OF CONCHOLOGY. 



331 



W. S. W. RusciiENBERGER. Two Specimens oi Spondylus Be- 



lessertit, CheQiii., from Navigator's Island. 

 Mrs. Lucy W. Say. A rayed specimen of Unio cylindricus^ 



Say, from the Wabash river. 



John Wolf. Pkurocera Letvisn, and P. suhidare, Lea, from 

 Illinois River, Canton, III.; two species oi Physa ; two species 

 of Limneidce ; Amnicola parva, Lea, A. rustica, Say, and A. 

 decisa, H;ild., from Illinois ; eleven species of Unionidce and 

 one of Sphcerium, from Canton, 111. 



The following were purchased with funds received from the 

 sale of duplicates: Cataidm hcemastoma, from India; Helix 

 Skinneri, Reeve, from Ceylon ; twenty-eight species operculate 

 land shells from West Indies, new to collection, named by Thos. 

 Bland, and six species of Cylindrella. 



A collection of one hundred and fifty-two species was sent to 

 Sylvanus Hanley for shells received from him in 1869. A sim- 

 ilar collection was sent in exchange to Dr. J. C. Cox, of Sydney, 

 N. S. W. 



Selections from the publications of the Section were sent in 

 exchange to E. A. Bielz, of Hermannstadt, F. de Malzine, of 

 Bruxelles, E. von Martens, of Berlin, M. Petit de la Saussaye, 

 of Paris, W. H. Pease, of Honolulu, Paul Terver, of Lyons, 

 and Ralph Tate. 



In consequence of the comparative completeness of our col- 

 lection in many of the families, we have been forced to decline 

 exchanging with foreign naturalists, except when they are able 

 to furnish us with specified desiderata. 



Through the liberality of Messrs. Joseph Jeanes, J. H. Red- 

 field, Wm. L. Mactier and W. S. Vaux, we have been enabled 

 to place sixty-four drawers under the horizontal cases. These 

 drawers afford accommodations for the arrangement of the fol- 

 lowing families: the Porcellanidce, OyUndrellidce^ Cydostomacea, 

 Aiiriculacea, the Helices, except the North American species, 

 the iSlugs, Vitrmce, Suceinece, and part of the Qorhlculadce. 



During the year, 10,0t>0 shells have been cleansed, oiled, 

 labelled and placed in 3771 trays. Fifty beautiful sections, 

 illustrating the genera arranged, have been prepared by Dr. F. 

 A. Hassler. 



Your Committee on the Arrangement of the Collection have 

 met frequently and devoted much time to the performance of the 

 duty assigned them. They have reason to refer with satisfaction 

 to the above summary of the results of their labors. 



All of which is respectfully submitted, 



Edward J. Nolan, Conservator. 



