1896.] NATURAL SCIENCES OF PHILADELPHIA. 581 



and work tables will be at the disposal of the members, and it is 

 hoped will be used for scientific investigation. 

 The oflicers of the Section are as follows : — 



Director, 

 Vice- Director, 

 Treasurer, 

 Conservator, . 

 Corresponding Secretary, 

 Recorder, 



J. Cheston Morris, M. D. 



John C. Wilson, 



Chas. P. Perot. 



F. J. Keely. 



John G. Rothermel. 



M. V. Ball. 



M. V. Ball, 



Recorder. 



REPORT OF THE CONCHOLOGICAL SECTION. 



The arrangement of the conchological collection remains substan- 

 tially as reported last year, want of space preventing the progress 

 of the systematic rearrangement in the exhibition cases of the families 

 of mollusks studied and relabelled during the year, in connection 

 with the monographic work in the Manual of Conchology. The 

 remainder of the Tectibranch gastropods, including the Aplysiidce, 

 Pleurohranchidce and Umbraculidce, and of the land mollusks a 

 considerable Tpavt of the Bulimulidce, have been revised and prepared 

 for arrangement in the cases. The genus Cerion has been studied 

 by Mr. Vanatta and the Conservator, and the collection relabelled 

 and arranged according to a complete catalogue of the species pub- 

 lished in the Proceedings of the Academy. It is gratifying to state 

 that out of seventy described species of Cerion we are in possession 

 of all but seven, and have extensive series of most of the species. 



A portion of the American Slugs have been studied, and large 

 additions to the collection made ; partial results being given in a 

 paper published by the Academy, the greater part of this work be- 

 ing due to Mr. Vanatta's industry. 



A considerable collection of mollusks from Uruguay and adjacent 

 regions has been received from Dr. Wm. H. Rush, U. S. N., com- 

 prising many species new to the collection, and about twenty new to 

 science. 



A valuable collection of Alaskan mollusks, made by Dr. Benj. 

 Sharp, has been presented to the Academy, but not yet wholly de- 

 termined. The remainder of Prof. Heilpriu's Bermuda collection 

 has been placed in the cases, and with what we already had, forms 



