368 Zoological Society. 



brevi radiathn costulato, costis pcmcis, distantibus ; latere antico 

 prodifcto, tcnuissime radiatim striata, striis ad cjctremitatem anti- 

 cam clevatis, divaricatis ; ured intermedia Icevigatd ; margine 

 dorsali suhrecto, vix elevato, marginis antici convexi longitudinem 

 ecquante ; margine ventrali incurvato ; angulo dorsali inconspicno ; 

 umbonibus plamdatis ; superficie interna purpurea ; cardine, ad 

 extremitatem ligamenti, crenato. Long. 0"60; lat. 1-40 poll. 

 Hub. Batangas, insularum Philippinaruin. Mus. Cuming, Hanley. 

 Closeh' similar to plicata in shape, sculpture, and the colour of its 

 epidermis ; the rich purple of its interior, its smaller size, and the 

 greater delicacy of its markings, at once proclaim its distinctness. 

 It is usually rayed anteriorly with narrow mterrupted hlack streaks. 

 MoDioLA SUBRAMOSA. Mod. tcstd oblongo-angustatd, subventri- 

 cosd,postice Icevi, antice costatd, epidennide flavo-i-ufescente indutd; 

 costis plunulatis, radiantibas, furcatis, subramosis, distantibus ; 

 margine cardinali brevissimo, subrecto ; margine antico primum 

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

 incurvato ; extremitate anticd siibbiangulatd, valdc cotnpressd ; ca- 

 rind umbonuU conspicud, in junioribus acutd ; superficie internd, 

 antice piurpureo tinctd ; cardinis extremilatibus crenatis ; angulo 

 dorsali parum elevato. Long. O'oo ; lat. 1"30. 

 Hab. Cagayan, pr. Misamis, insula? Mindanao. 

 Mus. Cuming, Hanley. 



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

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

 minal, acute, and incurved. 



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

 antice barbatd; epidermide nitidd, fulvo-castaned, in medio palles- 

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

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

 subincurvato ; extremitate anticd latd, rotundutd ; posticd brevi, 

 prominuld, nitore epidermidis orbatd ; natibus angustis, conspicuis ; 

 carind umbonali prominente ; superficie inter7ui, antice atropur- 

 pured. Long. 2- 20 ; lat. 4 poll. 

 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 internal 

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

 posterior space, which is destitute of lustre, form the principal fea- 

 tures of its characteristics. 



MoDiOLA BiRADiATA. Mod. tcstd oblo/igo-trigond, Icevigatd, ven- 

 tricosd; sub epidermide sordidefulvd, antice purpurea tinctd, deinde 

 radio albido ornatd, aredque posticd pallide bnmned et radio pal- 

 lidiore ad extremitatem ejus prominulam notatd ; margine cardinali 

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

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

 extremitate anticd productd, rotundatd ; carind umbonali promi- 

 nente ; superficie internd antice purpured. Long. r2o ; lat, 2*50. 

 Hab. ? Mus. Metcalfe. 



