41 



ornatis, ultimo carinato : apertura lateral!, circulari, campanula- 

 ta ; columella recta, umbilicum linearem tegente; peristomate 

 reflexo, fere continuo. 



Allied to Pupa imicarinata^ Lk., and P. iiirrita, Pfeif., but is 

 smaller, more coarsely ribbed, has a more complete aperture, 

 projecting to the left side, and is readily distinguished from either 

 of them by the projection of the aliernate ribs across the suture, 

 giving the whorls a dentate or coronated appearance. Its color- 

 ing is like that o^ Pupa cinerea. 



Cylindrella jejuna. Testa fusiformi, solidiuscula, truncata, 

 pallide cornea, fills tenuibus albis longitudinaliter lirata : anfr. 

 superstitibus ad 9 (totis ad 18) convexis, ultimo exiliter carinato ; 

 sutura bene impressa ; collo brevissimo ; apertura expansa, peri- 

 tremate albo, continuo, anfractui penultimohaud annexo. Long, 

 f , lat. y^j poll. Hah. Florida. 



This may be a form of C. lactaria, so common in Florida, and 

 which presents so many varieties, especially in the length of the 

 neck and the development of the lip. But it seems to be con- 

 stantly smaller, darker colored, more solid, and with more convex 

 whorls. The peritreme also seems never to rest on the penult 

 whorl, as is usually the case in C. lactaria. 



The President expressed his regret at his necessary ab- 

 sence from the city at the time of the Annual Meeting. 

 He gave an interesting account of his visits to the Collec- 

 tions of objects of Natural History, brought home by the 

 United States Exploring Expedition at Washington, the 

 Collection of the Academy of Natural Sciences at Philadel- 

 phia, and the Baltimore Museum. Having made an espe- 

 cial study of the fossil remains of the Mastodon giganteiis, 

 he was particularly interested in finding at Washington a 

 tooth of an individual of this species, brought from Oregon, 

 the first known to have been received from that locality. 

 In Philadelphia he saw a tooth of 31. angustidens, proba- 

 bly the identical specimen formerly exhibited in Baltimore 

 as having been found in the Miocene formation of the State 

 of Maryland, not many miles from that city. As it was a 



