250 Mr, E. A. Smith on Mollusca from the 



aequales ; umbones parvi, acuti, postmediani ; dentes cardinales 

 duo insequales in utraque valva, laterales valvse dextroe elongati, 

 tenues, posterior antico remotior ; pagina interna albida, zonis 

 concentricis subcasruleis picta, radiatim tenuissime substriata ; 

 cicatrix antica elongata, angusta, postica rotundata ; sinus pallii 

 perprofundus. 

 Longit. 44 millim. ; diam. 11 ; alt. 25. 



Hob. Station 229, off Travancore coast, in 360 fath. 



Thinner and narrower than T. staurella ; without colour- 

 rays, with more delicate finer concentric sculpture, a less 

 prominent posterior ridge in the right valve, and a siiallower 



groove in the left. 



32. Ahra affinia. 



Testa A. maximcB similliraa, sad minor, convexior, postice minus 

 producta vel minus cuneiformis, hinula latiore praesertim parte 

 valvse sinistra^, sinuque lineie pallii antice magis acuto. 



Longit. 27 millim. ; diam. 9 ; alt. 17. 



Hah. Off Travancore coast, in 498 fath. 



The differences between A. maxima^ ^ Sow., A. convexior f, 

 Smith, and the present species are quite appreciable on com- 

 parison, although resembling one another in some respects. 



33. Myodora quadrata. 



Testa compressa, paulo inaequilateralis, postice latissirae truncata, 

 antice obtuse cuneiformis ; margo dorai posticus declivis, fere 

 rectilinearis, anticus valde descendons, subrectilinearis quocjue, 

 ventralis late curvatus ; valva dextra mediocritcr profunda, solidi- 

 uscula, intus conspicue margaritacea, extus concentrice sulcata et 

 lamcllata, area postica porca baud profunda ad umbone radiante 

 obscure limitata ; sinus pallii latissimus, baud profundus; valva 

 sinistra — ? 



Longit. 12| millim. ; alt. 11. 



Hah. Station 229, off Travancoi'e coast, in 360 fath. ; also 

 Station 2H3, off Andaman Islands, in 185 fath. 



Remarkable on account of the very broad truncated poste- 

 rior end and the very pearly interior. It is not anticipated 

 that the left valve would offer any special features. It is 

 probably flat and more feebly sulcated than the right. 



• Ann. & Ma^. Nat. Hist. 1894, vol. xiv. p. lOft, pi. v. figs. 5, G. 

 t Op. cit. 1%'dh, vol. xvi. p. 10, pi. ii. tigp. 4, 4 a. 



