160 



Report, satisfactorily to determine to be the Pleuronectes oblongus, 

 Mitchill, — of which the Platessa ocellaris, DeKay, is a synonym. 



Dr. Cabot exhibited the male and female Thibetian Poly- 

 plectron (P. Tibctanus.) 



The male differs from the description in the Naturalist's Library, 

 in having a crest, and in being marked with spots of black, instead 

 of undulated bands. 



Temminck's description of the female is obviously wrong, that is 

 to say, if we suppose the present specimen to be an adult. We 

 find on the ' wings and wing coverts, lanceolate, black spots, with 

 some bright reflections, instead of round, brilliant spots, as in the male. 

 Spots near tip of tail only on the outer side of shaft, instead of on 

 both sides, and surrounded with black only, without the yellowish 

 white. Length between 17 and IS inches. This bird was bought 

 in Canton, by Mr. R. B. Forbes, and presented by him to me. 



Dr. Gould read descriptions of two species of A nod on, 

 from the river Sal wen, in British Burmah, sent him by 

 Rev. F. Mason. 



A. Salweniana. T. trapezoidea, compressa, subtenui, retro 

 dilatata, postice truncata, colore picea ; supra costam umbonalem 

 radiatim plioata : umbonibus parum elevatis ; margine superiori 

 recta, compressa, ligamentum occultante, ante umbonibus excavata ; 

 utraque valva processu dentiformicardinali, uno ante altero aptante, 

 instructa ; cavitate minime profunda ; impressionibus muscularibus 

 minime impressis ; margarita sub-livida. Long. 5J ; lat. 1 J ; alt. 

 2J poll. 



Resembles small specimens of Alas, complanata, but is much 

 less ponderous. 



A. inoscularis. T. transverse oblonga, sub-ovata, solida,subven- 

 tricosa, picea : umbonibus parum elevatis ; margine supra brevi, 

 recto, ad angulum posticum rotundato, postice subtruncato ; infra 

 arcuata ; utraque valva processu cardinali crassa, dentiformi, in- 

 structa, uno ante allero aptante ; margarita albida ; impressione mus- 

 culari antico profundo. Long. 3; lat. If ; alt. 1-J poll. 



Very closely allied to A. cdentula, Say, but is a more solid shell, 

 and the cardinal apophyses are more elevated and stronger. 



