Zoological Society. 307 



is met with in a high northern latitude, but the num])cr of species 

 gradually diminishes towards the seas of temperate or cold climates. 

 A few of the recent species are found in a fossil state in the more 

 recent tertiary deposits, and there are some fossil species which 

 hitherto have not been noticed in a recent state. The individuality 

 of the genus has also been maintained by M. Nardo, who has called 

 it Cuspidaria. 



NeuEra rostrata, Chemnitz (sp.). 



Mya rostrata, Chem., vol. xi. p. 195. vig. C, D. ; Dillwyn, Cat. 

 vol. i. p. 45. 



Anatina longirostris, Lamarck, Hist, des An. sans Vert., ed. Des- 

 hayes, vol. vi. p. 78. 



Necera chinensis, Gray. Griffith's Ed. of Cuvier's An. Kingd., 

 Mollusca, pi. 2. f. 5. 



Necera chinensis, ibid. Index. 



Corbula rostrata, Deshayes, ed. Lamarck. Note. Hanley's species 

 of Lamarck. 



Hab. China. Cab. Cuming. 



Nejera cuspidata, Olivi (sp.). 



Tellina cuspidata, Olivi, Zool. Adriatic, p. 101. pi. 4. f. 1. 



Erycina cuspidata, Risso, Hist. Nat. des environs de Nice, t. iv. 

 p. 366. f. 170. 



Hab. As a recent shell it inhabits deep water in the Adriatic Sea ; 

 Northumberland ; also the north-west coast of Sweden. Nor can I 

 perceive any specific difference in the valve of a shell obtained from 

 eighty-four fathoms in the China Sea, the temperature below being 

 66°, and at the surface 83°, except that it is the portion of a much 

 larger shell. As a fossil it is described by Risso from ' Trinite,' and 

 also abounds in Sicily. 



Necera hyalina. N. testd magnd, diaphand, ventricosd, antice 

 rotundatd, postice subrostratd, rotundatd; valvis subfEqualihus ; 

 epidermide tenui, scabrd, indutd. Long. 1 1 ; lat. 7 ; alt. 8 lin. 



Necera hyalina, Sowerby, ined. 



Hab. China ; Mr. G. B. Sowerby. Cab. Cuming et Belcher. 



My regard for the conchological attainments of Mr. G. B. Sowerby 

 has induced me to adopt his cabinet name for this shell. 



Ne^ra elegans. A^ testd oblongd, tenui, lineis salientibus trans- 

 versis ornatd ; rostro angulato, corrugate ; valvarum margine ven- 

 trali acuto, simplici. Long. 8; lat. 4 ; alt. 4^ lin. 



Hab. New Guinea, Cliina Sea, and Singapore. On a muddy floor, 

 in from seven to eighteen fathoms. 



Cab. Belcher et Cuming. 



Necera costellata, Deshayes (sp.). 



Corbula costellata, Deshayes, Geologic de la Grece, Mollusques, 

 pi. 7. f. 1, 2, 8. 



Hab. Originally described as a fossil by Deshayes, but has been 

 subsequent!}'- obtained recent by Professor Forbes in the Adriatic Sea. 

 A pair of valves is in the collection of Mr. Cuming, purporting as 

 coming from the north-west coast of Sweden, and has the name of 

 Neara sulcata attached to them. 



X2 



