Zoological Society. 369 



The glossy epidermis, which is apparently 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 narrow 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 parvd, tenuissimd, subdepressd, 

 oblongd, virescente, strigis undulatis fusco-purpureis, irregulariter 

 pictd ; latere antico radiatim striato, dilatato, anguli dorsalis ex- 

 perte ; latere postico brevissimo, longitudinaliter costulato ; mar- 

 gine cardinali elongato, convexo ; antico arcuato ; ventrali medio 

 convexiusculo . Long. 0*25 ; lat. 050 poll. 

 Hab. Sibango, isle of Zebu ; in ten fathoms, sandy mud. Mus. Cu- 

 ming, Hanley. 



For this and the succeeding species we are indebted to the re- 

 searches of H. Cuming, Esq., in the Philippine Islands. The shell, 

 though small, is far from inelegant, and unites the contour of the 

 British discrepans with the zigzag markings of the African Owenii. 



Modiola aucuatula. Mod. testd elongatd, angustd, subarcuatd, 

 compressd, Icevigatd, tenuissimd, anguli dorsalis experte ; sub epi- 

 dermide fulvo-viridescente, strigis undulatis, purpureo-brunneis, 

 antice transversim ornatd ; costd umbonali pallidd, prominente ; 

 margine cardinali elongato, antico brevi, valde arcuato ; ventrali 

 incurvato ; extremitate anticd dilatatd, rotundatd ; posticd rotun- 

 datd, prominente, valde attenuatd, costellis paucis radiatd ; super- 

 ficie internd, antice purpureo tinctd. Long. 0*50; lat. 1*50. 



Hab. Singapore, at low water. Mus. Cuming, Hanley. 



Belonging to that division of Modiola; which is destitute of any 

 dorsal angle, it is remarkable for its narrow sickle- shaped contour, 

 and the few narrow ribs of its posterior extremity. 



Modiola sordida. Mod. testd oblongd, ventricosd, epidermide 

 olivaced indutd ; area anticd lamellis concentricis , membranaceis, 

 cinereo-fulvis, vestitd ; lamellarum margine barbato ; costd umbo- 

 nali prominente ; angulo dorsali obtusissimo ; margine cardinali 

 breviusculo, parum elevato ; antico elongato, in adultis retuso ; ven- 

 trali incurvato ; extremitate posticd brevissimd,obtusissimd ; super- 

 ficie internd, antice purpureo tinctd. Long. T25 ; lat. 2* 65. 



Hab. ? Mus. Metcalfe. 



The shape of this ugly species closely resembles that of M. Mo- 

 diolus, but the colour of its epidermis and its peculiar beard will easily 

 distinguish it. This latter appendage is composed of a dull-looking, 

 membranaceous, ashy-coloured substance, formed of lamellae, which 

 near the ventral edge curl upwards towards the beaks ; the edges 

 are here and there fringed with elongated lanceolate filaments. The 

 umbonal ridge is edged posteriorly by a paler streak, which is not 

 sufficiently distinct however to be termed a ray. 



