1910.] NATURAL SCIENCES OF PHILADELPHIA. tiSo 



plateaus, Arizona, collected by Messrs. J. H. Ferriss and L. E. Daniels 

 in 1909. Mr. Clarence B. Moore and Mr. Y. Hirase have continued 

 to contribute valuable material. 



Through illness the Department was deprived of the services of 

 Mr. Vanatta 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. Vanatta 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 Coxchology 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. Vanatta 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. Pilsbrv. 



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 proceedings 

 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 



