TWENTIETH ANNUAL REPORT 119 



Mori 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 



