PROGRESS IN BIOLOGICAL INQUIRIES, 1926 559 
Work of special interest to the bureau was performed by a private 
investigator, George W. Hunter, of the University of Illinois, who 
occupied a table at the Fairport station throughout the summer. Mr. 
Hunter worked on fish parasites found in the vicinity of Fairport. 
In the course of his investigations he discovered a new species of 
tapeworm and a new species of nematode. 
In connection with the aquicultural studies of Doctor Davis and 
Mr. Lord, the station was able to conduct considerable fish-cultural 
work on warm-water game fish. The fish produced were turned over 
to the division of fish culture. 
The activities of the fisheries biological laboratory at Beaufort, 
N. C., were extended during the year. Dr. S. F. Hildebrand, the 
director, assisted by Charles Hatsel and Irving L. Towers, carried 
on experiments in diamond-back terrapin culture, the study of the 
life histories of several species of fish, and observations and experi- 
ments relative to the use of fish for controlling mosquito breeding. 
A collection of 38 species of fish was made in the vicinity of Green- 
wood, Miss., in connection with investigations pertaining to the use 
of fish for mosquito control, carried on at that place during the sum- 
mer of 1925. The fish have been identified, and a few undescribed 
forms appear to be included. The stomachs of many of the speci- 
mens have been examined for the food contents and a report on the 
collection is being prepared. 
Investigations relative to the use of fish for controlling mosquito 
breeding, carried on for a number of years, were curtailed, owing 
to the urgency of other duties. Only limited observations and ex- 
periments, concerned principally with mosquito breeding in brackish 
water, were made in the vicinity of Beaufort. 
Elmer Higgins, chief of the division of scientific inquiry, assisted 
by R. O. Smith and others, continued his investigations on the 
mullet fishery and of the Pamlico Sound fisheries from August to 
October. J. S. Gutsell continued his studies on the life history of 
the bay scallop. 
Toward the end of the year, H. R. Seiwell and R. W. Crosley were 
detailed to Beaufort to study local oyster problems. The Navy 
Department sent two investigators, Dr. A. W. Bray and Dr. J. Paul 
Visscher, to the station in the summer to continue their previous 
studies on the prevention of the fouling of ships’ bottoms. In addi- 
tion, six independent investigators availed themselves of the privi- 
leges of the laboratory. 
Prof. H. V. Wilson, of the University of North Carolina, made 
studies on the behavior of sponge cells; Dr. Bartgis McGlone, of the 
University of Pennsylvania, continued his studies of the previous 
summer on the effects of hydrogen-ion concentration on the fertiliza- 
tion of the eggs of sea urchins; Dr. Hoyt S. Hopkins, of New York . 
University, studied respiration in the tissues of mollusks; Dr. Elinor 
H. Behre, of the University of Louisiana, studied colar adaptation 
in fishes, especially in certain blennies and in a foolfish; Dr. Libbie 
H. Hyman, of the University of Chicago, worked on digestion in 
sponges; and H. Randolph Halsey, of Columbia University, made 
some studies pertaining to the fertilization of the eggs of the stone 
crab, Menippe mercenaria, and he also made studies of the effect on 
certain cytoplasmic bodies of the cell of centrifuging the eggs of 
sea urchins, 
