1910.] 
NATURAL SCIENCES OF PHILADELPHIA. 
G83 
plateaus, Arizona, collected by Messrs. J. H. Ferriss and L. E. Daniels 
in 1909. Air. Clarence B. Moore and Mr. Y. Hirase have continued 
to contribute valuable material. 
Through illness the Department was deprived of the services of 
Air. Yanatta during six months of the year, but he took advantage 
of the period of convalescence to collect an extensive and valuable 
series of the mollusks of Bermuda. Mr. Yanatta has demonstrated 
that Bermuda has a fresh-water fauna containing no less than five 
genera of mollusks. Hitherto it has been supposed that no native 
fresh-water mollusks existed there. 
Work on the Manual of Conchology has been directed to the 
Hawaiian family Achatinellidce. 
Papers have been published by the Special Curator during the year 
on the mollusks of Mexico; of the Chiricahua Mountains, Arizona; 
on land mollusks of Panama, and of Jamaica (in collaboration with 
Dr. Brown); on Haitian Oligocene fossils, etc. Mr. Yanatta has 
prepared a paper on the mollusks of Bermuda for publication in the 
Proceedings. 
The Special Curator spent three months, beginning August loth, in 
the exploration of southern New Mexico and Arizona, in company 
with Messrs. Ferriss and Daniels. The Hachita Grande, Santa Rita, 
Baboquivari, Dragoon and other mountain ranges were studied. It 
is believed that the observations made will add materially to our 
knowledge of the zoogeography of the arid southwest. The collections 
are also interesting systematically, since a large number of species 
new to science was encountered. 
Henry A. Pilsbry, 
Special Curator. 
REPORTS OF THE SECTIONS. 
Biological and Microscopical Section. 
Nine regular and eight informal meetings have been held during 
the year, with the usual attendance. The membership is the same in 
number as last year, one resignation having occurred and one new 
member being admitted. In accordance with custom, the pioceedings 
at the meetings have consisted chiefly of oral communications, in 
which each member present has shared, of microscopical studies, many 
of which have represented original work. It is to be regretted that 
