11 



young female, was presented in the name of Mr. Deming 

 Jarves ; a Fish Hawk, (^Pandion huIicEtus,) in the name of 

 Mr. A. H. Ogden ; a Sand-shoal duck, (^FuUgula Labra- 

 doro,) and the skeleton of a Bald Eagle, {Halicetus leuco- 

 cephalus,) by Mr. Theodore Lyman. Seven birds were 

 received from Moses Kimball, Esq. in exchange. 



Thirty-eight volumes of the ''Dictionnaire des Sciences 

 Natu relies," were also presented in the name of Moses Kim- 

 ball, Esq. 



The tooth of a Walrus was presented by Mr. Ayres. 



Monographs by Dr. Mantell on Belemnite and Belem- 

 noteuthis, and on Pelorosaurus, were presented in the name 

 of the author. The former was referred to Mr. Bouve 

 the latter to Prof. Wyman. 



Moses H. Perley, Esq., of St. Johns, New Brunswick 

 was elected a Corresponding Member. 



The thanks of the Society were voted to Dr. Mantel 

 and Messrs. Ogden, Jarves, and Kimball for their donations 



February 5, 1851. 

 Dr. C. T. Jackson, Vice-President, in the Chair. 



Mr. W. O. Ayres continued his account of the anatomical 

 structure of Holothuridcc. 



He also read a description of a new species of Synapta 

 under the name of Synapta tenuis. 



Synapta .TENUIS Ayres. This species is characterized by 

 having the body elongated, whitish, nearly transparent ; tenta- 

 cula twelve, pinnatifid, supported by an oral circle of twelve 

 pieces, of granulated structure, some of which are pierced with 

 holes for the admission of water in respiration ; intestinal canal 

 of equal size throughout; hooks smooth, not dentate; size 

 small. 



