L U C I N A 



Species 33. (Fig. 33, 37, and 38 «, A, Mus. Cuming.) 

 Li'CiNA FIBULA. Luc. ten/d siiboriicularl, 7cmboiies venifs 

 oiifin iudlnald, dejiresso-convexd, radialim temd- 

 malaid, codis oblmis, ad lalera divnncatk, striis 

 niiicrnlrich eh-riitis creheirime el mbtiUssime decus- 

 .s(,(i\ . nIhiiUi. iiilifnhim rosed aid fiavicunie. 

 I'liF, iiui riiN L\ (INA. Shell nearly orbicular, inclined 

 anteriorly towards the mnboes, deprcssly convex, 

 radiately finely ribbed, ribs obtuse, divaricate at tlie 

 sides, very closely and finely decussated with con- 

 centric raised striic ; whitish, sometimes pink or 

 yellowish. 

 Ihih. St. Elena, West Columbia (from sandy mud at a 

 depth of about six fathoms) ; and Islands of Burias 

 and Ticao, Philippines (in sandy mud at low water) ; 

 Cuming. 

 The seven allied varieties represented in this plate 

 belong to two species, the present of which difters mainly 

 from the following in the extreme lateral ribs divaricating 

 off from the plan of radiation. 



Species 3-t. (Fig. 31 and 35 a, i, AIus. Cuming.) 



LuciNA PECTEN. Luc. testd transverse orhieulari, de- 

 presso-coiivexd, radiatim leiiuicostatd, costis oblmis, 

 inlerdani diiplicalis, stn'is elecatis creberrime sijmtuiato- 

 decussatis ; albidd. 



The comb Lucina. Shell transversely orbicular, de- 

 pressly convex, radiately finely ribbed, ribs obtuse, 

 sometimes duplicate, very closely sqnamately decus- 

 sated with raised strife ; whitish. 



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

 p. 230. 



IM. Island of St. John, West Indies; llartvig. Lord 

 Hood's Island (in the crevices of wells) ; Cuming. 

 More depressed and rather more transversely orbicular 



than the L. fibula, whilst the extreme lateral ribs do not 



divaricate oif as in that species. 

 For Sp. 35, 37, and 38, see PI. X. 



(Species 36. Mus. Cuming.) 



Lucina rotund ata. Luc. testd transverse subquadratd, 



tumidd, valde incequilalerd, leevigatd, Uiteis incremenll 



hie illic notatd, lateribiis simpUcibus, lunula uulld, 



June 



cardiiie deniibus centralibus duabics, (luarum una bifida 

 in tdrdque valvd ; albidd, epidermide teiiui pnrtini 

 induld. 



The rodnded Lucina. Shell transversely subsquarc, 

 swollen, very iue(juilateral, smooth, marked here 

 and there with lines of gi'owth, sides simple, no 

 lunulc, hinge with two central teeth in each valve, 

 one of which is bifid ; whitish, partially covered with 

 a thin epidermis. 



Turton, Conch. Dythyra Brit. p. 114. pi. 7. f 3. 

 Psammobia rulundala, Fleming. 

 Diplodonta rotundata, Philippi. 

 Eadem. Diplodonta dilatata, Philippi. 



Ilab. Mediten-anean and Southern shores of Britain. 



This species, having no ribs, lunule, or lateral excavation, 

 is far removed in external character from the type of 

 Lucina, whilst the hinge is distinguished, as in the case 

 of L. cadata, by a conspicuous bifid tooth. There are 

 several other species referred to Lucina in this monograph 

 with a similar characteristic dentition. 



Species 39. (Mus. Cuming.) 



Lucina spinifera. Luc. testd longitudinaliter ovatd, 

 subcompressd, nmbones versus subtrigond, concentrice 

 creberrime laminato-striatd,striis ad latera elevatioribus, 

 per marginem posticuni spinoso-stjuamatis, area liga- 

 meidi lanceolato-planatd, umhonibus compressis, lunula 

 oblongo-ovatd, peculiariler excavalu ; sordide alba, 

 ferrugineo tinctd. 



Tub spiny Lucina. Shell longitudinally ovate, rather 

 compressed, inclined to triangular towards the um- 

 boes, concentrically very closely laminately striated, 

 striae more raised at the sides, spinous-squamate 

 along the posterior margins, area of the ligament 

 lanceolately flattened, umboes compressed, lunule 

 oblong-ovate, peculiarly excavated ; dull white, rust- 

 stained. 



Fenus spiniferu, Montagu, Test. Brit. p. 577, pi. 17. f 1. 

 Mtjrtea spinifera, Turton. 

 Lucina spinifera, Hanley. 

 Lucina lliatelloides, Philippi. 



Hab. Mediterranean and Southern shores of Britain. 

 Ireland. North Scotland. Norway. 

 The nearest representative of L. spinifera in tropical 



