ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 321 



Structure of Gonyaulax triacantha.* — C. A. Kofoid describes the 

 thecal structure of this imperfectly known Peridinid. Its occurrence in 

 Alaskan waters, and the previous records of its appearance in the 

 plankton off the coasts of Norway, Iceland, Shetland, and Finland, 

 indicate that it is a boreal neritic species of wide distribution. 



Flagellates in Human Alimentary Canal.f — A. Rosenfeld reports 

 the presence of Trichomonas intestinalis in the weakly-alkaline fluid of 

 the stomach of four advanced cases of stomach cancer, in the gastric 

 juice of a non-cancerous person, and also amongst the contents of carious 

 teeth. Their presence in the intestine does not appear to have patho- 

 logical significance. 



Flagellata in Melophagus ovinus.J — C. Pfeiffer records and de- 

 monstrates the occurrence of various developmental stages of trypano- 

 some-like parasites in the gut of Melophagus ovinus from the sheep. 

 The female appears to be more markedly infected than the male, and in 

 the former, moreover, observation of the living parasites is easier. The 

 flagellates belong to the genus Herpetomonas. 



Distinctions between Species of Trypanosoma^ — R. Koch discusses 

 the difficulty of establishing secure distinctions between the different 

 species of Trypanosome. Already the number of described forms is 

 rapidly mounting up, and it is much to be desired that the specific 

 characters should be well defined. Besides T. brucei (tsetse disease), 

 T. evansi (Surra), T. equiperdum (Dourine), T. equinum (mal de Caderas), 

 T. gambiense (sleeping sickness), other forms are now engaging attention, 

 and it is uncertain how far all the named species are distinct. A new 

 species should not be established unless the essential features of the life- 

 history are known. Koch discusses in particular the relations of T. 

 brucei and T. gambiense. In the former there is a small roundish 

 blepharoplast, 1 /a in diameter ; in the latter there is a strikingly 

 large blepharoplast, 1*5 jj. in breadth and 2*5 //. in length, which lies 

 transversely to the long axis of the cell. The following measurements 

 may be useful 



Ceylonese Haematozoa.|| — Aldo Castellani and Arthur F. Willey 

 discuss (1) some free, unpigmented Gregariniform bodies observed in 

 the blood of man and birds ; (2) pigmented endoglobular parasites of a 

 Gecko, which they refer to a new genus of Hgemarnoebidse [Hcemo- 

 cystidium simondi) ; (3) a Haemogregarine (Heemogregarina nicorice sp. n.) 



* Zool. Anzeig., xxx. (1906) pp. 102-5 (1 fig.). 



t Deutsch. med. Wochenschr., xlvii. (1904). See also Centralbl. Bakt. Parasit., 

 xxxvii. (1906) p. 611. 



% Zeitschr. Hyg. Infect., 1. (1905) p. 324. See also Centralbl. Bakt. Parasit., 

 xxxvii. (1906) pp. 611-12. 



§ SB. k. Preuss. Akad. wiss. Berlin, xlv.-xlviii. (1905) pp. 958-62. 



U Quart. Journ. Micr. Sci., xlix. (1905) pp. 383-402 (1 pi.). 



June 20th, 1906 y 



