NUCULA.— Plate I. 



The decussated Nucula. Shell solid, trigonal, elevated, 

 rather compressed, decussated with concentric 

 ridges and radiating stria; ; ventral margin 

 tliickly crenated ; lunule large, convex, smooth in 

 the middle, corrugated at the margin ; apices 

 elevated, subacuminated, sides sloped. 



SowEEBY. Cone. lUust., f. 18. Thes. Cone. Hanley, 

 Sp. 1. 



Nucula sulcata, Philippi. 



Hal. British and Mediterranean Seas. 



Species 4. (Mus. Cuming in Brit.) 



Nucula mirabihs. Nuc. testd oblique trigond, suh- 

 compressd, solidd ; divaricatim costellatd, costellis 

 angidos acutos in medio testes formatUihus ; latere 

 postico brevi, obscure biangulatd ; latere antico 

 oblique acuminatim producto. 



The wonderful Nucula. Shell obliquely trigonal, sub- 

 compressed, solid ; divergently ribbed ; riblets 

 forming acute angles in the middle of the shell ; 

 posterior side short, obscurely biangular ; anterior 

 side obliquely acuminately produced. 



Adams and Eeeve. Zool. Samarang, 75, pi. 21, f. 8. 



Hab. Japan. 



The sculpture of this shell is very beautiful. It is 



one of the largest species. 



(Mus. Cuming 



rit.) 



bpecies 0. 



Nucula Cumingii. Nuc. testd ovatd, utrinque subacu- 

 minatd, subcompressd, lavigatd ; latere postico 

 acuminatim jjroducto, lunidd parvd lanceolatd, 

 idanulatd ; apice acuminata ; margine ventrali 

 semicircidari ; latere antico producto, ad termiaum 

 subacuminato, margine dorsali subcremdato, ared 

 impressd ad marginem convexd. 



Cuming's Nucula. Shell ovate, subacuminated at each 

 end, subcompressed, smooth ; posterior side 

 acuminately produced, lunule small, lanceolate, 

 flattened ; apex acuminated ; ventral margin 

 semicircular; anterior side produced, a little 

 acuminated at the end ; dorsal margin slightly 

 crenulated ; with an impressed margin convex at 

 the margin. 



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

 Ilab. Indian Archipelago. 



A very smooth shell, in which the posterior side is a 

 little more produced than usual, and in which both ends 

 are acuminated. 



Species 6. (Mus. Cuming in Brit.) 



Nucula infl.\ta. Nuc. testd ovato-suhrotundd, Icevi- 

 gatd, injlatd, obtusd ; latere postico brevlhsculo, 

 lunuld indistinctd, panulatd, apice ohtuso, mar- 

 gine ventrali conveoco ; latere jwstico oblique tumido, 

 vix angulato, margine dorsali valde convexd. 



The inflated Nucula. Shell ovatelysubrotund, smooth, 

 inflated, obtuse; posterior side rather short, 

 lunule indistinct, flattened, apex obtuse, ventral 

 margin convex ; posterior side obliquely tumid ; 

 scarcely angular ; dorsal margin very convex. 



H.VNDCOCK. Ann. of Nat. Hist., 1846, p. 333, pi. 5, 

 f. 13, 14. 



Nucula obliquata. Beck. 



Hab. Arctic Seas. 



More swollen, obtuse, and tumid than Nucula tenuis, 

 which it otherwise resembles. 



Species 7. (Mus. D'Orbigny in Brit.) 



Nucula Puelcha. Nuc. testd oblique donaciformi, 

 solidd, injlatd ; Icevigatd, albidd, versils mar- 

 ginem ventralem et ad latera concentrice rugatd ; 

 latere postico brevissimo, truncate ; apice obtuso ; 

 latere antico oblique producto; margine ventrali 

 antice oblique convexo. 



The Puelcha Nucula. Shell obliquely donaciform, 

 solid, inflated ; smooth, whitish, concentrically 

 wrinkled towards the ventral margin and at the 

 sides ; posterior side very short, truncated ; apex 

 obtuse ; anterior side obliquely produced ; ventral, 

 margin anteriorly obliquely convex. 



D'Orbigny. Amer. Merid., G24, pi. 84, i\ 24-G. 



Hab. San Bias, Puelcha, &c., N. Patagonia, Central 

 America 



An oblique donaciform shell, much inflated towards 

 the anterior side. 



