m 



the jaws from the gape, Homs, hoofs, and muzzle black. Iris 

 dark hazel. Eye mean. 



Female : as large as the malė and likę him in all material respects. 



Young : paler and mixed with gTey. 



Inhabits the precipitous and wooded mountains of the centrai 

 region of Nepal, up and down which it rushes with fearful rapidity, 

 though it does not spring or leap well ; nor is it speedy. 



The exhibition was resumed of the new species of Shells con- 

 tained in the collection formed by Rlr. Cuming on the Western 

 Coast of South America, and among the Islands of the South Paci- 

 fic Ocean. Those exhibited on the present evening consisted of 

 various species of Anatinidcs and of the Myidous genus Saxicava : 

 they were accompanied by characters by Mr. G. B. Sowerby. 



Genus Peeiploma, Schum. 



Periploma lenticularis. Per. testd ellipticd, lenticulari, eequi- 

 valvi, albd, impolitd, tenui ; epidermide tenuissimd; margine 

 dorsali anticĄ sinuatd, cum margine anticd angulum superni 

 efformante : long. 0'7, lat. 0"3, alt. O' 55 poli. 



Hab. ad Insulam Muerte dictam. 



Tlie inside of this species shines with a silvery lustre, but is not 

 iridescent. 



It was found in sandy mud at a depth of eleven fathoms. — G. B. S. 



Pebiploma pzaniuscula. Per. testd ohlongd, planiusculd, ina- 

 ąuivalvi, albicante, impolitd, tenuiusculd ; latere antico brevi, 

 subrugoso ; marginibus, anticd subdeclivi subtruncatd, dorsali 

 rectiusculd; epidermide tenui, pallescente : long. 2'4, lat. O' 8, 

 alt. 18 poli. 



Hab. ad Sanctam Elenam. 



Odd valves alone were found on the sands. 



This species bears some resemblance to Professor Schumacher's 

 Per. inaquivalvis ; it difFers, however, in shape from that species, 

 and both the valves are deeper. — G. B. S. 



Genus Anatina. 



Anatina prismatica. An. testd oblongd, subtrapeziformi, cras- 

 siusculd, opacd, lamind internd prismaticd; latere antico trun- 

 cato, hiatu tnaximo ; lamelld utriusque valvm internd subumbonali, 

 ex tuberculo ligamentifero decurrente, ramogue ligamenti cornei 

 fere parallelo, antice inclinato : long. 2"7, lat. 1'3, alt. V 8 poli. 



Hab. ad littora Oceani Polaris Meridionalis. (New South Shet- 

 land. ) 



Driven on shore after a gale. — G. B. S. 



Anatina costata. An. testd oblongd, albd, postici rostratd, 

 ^j{ji5\ antici rotundatd ; costis octo radiantibus, anticis gradatim mino- 



