L U C I N A . 



Species 27. (Fig.a.b, Mus. Cuming.) 



LuciNA C.ELATA. Lkc. testd fflobosa, crassmsciihi, tuiuidd, 

 covicentricL' striata, pecidiariter tindato-calatd et erosd, 

 cardlne dfiifibiis ceiitralibus dicabus aiiffiisiis, quarum 

 wid prom'uiidd erectd bifida in utrdipw valvd ; alba. 



The carved Lucina. Shell globose, rather thick, 

 swolieu, concentrically striated, peculiarly carved 

 and eroded in a waved manner, hinge composed of 

 two central teeth, one of which is rather prominent, 

 erect, and bifid in each valve ; white. 



Hub. Island of Muerte, Bay of Guayaquil (dredged from 

 a depth of about eleven fathoms) ; Curaing. 



This is a remarkable shell, and belongs apparently to 

 the genus Biplodonta, of which our British Lucina rotwn- 

 data is the type ; it has, however, the narrow oblong 

 posterior muscular scar. The hinge is characterized by 

 a peculiar erect bifid tooth, and externally the valves are 

 carved with a curious zigzag pattern upon an opake eroded 

 ground. 



Species 28. (Mus. Cuming.) 



Lucina virgo. Luc. testd mbquadrato-orbiculari, erassd, 

 solidd, postice sttlco compicue excamtd, antice lunuld 

 ampld late cordatd impressd, concentrice snbtilissime 

 liratd, liris tenuibm, membranaceis ; semipellucido- 

 albd, cpidermide tenia corned indutd. 



The virgin Lucina. Shell somewhat squarely orbi- 

 cular, thick, solid, posteriorly conspicuously exca- 

 vated with a groove, anteriorly with a large broadly 

 cordate impressed lunule, concentrically very finely 

 ridged, ridges thin, membranaceous ; semi-trans- 

 parent white, covered with a thin horny epidermis. 



Hab. ? 



Eesembling L. colunibella, but more depressed, and 

 characterized by a simple, and therefore dift'erent sort 

 of epidermis. From L. Pemwjlvanica it difl'ers in having 

 a broader cordate lunule. 



Species 39. (Mus. Cuming.) 



Lucina Pennsylvanica. Lnc. testa sitbquadrato-orbi- 

 cidari, erassd, solidd, postice siilco co/ispicue cxxavatd, 



June, 



antice lunuld ampld oblongo-cordatd impressd, con- 

 centrice subtiliter liratd, liris ienuibus, memh-anaceis ; 

 albd, epidermide ienui corned, liras super hie illic 

 pecidiariter quadrato-squamatd, indutd. 



The Tennsylvanian Lucina. Shell somewhat s<|uarely 

 orbicular, thick, solid, conspicuously excavated on 

 the posterior side with a groove, anteriorly with an 

 obloug-eordate impressed lunule, concentrically very 

 finely ridged, ridges tliin, membranaceous ; white, 

 covered with a thin horny epidermis, which is pecu- 

 liarly quadrate-squamate here and there. 



Venus Pennsyhaniea, Linna3us, Syst. Nat. p. 1134. 



Lucina Pennsi/hanica, Lamarck. 



Hab. Jamaica ; Gosse. 



This species presents a singular appearance, from the 

 circumstance that the horny epiderm, composing tlie con- 

 centric ridges, turns over here and there towards the 

 umboes in scales, which are mostly square, and look like 

 solid particles deposited in the interstices. 



It is very much to be doubted whether the Lucina 

 Pennsylvanica really inhabits the shores from whence it 

 derives its name ; should that not be the ease I would 

 propose to call it L. grandinata. The specimen here 

 figured was collected by Mr. Gosse, at Jamaica. 



Species 30. (Mus. Cuming.) 



Lucina coLU>rBELLA. Luc. testd globosu, crassissimd, 

 solidd, postice sulcato-excavaid, antice. lunuld perampld 

 cordatd impressd, concentrice multiliratd, liris brevi- 

 Lus subobtusis ; albd, epidermide erassd arete liratd 

 indutd. 



TuE LITTLE DOVE LuciNA. Shell globosc, very thick, 

 solid, posteriorly suleatcly excavated, anteriorly 

 impressed with a very large cordate lunule, concen- 

 trically many-ridged, ridges shoi-t and rather obtuse ; 

 white, covered with a thick compactly-ridged epi- 

 dermis. 



Lamarck, Anim. sans vert. (Deshayes' edit.) vol. vi. 

 p. 230. 

 Lucina Adamsoni, D'Orbigny. 



Hub. Canary and Cape de Verd Islands. Senegal. 



In this species the epidermis is formed on the ridges 



in stout closely-compacted strips. 



