NUCULA.— Plate IV. 



/ 



Thk divergent Nucula. Shell elliptical, compressed, 

 sculptured with ridges diverging from the centre; 

 posterior side oblong, dorsal area compressed, end 

 rounded ; anterior side acuminated, a little pro- 

 duced, lunular margin excavately depressed. 



Hinds. Proc. Zool. Soc, 1843, p. 97. 



Hah. Chinese Seas. 



In sculptm-e resembling Nucula mirabilis, but more 

 cuneate, with the anterior end more produced and 



Species 30. (Mus. Belcher.) 



Nucula marmorea. Nuc. testd elliplicd, soliduld, 

 albidd, sidcatd, marmoratd ; liris ad angulum pla- 

 nulatis ; latere post ico brevi, subacuminato,margine 

 ventrali mimite crenulato. 



The marble Nucula. Shell elliptical, rather solid, 

 whitish, sulcated, marbled ; ridges flattened at the 

 angles ; posterior side short, subacuminated, ven- 

 tral margin minutely crenulated. 



Hinds. Proc. Zool. Soc, 1843, p. 98. 



Hah. Straits of Malacca. 



The description of this species as given by the late 

 Mr. Hinds is so short, that in the absence of the specimen 

 the precise characters cannot be stated with certainty. 



Species 31. (Mus. Belcher.) 



Nucula declivis. Nuc. testd parvd, oblique subtri- 

 gond, soliduld, ejndermide tenui indutd ; latere 

 2}Ostico valde declivi, ad terminum rotundo ; latere 

 antico brevi, obtuso ; umbonibus elevatis, rotundis. 



The sloping Nucula. Shell small, obhquely subtri- 

 gonal, solid, covered with a thin epidermis ; pos- 

 terior side much sloped, rounded at the end, 

 anterior side short, obtuse, umboes elevated, 

 rounded. 



Hinds. Proc. Zool. Soc, 1843, p. 98. 



Hah. ? 



Species 32. (Mus. Belcher.) 



Nucula castrensis. Nuc. testd parvd, elevatd, sub- 

 trigond, lineis elevatis a medio divergentibus scidptd, 

 pallide stramined fusco rubescente fasciatd ; latere 

 'postico declivi, antico subconvexo. 



The camp Nucula. Shell small, elevated, subtrigonal, 

 sculptured with raised lines diverging from the 

 centre, pale straw banded with reddish brown; 

 posterior side sloped, anterior side rather convex. 



Hinds. Proc Zool. Soc, 1843, p. 98. 



Hab. North- West America. 



With the subtrigonal form of many of the smaller 

 species, this pretty little shell has the sculpture of 

 Nucula mirabilis and N. divaricata. 



