197 



ventrali antico rotundato, postico leviter flemtoso ; umlonibus ni- 

 gricanti-purpurasccntibus : long. SS, alt. 2'3, lat. 1'35 poli. 

 Hab. in Peruvia et America Centrali. 



Dredged among coarse gravel, in twelve fathoms water, in the 

 Gulfof Nocoiyo. A smaller variety, which is also ratlier higher, 

 was foiind at Tumbez, at a depth of five fathoms, in thin mud. — 

 G. B. S. 



Genus Solenella, G. Sowerby. /^ 



Testą ovalis, ceguivalvis, subcecįuilateralis, compressa, nitens, epi- 

 dermide oHvaceo-viridi, tenui, induta ; dentibus cardinalibus 

 nullis, lateralibus anticis in utrdque valvd, tribus ad guaiuor, 

 lateralibus posticis phcrimis, seriem rediusculam ęffbrmaritibus, 

 omnibus parvis acutis ; impressionibus muscularibus duabus, la- 

 teralibus, subdistantibus ; impressione pallii sinu magno : liga- 

 mento externo, elongato. 

 An interesting new genus of marine*bivalves, in which the general 

 form and characters of M. Blainville's Solenocurtus are combined 

 with the series of minute sharp teeth characteristic of Nucicla. It 

 appears to belong to the family of the Solenacece, and it may at 

 once be separated from the Madracece, to which Nncula belongs, 

 by the circumstance of the whole of the ligament being external. 



SoLENELLA NoRRisii. Sol. testd albido-ccerulescente ; epidermide 

 olivaceo-viridi, zonis concentricis saturatioribus : long. 1*6, a/f. 1, 

 lat. 4 poli. 



Hab. ad Valparaiso. 



Discovered by Mr. Cuming, in soft mud, at from fourteen to 

 forty-five fathoms depth. 



This is the only species of the genus I have seen ; but Mr. Cuming 

 informs me that he obtained a single valve of another and very dif- 

 ferent species. By the specific name I wish to honour and keep in 

 remembrance Thomas Norris, Esq., of Redvales, near Būry, 

 Lancashire. — G, B. S. 



Genus Nucula. 



NucuLA ELONGATA. Nuc.testd elongatd, lanccolatd, tenui, albd, 

 epidermide Juscd prope marginėm ventralem mdutd ; subcegui- 

 taterali, latere antico breviore ; margine dorsali rectiusculd, pos- 

 tice subrejlexd ; serie dentium posticd divaricatd: long. 2*7, lat. 

 0-25, ali. 0-7. 



Hab. in Columbia Occidentali. 



Dredged in sandy mud, at a depth of twelve fathoms, at Xipi- 

 xapi. 



Nugula cuenifera. Nuo. testd elongatd, lanccolatd, Usvigatd, 

 tenuissime longitudinaliter striatd ; marginibus dorsalibus cari- 

 natis, carinis concinne crenulatis: long. 1'4, alt. 0*4, lat. 0*2 poU. 



Hab. ad Xipixapi. 



Tliis species approaches nearly in shape to Nvc.lanceolata ; it is, 

 hovvcver, broader and higher, and its dorsal margin, when the two 



