Bay of Bengal and the Arabian Sea. 169 



along the concave curve, which is not so round as the opposite 

 side, and almost defined by lateral angles. 



22. Cytherea (Caryatis) pudicissima. (PI. V. figs. 3, 4.) 



Testa parva, inaequilateralis, ovata, medioeriter convexa, alba, 

 coucentrice fortiter striata ; margo dorsi posticus leviter obliquus, 

 rectiusculus, anticus valde declivis, brevior ; margo ventralis 

 regulariter et late curvatus ; umbones parvi, haud contigui, 

 incurvati ; lunula elongato-cordata, in medio prominens, in- 

 crementi lineis striata, linea impressa circumscripta ; area nulla ; 

 cardo normalis, medioeriter fortis ; pagina interna alba, lsevis ; 

 cicatrices haud conspicuae, pyriformes ; siuus pallii haud pro- 

 fundus, obtuse cuneatus. 



Longit. 13 millim., alt. 10*3, diam. 7. 



Hab. Off Ganjam coast, 24 miles south-east of Gopalpur, 

 in 89-93 fathoms. 



This species in colour and sculpture is very like Dione 

 pura, Deshayes *, from Callao in Peru, but differs from it in 

 form, being less trigonal, and not narrowed posteriorly. The 

 umbones also are less prominent and not quite so anterior in 

 position. 



23. Abra maxima, Sowerby. (PI. V. figs. 5, 6.) 



Syndesmya maxima, Sowerby, Proc. Malac. Soc. 1894, vol. i. p. 40, 

 pi. v. fig. 5. 



Testa fere sequilateralis, utrinque hians, oblonga, antice rotundata, 

 postice acuminata, albida, nitida, lineis incrementi tenuissimis 

 striata, striisque paucis radiantibus haud conspicuis sculpta : 

 margo dorsi utrinque rectiusculus, declivis, ventralis late ex cur- 

 vatus ; umbones parvi, acuti ; lunula lanceolata, leviter excavata, 

 utrinque carina marginata ; valvse tenues, dextra carina ab um- 

 bone usque ad extremitatem posticam instructa, sinistra sulco 

 minime profundo in eodem loco sculpta ; dentes cardinales sub- 

 aequales, laterales valvar dextrae tenues, sequidistantes ; ligamen- 

 tum internum perobliquum, externum tenue, angustum ; pagina 

 interna nitida, iridescens, radiatim et transversim substriata ; 

 cicatrix anterior angusta, elongata, postica latior, pyriformis ; 

 sinus pallii profundissimus, angustus, ad extremitatem rotun- 

 datus. 



Longit. 33 millim., alt. 20, diam. 10. 



Hab. Bay of Bengal, in 128 fathoms, dead shells only ; off 



* Cat. Conch. Biv. Mus. Brit., Veneridee, p. 68 ; Romer, Monogr. Cy- 

 therea in Novitat. Conch, p. 84, pi. xxiii. figs. 1-1 k 



