Zoological Society. 469 



crenulatis ; cardine antici dentibus 5, postice 11. Long. 3; lat. 

 li; alt. 2lin. 

 Hab. Sitka, North-west America. A single specimen was dredged 

 in the harbour, from seven fathoms, sand. 

 Cab. Belcher. 



NuccLA TUMiDA. Nuc. testd ellipticd, tumidd, striatd; marginibus 

 ventralibus integerrimis ; cardine antice dentibus 6, postice 15; 

 inths leviter striatd. Long. 4^ ; lat. 2^ ; alt. 3^ lin. 

 Hab. Straits of Malacca; from seventeen fathoms, among mud. 

 Cab. Belcher. 



NucuLA MARMOREA. Nuc. tcstd elUpticd, soUduld, albidd, sulcatd ; 

 liris ad anguhim planulatis ; latere antico brevi, subacuminato ; 

 marginibus ventralibus minute crenulatis. Long, 2^ ; lat. 1 ; alt. 

 If lin. 

 Hab. Straits of Malacca ; from seventeen fathoms, in society with 

 N. tmnida. 

 Cab. Belcher. 



NucuLA DECLivis. Ntic. tcstd pat'vd, obliqui ellipticd, soliduld, epi- 

 dermide tenui, fused indutd ; latere antico brevi ; margine dorsali 

 longe inclinato, ventralibus crenulatis. Long. 2 ; lat. 1^ ; alt 1 1 lin. 



Hab. ? 



Cab. Belcher. 



A still more oblique shell than N. pisum, to which it is closely 

 allied. 



NucuLA NANA. Niic. testd minimd, trigono-ellipticd, lavigatd, ni- 

 tidd ; marginibus ventralibus minutissime crenulatis ; cardine antice 

 dentibus 5, postice 11 ; umbonibus fuscis. Long. 1 ; lat. \ ; alt. f 

 lin. 

 Hab. Cagayan, island of Mindanao, Philippines ; from twenty-five 

 fathoms, among coarse sand. 

 Cab. Cuming. 



NucuLA Belcheui. Nuc. testd politd, oblongd, sulcatd, antici 



elongatd, truncatd, angulatd ; ab umbo?ie biangulatd, tertio inter- 



medio minori ; dentibus numerosis, serierum ambarum numero sub- 



(squali ; margine ventrali subrecto. Long. 12 ; lat. 3-|-; alt. 5^ lin. 



Hab. L'Agulhas Bank, Cape of Good Hope ; dredged from a depth 



of forty to fifty-four fathoms. 



Cab. Belcher. 



NucuLA SEROTiNA. Nuc. tcstd poUtd, oblongd, suJcatd, antice elon- 

 gatd, rotundatd, ab umbone angulatd; margine dorsali antico sub' 

 prominulo ; umbonibus elevatis. Long. 6 ; lat. 2 ; alt. 3 lin. 

 Hab. Singapore ; from seven fathoms, mud. 

 Cab. Cuming. 



This closely resembles a fossil from the Sutton crag. The latter 

 is a larger shell, of somewhat different proportions, and wants the 

 rounded anterior slope of the recent species. 



NucuLA TENELLA. Nuc. tcstd oblougd, IcBvigatd, tenui, planulatd, 

 antice elongatd, rotundatd; umbonibus parvis. Long, 4| ; lat. 1^ ; 

 alt. 2i lin. 



