33 « 
LITERATURE 
Good lists of the publications on the trypanosomata of fishes will be found in 
the works of Laveran and Mesnil, “ Trypanosomes et Trypanosomiasis,” and of 
Mense, “ Handbuch der Tropenkrankheiten." 
The following are important papers not mentioned in these volumes:- 
1. Montel. Trypanosoma d’un poisson de Cochinchine. Comptes Rendus de 
la Societe de Biologie, T. I, 1905, p. 1016. 
2. Lebailly. Recherches sur les Hematozoaires des Teldostdens marins. These 
Fac. Med. Paris, 1906, p. 76; and Archiv. de Parasitologie, T. X, 1906. 
3. Lebailly, M.C. Trypanosoma bothi iBarbue; n. sp. Comptes Rendus de la 
Societe de Biologie, T. IX, 1905, p. 304. 
4. Hri mpt. Sur quelques especes nouvelles de Trypanosomes parasites des 
Poissons d'eau douce. Comptes Rendus de la Societe Biologie, T. LX, 27th 
Jan., 1906, page 160. 
5. Brl mpt. Mode de transmission et Evolution des Trypanosomes parasites des 
poissons. Comptes Rendus de la Society de Biologie,' 17th Jan., 1906, T. LX. 
No. 4, p. 162. 
t>. Balfolr. Second Report of the Wellcome Research Laboratories, Khartoum, 
page 197. 
A Spirochcete (Plate XXXI). 
In the blood ol the fish of December 30th a spirochaete-like 
organism was found which could be identified with no previously 
described spirochaete. 
It had a hair-like body; its length was usually 18/1; its breadth 
at the widest part was O'6/i. It was widest at one extremity 01 
towards the middle; in the latter case, the parasite tapered towards 
both ends, but one extremity was always much thicker than the 
other. The wider end was rounded, while the other end was drawn 
out to a fine and slender point. The parasite usually occurred 
singly and lay in a simple curve, forming three-quarters of the 
circumference of a circle (Plate XXXI, figs. 1 and 2). Other forros- 
coils (fig. 3 ), compound curves (figs. 4, 9-12) and spirals (figs. 5-8) 
veie seen as illustrated. The coils were always formed by the 
s ender end of the parasite. The spiral forms were long, measuring 
10m _4 2 jn, and in some of these forms there was a suggestion of 
membrane (figs. 5 and 6). The parasites were also seen in pairs 
in groups of from three to many individuals as shown in figures 
! 3 . 14-16. Ihese organisms seemed to consist of a deeply-staining 
core and a lightly-staining periplast. Many of them stained 
irregularly by modifications of Romanowsky’s method. The lighter 
stained areas (fig. 2) occurred at irregular intervals and were of 
