STRUCTURE AND LIFE-HISTORY OF COPROMONAS SUBTILIS. 115 
Nork on COPROMONAS SP., FROM THE Fmces or THE NeEwr. 
In searching through the intestinal contents of the common 
newt (Molge vulgaris) I came across a few small monads 
very clearly resembling C. subtilis. I was therefore led to 
make some culture experiments with the feces, in the manner 
adopted in the case of frogs and toads. As a result I found 
that a very similar organism exists in this situation, only 
differing from C. subtilis inits smaller size. It is possible, 
indeed, that it is the same species, which does not attain its 
full size in the faces of the newt. 
The size of this monad is approximately 7 u-10 mu in length 
by 3 u-4 win breadth. It reproduces in the feces by longi- 
tudinal division in exactly the same manner as C. subtilis. 
Conjugation and encystment have never been observed. 
In view of the fact that so little of the life-history has 
been investigated, I think it best not to bestow a specific name 
upon this animal. Nevertheless, I believe it will be found to 
be specifically distinct. 
A figure of the organism is given on PI. 5 (fig. 48). 
ZooLocicaL LABORATORY, CAMBRIDGE, 
August, 1907. 
LITERATURE. 
1. AWERINZEW, S.— Beitrige zur Kenntnis der Flagellaten,” ‘Zool. Anz.,’ 
vol. xxxi, 1907, p. 834. 
2. Brocumann, F.—‘ Kleine Mitteilungen tiber Protozoen,” ‘ Biol. Ctrbl.,’ 
vol. xiv, 1894, p. 82. 
3. BLocumany, I'.—‘“ Ueber die Kernteilung bei Euglena,” ibid.,p. 194. 
4, Brocumany, F.—‘“ Die mikroskopische Thierwelt des Sitisswassers,’’ 
‘Abt. I Protozoa,’ Hamburg, 1895. 
5. Bivscuri, O.—‘ Beitrige zur Kenntniss der Flagellaten und einiger 
verwandten Organismen,”’ ‘ Zeitschr. f. wiss. Zool.,’ vol. xxx, 1878, p. 
205. 
6. Bitscui1, O.—‘ Mastigophora’ 
des Tierreichs,’ 1883-87. 
7. Cauxins, G. N.—‘ The Phylogenetic Significance of Certain Protozoan 
Nuclei,” ‘Ann. Acad. Sci.,’ New York, vol. xi, 1898, p. 379. 
> 
in Bronn’s ‘Klassen und Ordnungen 
