580 PROCEEDINGS OF THE ACADEMY OF [Dec., 
family Partulidce. which has been published in the Manual of Con- 
ch ology. 
Very large accessions of the mollusca of Louisiana and southeastern 
Arkansas we owe to Mr. Clarence B. Moore. Mr. Stewardson Brown 
has further augmented the series from Bermuda, and the study of 
Arizona snails collected by J. H. Ferriss and the Curator has nearly 
reached completion; reports thereon are now in course of publication 
by the Academy. 
The shells collected by Mr. A. A. Hinkley in Mexico have been 
determined, and the new forms described in several papers. 
Mr. John B. Henderson, Jr., has contributed a series of Cuban shells 
collected this year, and Dr. Arnold Ortmann gave a set of western 
Pennsylvania freshwater mussels, especially valuable on account of 
the rapid destruction of the faunas of these streams by mine water. 
A large series of mollusks from Tonkin has been purchased, in order 
to afford material for comparison with those of China, Korea and 
Japan, which the Curator is working upon. 
Accessions hardly less valuable have been received from many 
correspondents of the Department, as noted in the Additions to the 
Museum. 
PI. A. Pilsbry, 
Special Curator, Dept, of Mollusca. 
REPORTS OF SECTIONS. 
Biological and Microscopical Section. 
The Section has held nine regular meetings during the year, with an 
average attendance of nine members. Ten informal meetings have 
also been held. 
The Conservator reports the donation of six boxes of slides from the 
estate of the late Dr. Henry C. Chapman. 
The work of the year consisted chiefly in the exhibition and descrip- 
tion of mounted slides and material by each member present, and in 
the exchange of specimens for mounting, among which may be 
mentioned a valuable series of about seventy rare minerals in micro- 
scopic crystals distributed by Mr. Iveeley. 
Among the papers presented are the following: “Microscopical 
Image Formation,” by Mr. F. J. Iveeley, published in the Proceedings; 
“The Hookworm Disease,” by Dr. T. S. Stewart. 
Mr. Palmer described a new form of Pinnularia which he has named 
Pinnularia socialis, found in groups of four. 
