No. 497] THE BUREAU OF FISHERIES 



attempt to supply the missing or less known phases of the 

 early development of the coelenterate egg, and especially 

 that of the Hydromedusa?. 



John D. Haseman, M.A., graduate student, University 

 of Indiana.— Studies of the Reactions of the Gastropod 

 Litorina lit area to Stimuli. Experiments were eon- 

 ducted, both in the laboratory and in the field, with a 

 view to determining the conditions and stimuli which were 

 responsible for the movements of these mollusks and the 

 positions chosen by them. It is believed by the writer 

 that Mr. Haseman has already prepared for publication a 

 paper embodying the results of these studies. 



William B. Herms, A.M., Ohio Wesleyan University 

 (now fellow in zoology, Harvard University).— A Com- 

 parative Study of Palcemonetes. The habits, post-em- 

 bryonic development and other facts in the natural his- 

 tory of the common local prawn, Palcemonetes vulgaris, 

 were studied in relation to similar observations already 

 made upon the related Palcemonetes e.rilipes of Lake 

 Erie. Interesting points, both of similarity and of differ- 

 ence, were brought to light. A very close relationship 

 between the two species undoubtedly exists. Several at- 

 tempts were also made to acclimatize larva? to higher 

 and lower degrees of salinity. 



William E. Kellicott, Ph.D., professor of biology, 

 Woman's College, Baltimore.— Biometric Studies of the 

 Dog-fish (Mustelus canis). The season was spent in the 

 collection of data bearing on the general problems of 

 correlation, growth, etc., in the dog-fish. A quite com- 

 plete series of measurements, including about 30 char- 

 acters, internal as well as external, was made upon about 

 300 individuals. Dr. Kellicott is at present working 

 over these data and examining into the rate of increase 

 in weight of the brain and viscera. Some interesting 

 facts have revealed themselves, and it is believed that a 

 paper embodying these will be ready in the near future. 



