380 Scientific Proceedings of the 
Thracia named by him Thracta Conradi. It had been previously re- 
garded as Th. corbulvides, Deshayes, and is also described and figured 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 T’hracia, and showed that recent authors, es- 
pecially Kiener, had increased, rather than diminished, the confusion pre- 
viously existing. 
Rev. Mr. Greenwoop 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 7". 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. Eowaro 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 Pennsylvaniz.” It was found on the 
sands beyond Mount Auburn, in company with G. hygrometricus. This 
last is found on the bare conde only; while G. 4-fidus is found in firmer 
earth under trees. The name 4-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 ound more lichens than at any other place of the 
size, he had ever examined. T'he 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. Tescnemacuer, presented the palatal tooth of the Ptychodus 
polygyrus, Agassiz, an extinct species of shark. The strength and effi- 
ciency of t deren viewed as instruments for crashing 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. 
r. D. H. Srorer read a letter from J. G. Anrnony, Esq., ‘of Cincin- 
nati, in which he states that in his researches among the organic remains 
of that vicinity, T'rilobites with antenne occur; and requests the Society 
to cooperate in the investigation of this curious genus. The letter and 
subject were committed to Mr. Teschemacher. 
