16 



pictd ; latere antico racUatim striato, dilatato, anguli dorsatis ex- 

 perte ; latere postico brevissimo, longitudinaliter costulato ; mar- 

 gine cardinali elongato, convexo ; antico arcuato ; ventrali medio 

 conve.vinsculo. Long. 0-'25 ; lat. 0-50 poli. 

 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 maikings of the African Otvenii. 



MoDioLA AUCUATULA. Mod. testd clongatd, angustd, subarcuatd, 

 compressd, Iccvigatd, tenuissimd, anguli doj-salis experte ; sub epi- 

 dermide fulvo-viridescente, strigis undulatis, pm-pureo-bninneis, 

 antice transversim ornatd; costd umhonali pallidd, prominente ; 

 margine cardinali elongato, antico brevi, valde arcuato ; ventrali 

 incurvato ; extremitate anticd dilatatd, rotundatd ; posticd rotun- 

 datu, protninente, valde attenuatd, costellis paucis radiatd ; super- 

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



Hab. Singapore, at Iow \vater. Mus. Cuming, Hanley. 



Belonging to that division of ModiolcB vvhich is destitute of any 

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

 and the few narrow ribs of its posterior extremity. 



MoDiOLA soRDiDA. Mod. tcstd oblongd, ventricosd, epidermide 

 olivaced indutd ; ared anticd lamellis concentricis, membranaceis, 

 cinereo-fulvis, vestitd ; lamellaruni 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. 125 ; lat. 265. 



Hab. ■ } Mus. Metcalfe. 



The shape of this ūgly 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 duU-looking, 

 membranaceous, ashy-coloured substance, formed cf 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, \vhich is not 

 sufficiently distinct however to be termed a ray. 



LiTHODOMUs CANALIFERUS. Lit. testd clongato-oblongd, subcy- 

 lindraced, rectd, lavigatd, epidermide castaned sub tegmine calcareo 

 indutd ; tegmine in lineis elevatis, crassis, radiantibus, supernegue 

 opertis, antice ordinato ; sulco oblicuo ex umbonibus ad marginėm 

 ventralem subrectum et leviter convexiusculum, antice decurrente ; 

 margine cardinali subincurvato, elongato, leviter elevato ; antico 

 dorsali, subrecto ; extremitate anticd obtusissimd, posticd vix an- 

 gustatd. Long. 0'65 ; lat. 2. 



Hab. Found in rocks, isle of Zebu. Mus. Cuming, Hanley. 



At once recognisable by the extraordinary arrangement of its 



