38 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the wall-lizard. These are Trichomastix lacertce, Bodo lacertce, and 

 Trichomonas lacertce, sp. n. Trichomastix exhibits an alternation of 

 generations. There is an asexual phase where division takes place 

 amitotically, followed by an autogamous sexual generation. Here an 

 individual encysts, its nucleus divides, forming two daughter-cells, 

 perhaps sexually differentiated. After the development of two direction- 

 corpuscles, they fuse and form a new nucleus (Frischkern). The further 

 development may follow different courses, of which one is the formation 

 of a resting-cyst, which serves for fresh infection. Bodo also exhibits 

 two generations ; Trichomonas lacertm increases by longitudinal division. 

 Particulars regarding conjugation phenomena in other flagellate para- 

 sites are given. 



Trypanosome of El-debab.* — Edmond and Sergent describe the 

 parasite of El-debab, a fatal disease affecting dromedaries in North 

 Africa. The disease appears to be caused by the prick of a species of 

 gad-fly harbouring a trypanosome. The trypanosome occurs abundantly 

 in the blood of infected animals, even when the symptoms are slight or 

 absent. It has an average length of 19 /x. The centrosome is relatively 

 large, and there are a few granules scattered in the protoplasm. Multi- 

 plication is by longitudinal division. It moves by lashing, twisting 

 movements of flagellum, which do not take it out of the field of 

 observation. 



New Vorticellidse.t — E. Faure-Fremiet gives brief notes on a 

 number of new or little known species of various genera obtained in 

 the vicinity of Paris. Ecto-parasitic species are specially numerous, and 

 show adaptations to their hosts, although they can live freely on other 

 hosts for a time. 



Inter-relationships of the Sporozoa.J— Howard Crawley discusses 

 this difficult question. He agrees with Minchin that both Coccidia and 

 Hasmosporidia have arisen from common ancestors. These ancestors in 

 their turn he believes to have been derived from the Polycystidea, and 

 his conception of the inter-relationships of the Telosporidia is indicated 

 by the following scheme : 



Organ-infesting 

 Acystosporea Coccidia 



I I 



Hsemosporea Intestinal Coccidia Monocystidea 



Polycystidea 



New Species of Chloromyxum.§ — H. Joseph describes Chloromyxum 

 protei sp. n., a new Myxosporidian which occurs in multitudes, filling up 

 the canaliculi in the kidneys of Proteus. 



* Ann. Inst. Pasteur, xix. (1905) pp. 17-48. 

 t Zool. Anzeig., xxix. (1905) pp. 430-2. 

 % Amer. Naturalist, xxxix. (1905) pp. 607-24. 

 § Zool. Anzeig., xxix. (1905) pp. 450-1. 



