432 
H. A[. T\'OODCOCK AND G. LAPAGE. 
Goat. Crescents. Ovals. 
No. 1 . . . 
No. 2 . . . 
No. 3 . . . 
No. 4 (first time of 
examination) 
No. 4 (second time). 
No. 4 (tliird time) . 
No. o (first time) 
No. 5 (second time). 
No. 6 
Relativelv infrequent 
T eiy abundant 
T err abundant 
T ery scanty 
]\Iucb more frequent 
N umerous 
Present (see Note) 
Faii'ly numerous 
Abundant 
Abimdant. 
T ery abundant. 
Doubtful if present. 
Very abundant. 
3Iucb less numerous. 
Abundant. 
Present (see Note). 
Numerous. 
Teiy abundant. 
Note. — The fii-st thi-ee goats and the last one were killed, but in 
the case of the remaining two some of the fluid contents of the laimen 
were obtained by means of a stomach-tul^e. In the first examination 
of No. 5. only an extremely small quantity of material was obtained — 
scarcely any in fact— and this obseiwation afforded no precise indication 
of the numbers of the parasite present. 
Our atteuticii was first dii-ectecl particularly to the crescents 
because of their vigorous movements, and the fact that, in 
individuals which were moviug but little or else were at rest, 
a single, conspicuous flagellum could be seen to be attached 
to the concave side of the parasite.^ On account of this 
characteristic appearance we have given to this form the new 
generic name, Selenomastix. Before describiug the 
parasite, however, we should point out that the cresceuts, at 
all events, have been undoubtedly observed before, for in the 
existing literature we are aware of two references which 
relate to this organism ; but neither of them furnishes any 
true indication of its peculiar characters. The fir.'t record 
occurs in a short note by Certes Bull. Soc. Zool. Frauce,^ 
vol. xiv, 18S9, p. 70), on the micro-organisms in the rumen 
of ruminants. This author observed, associated with the 
ciliates, a flagellate in the form of a creseut, which assumed at 
times an S-shape, and had its flagellum inserted at the middle 
^ IVe may add that the flagellum was actually observed first by Dr. 
E. H. Ross, in a preparation which he stained rapidly by the jelly- 
method. on being made acquainted with om discovery of the parasite. 
