July, 1841.] 53 



Fusus lignarius. Trochus pharaonius, T. corallinus. Cyprea 

 arenosa, Conus mitratus. From Mr. J. S. Phillips. 



Kinixis denticulata ; (Hallowell) the Land Tortoise of Li- 

 beria. From Dr. William Blanding. 



DONATIONS TO THE LIBRARY. 



Planches du Voyage dans la Basse et la Haute Egypte; Par 

 M. Denon. Folio. From Paul Beck, Esq. 



Written Communications. The following paper was read 

 from Mr. S. S. Haldeman : 



Descriptions of four species of Cyclas, three of which belong to 

 the subgenus Pisidium : and two species of Cypris. 



C. elevata. Shell orbicular, cardinal tooth prominent, lamellar 

 teeth thick ; beaks elevated ; color brownish olive. Length 0.55, 

 height 0.50 in. 



P. abruptum. Shell olivaceous or chesnut, ovate ; beaks nearly 

 terminal, whence the outline slopes rather abruptly towards the 

 ventral margin. Length 7.5, height 6. diam. 4.5 millim. Hab. 

 Elk river, Maryland. The Rev. J. H. McFarland. 



Obs. Resembles P. amnicum, but the beaks are much more 

 nearly terminal. 



P. diaphanum. Shell ovate ; elongated, much inflated, texture thin ; 

 beaks considerably removed from the centre. Color pale ochra- 

 ceous. Length 5. height 3.5, diam. 2.5 millim. Hab. Brazil? 



P. abditum. Shell small, light ochraceous, ovate, rather elevated, 



ventricose ; beaks in contract. Length 4. height 3. diam. 2. 



millim. Hab. springs in Lancaster Co. Pennsylvania. 

 Cypris agilis. Light ochraceous, height rather more than half the 



length, base subrectilinear, height T s -j millim. 



Hab. ditches in Lancaster county Pa. (a) 

 Cypris simplex. Light ochraceous, elongated, 



nearly straight, both ends nearly alike; height 



0.346 millim. Hab. springs in Lancaster 



county Pennsylvania.(i) 



