316 SUMMARY OF CURRENT RESEARCHES RELATING TO 



preflagellate, which produces a flagellum and elongates, and becomes 

 (2) the flagellate, which, after a growing and multiplicative phase by 

 longitudinal fission, forms (3) the resting, " encysted," post-flagellate 

 form, adapted for extra-corporeal life. The parasite shows no connexion 

 with any Vertebrate Trypanosome, nor with Leishmannia. 



Structure and Development of Babesia canis.*— A. Schuberg and 

 E. Eeichenow have studied this parasite of dog's blood. As against 

 Hartmann's proposal to rank Babesia among binucleate Flagellata, the 

 authors indicate the lack of definite proof of the occurrence of a 

 flagellate stage. Moreover, the alleged " blepharoj^last " is much more 

 like a nucleolus. There seems to be more evidence of relationship with 

 Coccidia. 



Trypanosomes of Little Owl.t — E. A. Minchin and H. M. "Woodcock 

 describe " small spindles," " medium-sized slender forms," large " blue " 

 forms, " stout spindles," and other phases of Trypanosomes in the blood 

 of Athene noctiiae, and conclude that all the different forms belong to 

 one and the same species, Trypanosoma noctuse Schaudinn. The stout 

 spindles, which were the only forms found in summer, represent a trans- 

 missive phase of the parasite, and pass into a mosquito {Culex). 



Crithidia of Sheep Ked.J — L. D. Swingle submits evidence to show 

 that Crithidia melophagia, which he found in 1909 in the alimentary 

 canal of the sheep ked {Melophagus ovinus), cannot be, as Woodcock 

 maintains, a developmental phase in the life-cycle of a sheep Try- 

 panosome. He argues against the generalization that Crithidia and 

 Herpetomonas from all blood-sucking insects are merely developmental 

 phases of some Trypanosome. 



Leucocytozoon of Guinea-pigs. § — E. H. Ross finds that minute 

 " bodies " observed by Kurloff in 1898 within the large mononuclear 

 leucocytes of guinea-pigs, are parasites, for which the name Leucocytozoon 

 colayse sp. n. is suggested. They have an intracorpuscular stage, and 

 ultimately give rise to free-swimming, spirochsete-like bodies which may 

 be gametes. 



Peculiar Schizogony in Gronyaulax.|| — C. A. Kofoid and E. Josephine 

 Rigden describe in Gonyaidax series sp. n. a unique type of asexual re- 

 production (schizogony) resulting in the formation of a linear chain in 

 which the schizonts are united in their polar regions with but slight con- 

 striction separating the successive members of the series. There is no 

 evidence of skeletal fission, but the chain is thecate. The entire theca, 

 except in polar regions of contact, is found in initial stages of formation 

 on the distal members of the series. A progressive reduction in size 

 passes from the central to the distal members. Fission thus appears to 

 progress most rapidly in distal parts of the chain, and to be followed by 



* Arbeit, k. Gesund., xxxviii. (1912) pp. 415-34 (1 pi. aud 3 figs.). 



t Quart. Journ. Micr. Sci., lvii.(1911) pp. 141-85 (2 pis. aud 1 fig.). 



X Trans. Amer. Micr. Soc, xxx. (1911) pp. 275-83. 



§ Proc. Boy. Soc, Series B, Ixxxv. (1912) pp. 67-72 (1 pi.). 



II Bull. Mus. Comp. Zool. Harvard, xxiv. (1912) pp. 335-48 (2 pis.). 



