59 



that region, and particularly of the habits, localities, &c., of 

 the animals of the land shells formerly sent by him, of which 

 he gave also the native names. He announced that he had 

 collected a number of species not previously seen by him. 



A letter from A. G. Salisbury, dated Syracuse, N. Y., 

 Sept. 4, 1845, accompanying specimens of sulphate of Hme, 

 was read. The specimens were described to be artificial 

 crystallizations of tiie salt of lime obtained from the cisterns 

 of salt-works, in which tlie brine, before being drawn off for 

 evaporation, is settled by the aid of steam. They adhere 

 to the sides of the cistern. The specimens themselves had 

 not arrived. 



Dr. J. Wyman read descriptions and presented drawings 

 of two species of Linguatula, which were referred to the 

 Publishing Committee. The two species described are : 



Linguatula armillata. Body cylindrical, slightly flattened 

 on its anterior face, and surrounded by about 20 distinct rings, 

 separated from each other by a wide interval. 



From the intestines of PyUion hivittata. 



L. clavata. Cylindrical, largest in its anterior fourth, dimin- 

 ishing towards the tail which is slightly dilated. Tegument with 

 indistinct annuli, not imbricated, and deficient at both extremities. 

 Anus terminal. From the lungs of a South American Boa. It 

 may prove to be Linguatula suhcylindrica of Diesing. 



A paper, by Dr. Joseph Leidy, of Philadelphia, Cor- 

 responding Member, was read On the Existence of the Sack 

 of the Dart and of the Dart in several Species of North 

 American pneumobranchiate Mollusks. It was referred to 

 the Publishing Committee. 



Dr. Leidy stated that he had recently dissected two specimens 

 of Tehennophorus caroUniensis, in which he had the good fortune 

 to discover the sack of the dart, with the contained dart. 

 The sack was found situated at the junction of the neck of the 

 oviduct ^vith the spermatheca, was about 3 lines long and 2 in 

 thickness, muscular in structure, and lined internally with mucous 



