15 



cosd,postice Icevi, antice costatd, epidermide flavo-rufescente indutd; 

 costis planulatis, radiantibus, furcatis, subramosis, distantibus ; 

 margine cardhiali brevissimo , subrecto ; margine antico primum 

 incurvato et vix declivi, deinde convexo et abrupte declivi ; ventrali 

 incurvato ; extremitate anticd subbiangulatd, valde compressd ; ca- 

 rind umbonali conspicud, in junioribus acutd ; superficie internd, 

 antice purpureo tinctd; cardinis extremitatihus crenatis ; angulo 

 dorsali pariim elevato. Long. 0"55 ; lat. 1"30. 



Hab. Cagayan, pr. Misamis, insulae Mindanao. 



Mus. Cuming, Hanley. 



Closely allied to M. sulcata of Lamarck, but in that species the 

 rib-like strise are crowded and numerous. The beaks are all but ter- 

 minai, acute, and incurved. 



MoDioLA Philippinarum. Mod. testd ovato-oblongd, iumidd, Icevi, 

 antice barbatd ; epidermide nitidd, fuho-castaned, in medio palies - 

 cente, indutd; angulo dorsali distincto, rotundato ; margine dor- 

 sali elevato, subelongato, convexiusculo ; antico breviore, subrecto, 

 subincurvato ; extremitate anticd latd, rotundatd ; posticd brevi, 

 prominuld, nitore epidermidis orbatd ; natibus angustis, conspicuis ; 

 carind umbotiali prominente ; superficie internd, antice atropur- 

 pured. Long. 2' 20 ; lat. 4 poli. 

 Hab. Zebu, Philippinarum. Mus. Cuming, Hanley. 

 Possessing a sort of general resemblance to M. Modiolus, its more 

 elongated hinge-margin, and the greater projection of its hinder ex- 

 tremity, suffice to distinguish it from that species, The rich intemal 

 colouring of its anterior slope, and the pecaliarity of the lunule-like 

 posterior space, which is destitiite of lustre, form the principai fea- 

 tures of its characteristics. 



MoDiOLA BiRADiATA. Mod. testd oblongo-trigond, Icevigatd, ven- 

 tricosd ; sub epidermide sordide f ulvd, antice purpureo tinctd, deindi 

 radio albido ornatd, aredgue posticd pallide brunned et radio pal- 

 lidiore ad extremitatem ėjus prominulam notatd ,• margine cardinali 

 elevato, subrecto, elongato ; angulo dorsali distincto ; margine ven- 

 trali medio incurvato ; antico subrecto, elongato, paiiluliim retuso ; 

 extremitate anticd productd, rotundatd ; carind umbonali promi- 

 nente ; superficie internd antice purpured. Long. 125 ; lat. 2'50. 



Hab. ? Mus. Metcalfe. 



The glossy epidermis, \vhich is appai'ently destitute of any distinct 

 beard, although sufficiently rough on the anterior slope to render its 

 occasional presence not improbable, ceases entirely just before reach- 

 ing the hinge-margin, leaving a long narro\v strip of dull dusky 

 purple. Its general shape closely resembles albicosta of Lamarck, 

 with •which briefly-described species it has doubtless been confused 

 by the majority of collectors. That species, however (whose original 

 type I carefully examined at Paris) , difFers both in other respects and 

 by the clear fawn-colour of its epidermis. 



MoDioLA STRiGATA. Mod. testd pūrvd, tenuissimd, subdepressd, 

 oblongd, viresrente, sti-igis undulatisfusco-piirpureis, irregulariter 



