VOL. III.] Proceedings of Societies. 277 



bons River. Strangely enough no blob are found in Yellowstone 

 Lake or River, which are alive with trout. Why it should go 

 where it apparendy could not get, and did not go where it might 

 easily have been, is indeed a mystery. Geysers occur at various 

 points near the shore of the Yellowstone Lake, where there is a 

 sudden contrast from ice cold to boiling water. Trout may be 

 caught and cooked in the same body of water, almost without stir- 

 ring from one spot. In fact, not unfrequently they swim into a 

 geyser unawares and are speedily killed. All these trout of the 

 Yellowstone Lake and River are infested with a parasite — a cestode 

 worm. It sometimes lodges in the abdominal cavity, sometimes in 

 the pyloric caeca or intestines, but most frequently in the muscles. 

 For some time we were unable to understand how it was that the 

 trout of the Yellowstone Lake were thus infested, while those of 

 Jackson Lake were not, but the explanation was at last found. The 

 California gull and white pelican are hosts of the adult form of this 

 parasite, which lives in their intestines. The eggs of the worm, when 

 voided by the birds are eaten by the trout, and developing there into 

 the larval stage burrow into the muscles of the fish. 



In an interesting stream known as Crawfish Creek no fish were 

 present, but an abundance of crawfish ( Cambarus ambellis). Grayling 

 were restricted to Firehole River and Gibbon River, which flow to- 

 gether. The temperature of the water makes a great difference in 

 the size of trout, an extremely cold temperature retarding growth, 

 and it is on this account that most of the Yellowstone trout are 

 comparatively small in size. 



MEMBERS OF THE CALIFORNIA ZOOLOGICAL CLUB. 



Mrs. Kate D. Adams, 109 Montgomery St., San Francisco. 



H. M. Anthony, 124 Oak St., San Francisco. 



Mrs. A. L. Bancroft, 1605 Frankhn St., San Francisco. 



Frank W. Bancroft, Berkeley, Cal. 



Oscar T. Baron, Fresno, Cal. 



Dr. F. E. Blaisdell, Mokelumne Hill, Cal. 



A. W. Bowman, Piedmont, Cal. 



A. W. Bowman, Jr. , Piedmont, Cal. 



Mrs. Katharine Brandegee, 819 Market St., San Francisco. 



Robert B. Brandegee, 253 W. 42d St., New York City. 



Townshend S. Brandegee, 819 Market St., San Francisco. 



