380 Scientijic Proceedings of the 



Thracia named by him Thracia Conradi. It had been previously re- 

 garded as Til. corbuloides, Deshayes, and is also described and fissured by 

 Mr. Conrad as Th. declivis, of authors. From the muscular and palleal 

 impressions, the contour and surface of the shell, they were satisfied that 

 it is a new species. 



They also reported at some length on the confused synonymy of the dif- 

 ferent species of the genus Thracia, and showed that recent authors, es- 

 pecially Kiener, had increased, rather than diminished, the confusion pre- 

 viously existing. 



Rev. Mr. Greenwood reported upon several fruits from Burmah and 

 Siam, recently presented by Rev. H. Malcom. Among them were the 

 Tamarind, (Tamarindus Indica,) which is also found in the W. Indies, 

 where it is named T. occidentalis, although the differences in the two 

 hemispheres, if any, are very slight; also the Anona squamosa, the sweet 

 sop of the English, which also grows in the W. Indies. 



He also presented the fruit of the Mamea Americana, from the nut of 

 which the peculiar flavor of Noyeau is said to be derived. 



Mr. EowARD TucKERMAN, Jr., presented specimens of the Geaster 

 quadrifidus of Persoon, and read a paper upon it. He considers it a new 

 addition to the Flora of North America, as Schweinitz, the only person 

 who mentions it, says " nondum Pennsyjvaniae." It was found on the 

 sands beyond Mount Auburn, in company with G. hygrometricus. This 

 last is found on the bare sands only ; while G. A-Jidus is found in firmer 

 earth under trees. The name A-fidus is very far from specific, the number 

 of divisions into which it splits being wholly accidental. The specific 

 name, fornicatus, Hudson, is better. 



At this locality he found moVe lichens than at any other place of the 

 size, he had ever examined. The reindeer moss [Cenomyce rangiferina) 

 here grows to the length of five inches, eight inches being the usual length 

 in Lapland. A large number of species of the genera Cenomyce and Par- 

 melia are found here, some of the last genus of unusual size and lux^. 

 uriance. 



Mr. J. E. Teschemacher, presented the palatal tooth of the Ptychodus 

 polygyrus, Agassiz, an extinct species of shark. The strength and effi- 

 ciency of these teeth, viewed as instruments for crushing shells and Crus- 

 tacea, are very remarkable. The palatal teeth of this genus are very rare, 

 though the incisor or jaw teeth are common. Only a very few, and most 

 of those imperfect, are yet found in European cabinets. Mr. T. had seen 

 but two in England. 



Dr. D. H. Storer read a letter from J. G. Anthony, Esq., of Cincin- 

 nati, in which he states that in his researches among the organic remains 

 of that vicinity, Tritobites icith antenncB occur; and requests the Society 

 to cooperate in the investigation of this curious genus. The letter and 

 subject were committed to Mr. Teschemacher. 



