regarded as the cysts of Tricho- 

 monas intestinalis. They occur in the intestine of man, guinea-pig, rat, 

 fowl, some amphibians, and in the horse-leech {Hsemopis sanguisuga). 

 He finds evidence of their vegetable nature : (1) a mucilaginous enve- 

 lope, recalling the capsule of ceriain Blastomycetes ; (2) the process of 

 budding ; and (3) the presence in certain secondary cysts (or spores) of 

 a germinative pore. The conclusion reached is that the so-called cysts 

 of Trichomonas intestinalis represent an Ascomycete in the vicinity of 

 yeasts, and the author proposes the name Blastocystis enterocccia g. et sp. n. 



Melanin-producing Haematozoon.f — T. Harvey Johnston describes 

 Hsemocystidium chelodinse sp. n., from the red blood-corpuscles of the 

 common Australian tortoise, Chelodina longicoUis, in which it produces 

 melanin. He contrasts it with H. simondi from the gecko, H. 

 {Plasmodium) metchnikovi from a tortoise, and other melanin-producing 

 Hfematozoa. 



Sarcocystis of the Sheep. + — A. Alexeieff gives some details regarding 

 Sarcocgstis tenella from the sheep. The envelope of the cyst is due to 

 the host, the parasite is naked, and remains always intracellular. The 

 nucleus of the spore is like that of many Protists, with this peculiarity, 

 that the karyosome is peripheral and may even be expelled from the 

 nucleus. The spore has no polar capsule. It has all the attributes of a 

 glandular element. The spores of a cyst exhibit a process of centri- 

 fugal physiological degeneracy. 



Intracellular Stage of Gregarina polymorpha.§ — Shigemi Ishii 

 discusses the intracellular developmental stages of Gregarina pohjmorpha 

 in the intestinal epithelium of the Japanese mealworm. Leger and 

 Duboscq have concluded that no intracellular stage exists in this specie?, 

 but the evidence given in this paper seems convincing. In most cases 

 the protomerite is directed towards the lumen of the intestine, which 

 suggests that the Gregarine turns round after it enters. It has been 

 believed that intra-cellular Gregarines become free by breaking through 

 the wall of the host, first projecting the rapidly growing posterior part 

 of their body into the intestinal lumen. In the present case, the fully- 

 grown intracellular Gregarines seem to fall out, anterior end first, into 

 the intestinal canal, retaining after their complete exit no connexion 

 whatever with the epithelium. 



* C.R. Soc. Biol., Ixxi. (1911) pp. 296-8 (10 figs?.). 



t Journ. and Proc. R. Soc. N.S. Wales, xliii. (1909, received 1911) pp. 97-103 

 (1 pi. and 1 fig.). 



X C.R. Soc. Biol., Ixxi. (1911) pp. 397-9. 



§ Annot. Zool. Japon., vii. (1911) pp. 279-84 1 fig.). 



