368 Zoological Society. 



brevi radiatim costulato, costis paucis, distantibus ; latere antico 

 producto, tenuissime radiatim striato, striis ad extremitatem anti- 

 cam elevatis, divaricatis ; ared intermedid Icevigatd ; margine 

 dorsali subrecto, vix elevato, marginis antici convexi longitudinem 

 eequante ; margine ventrali incurvato ; angulo dorsali inconspicuo ; 

 umbonibus planulatis ; superficie interna purpurea ; cardine, ad 

 extremitatem ligamenti, crenato. Long. 0'60; lat. 1*40 poll. 

 Hab. Batangas, insularum Philippinarum. Mus. Cuming, Hanley. 

 Closely 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 interrupted black streaks. 



Modiola subramosa. Mod. testd oblongo-angustatd, subventri- 

 cosd,postice l<zvi, antice costatd, epidermide flavo-rufescente indutd; 

 costis planulatis, radiantibus, furcatis, subramosis, distantibus ; 

 margine cardinali 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 extremitatibus crenatis ; angulo 

 dorsali parum elevato. Long. 0'55 ; lat. 1*30. 



Hab. Cagayan, pr. Misamis, insulse 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- 

 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, rotundatd; posticd brevi, 

 prominuld, nitore epidermidis orbatd ; natibus angustis, conspicuis ; 

 carind umbonali prominente ; superficie internd, 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. testd oblong o -trig ond, Icevigatd, ven- 

 tricosd; sub epidermide sordidefulvd, antice purpureo tinctd, deinde 

 radio albido ornatd, aredque posticd pallide brunned 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, paululum retuso ; 

 extremitate anticd productd, rotundatd; carind umbonali promi- 

 nente ; superficie internd antice purpured. Long. 1*25 ; lat. 2*50. 



Hab. ? Mus. Metcalfe. 



