1893.] -~ Zoology. 151 
ZOOLOGY. 
The Cercaria Stage of Amphistomum,.—Dr. Albert Lang 
has completed' the life-history of Amphistomum subclavatum. The 
adult lives in the frog, the young in the small Planorbis contortus of 
Germany. He finds that the young become encysted upon the skin of 
the frog, and as this is eaten at the time of molting the young obtain 
access to the alimentary canal in that way. Lang also describes some 
points in the anatomy of the Cercaria. Especially interesting is the 
description of the excretory apparatus which cannot well be repro- 
duced without a figure. 
Fecundation of the Eggs of Clinus argentatus.—M. Fred- 
eric Gintel gives the following account of the habits of a fish known 
as Clinus argentatus during the deposition of the eggs and their fecun- 
dation by the male: 
“The extrusion of the eggs occupies about half an hour, and they 
are deposited among the branches of a clump of seaweed, after which 
the female goes away and the male comes in his turn to the alge to 
fertilize the eggs, of which he then becomes the guardian until they 
are hatched, driving away all the males and females that come near to 
the nest. If the latter, however, are gravid, he invites them to lay 
their eggs near those which he is already guarding. M. Gintel has 
seen a male fecundate successively, and to care for seven separate 
depositions by as many different females, at intervals of several days. 
—Revue Scientifique, Août, 1892. 
Preliminary Descriptions of New Fishes from the North- 
west.—In the November number of Tae Naturatisr we described 
a few of the new species collected in western Canada. We shall here 
describe in a brief way the remainder of the new species. Full descrip- 
tions as well as a general report on the collections und a comparison 
between the fish faunas of the Red River of the North, the Saskatch- 
ewan, the Missouri, the Columbia, and the Fraser River will appear 
later, the MS. of the entire report being ready for the press. 
1. Pantosteus columbianus E. & E. 
Three specimens, 92-100 mm. Boise River, Caldwell, Oregon. 
Related to P. generosus, the eye larger, the caudal longer. Head 
"Berichte Naturf. Gesell. Freiburg vi, 81, 1892. ` 
