ENTOMOSTRACA FROM ST. PAUL ISLAND, ALASKA* 
By C. Juday and R. A. Muttkowski 
The material with which this paper deals was collected by Dr. 
M. C. Marsh, of the U. S. Bureau of Fisheries, on Saint Paul 
Island, one of the Pribilof Islands, Alaska, on August 7, 1906. 
There are three bottles of the material and the labels state that 
it was obtained from Upper Ice House Lake on Saint Paul Island. 
By far the greater portion of the catch consists of the phyllopod 
Polyartemiella juday i, which proved to be not only a new species, 
but also a new genus, and which was described by Daday 1 in 
1909. There are hundreds of individuals of this form. Several 
other entomostraca are represented, two of which appear to be 
undescribed. 
CLADOCERA 
Daphnia pulex (de Geer). 
A single, immature specimen of this form was noted. 
Eurycercus glacialis Lilljeborg. 
This is the most abundant and also the largest cladoceran in 
the material. The females reach a length of 5 mm. 
Alona rectangula Sars. 
A few specimens of this form were found. 
Chydorus sphaericus (0. F. Mueller) 
There were a few specimens of this widely distributed form. 
COPEPODA 
Diaptomus shoshone var. wardi Pearse. 
Through the kindness of Professor Pearse some of the original 
material of his D. wardi has been examined. His form seems to 
* Published by permission of the U. S'. Commissioner of Fisheries. 
1 Ann. Mus. Hung-, vol. 7, 1909, p. 173, fig. 1. 
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