TWENTIETH ANNUAL REPORT 119 
Most of the biological laboratories of this country are open 
in summer only. A laboratory at the Aquarium would be of 
service throughout the year and the solution of problems requir- 
ing long experiment would be greatly facilitated. The Aqua- 
rium’s collector could easily secure much more material for 
special studies than is now brought in. 
Important pathological studies have long been carried on, 
based entirely on material supplied from the Aquarium. 
The Aquarium Committee, composed of prominent zoolo- 
gists, has frequently recommended that proper laboratory facili- 
ties be afforded in the building. 
Tentative plans for an outside pumping plant, and a labora- 
tory to be located above the present offices, have been made. The 
cost for both would not exceed $100,000. The plans are similar 
to those suggested by the Director in the Report of the Zoo- 
logical Society for 1909. 
Mr. John J. DeNyse, for many years employed as zoological 
collector for the Aquarium, became incapacitated for duty and 
was pensioned in December, but illness was more serious than 
was suspected and his death occurred before the close of the 
year. 
Dr. Raymond C. Osburn severed his connection with the 
Aquarium on September 30, 1915, to accept the chair of Bi- 
ology in Connecticut College at New London. Dr. Osburn had 
served as Assistant Director since 1910, in connection with his 
duties in Columbia University. His withdrawal is a distinct 
loss to the Aquarium and the Zoological Society. 
Dr. G. A. MacCallum has for several years studied the 
parasites of fishes in the Aquarium. He examined many fishes 
during the past year and has shown that most of the losses of 
specimens are attributable to parasites. A paper by Dr. Mac- 
Callum, based on these studies, and entitled, “Some New Species 
of Ectoparasitic Trematodes,” was published by the New York 
Zoological Society in Zoologica in June. It contains descriptions 
and illustrations of six new species. A similar paper has since 
been prepared and will shortly be published by the Zoological 
Society. Dr. MacCallum has been appointed pathologist to the 
Aquarium in recognition of his services to the institution. 
Mr. Chapman Grant who had been a member of the staff 
in 1910 and 1911 returned to the Aquarium in December after 
two years of service as a second lieutenant in the Fourteenth 
