NATURAL SCIENCES OF PHILADELPHIA. 291 



Summichrast, Dr. Species of Cylindrella, from near Tehuan- 



tepec. 

 Yarrow, Dr. H. C. A small collection of marine shells, from 



Fort Macon, N. C. 



Forty-four species of West Indian Helices, new to the collec- 

 tion, were purchased from Mr. Thos. Bland. 



Thirty-eight species not heretofore in the collection of the 

 Academy, from the Island of Mauritius, were presented by the 

 following gentlemen: Win. S. Vaux, 13 species; Isaac Lea, 5; 

 Wm. M. Gabb, 5; Beuj. Smith Lyman, 4; S. R. Roberts, 2; Chas. 

 F. Parker, 5; and Geo. W. Tryon, Jr., 4. 



The Committee on the arrangement of the Collection have been 

 working industriously, and report that during the year the 

 arrangement of the Land and Fresh-water shells has been com- 

 pleted, as well as that of the JSferites, A T ei*etinas, Harps, Astartes, 

 Cardilas, and a portion of the Veneridse. The amount of work 

 done exceeds that of any previous year, as the following state- 

 ment will show: Number of species determined during 1872, 

 2862 ; number of labels written, 4898 ; number of specimens 

 cleaned and mounted, 19,932. The total number of species 

 determined by the Committee to date is 6893; total number of 

 labels written, 12,067; total number of specimens mounted, 

 40,873. 



Our system of exchange has been during the past year discon- 

 tinued, in consequence of the great and increasing difficulty of 

 obtaining desiderata except by purchase. This is owing to the 

 nearly complete condition of many portions of the collection. It 

 may be mentioned, as an illustration of this fact, that out of 913 

 species recently received for examination from the Island of 

 Mauritius, but thirty-eight species, reported above, could be found 

 new to the collection. 



All of which is respectftuTy submitted, 



Edward J. Nolan, Conservator. 



At an adjourned meeting held January 7, 1873, the following 

 were elected members : Chas. Macalester, Wm. B. Bement, 

 Richard H. Townsend, M.D., Wm. Logan Fox, Dr. Chas. A. 

 Siegfried, U.S.N.. and Mrs. Caroline Pennock. 



Jabez Hogg, F.L.S., was elected a Correspondent. 



