Bay of Bengal and the Arabian Sea. 251 



34. A7'ca (Barbatia) incerta. 



Testa oblonga, postice latior, valde inaequilateralis, costis numerosis 

 tenuibus sulcisque transversis nodose cancellata, alba, epiderinide 

 fuscescente plus minus induta ; latus anticum angustum, oblique 

 curvatum, posticum magis obliquum, fere rectum, yentrale in 

 medio subincurvum vel subsinuatum ; valvse mediocriter crasspe, 

 impressione levi ab umbone ad marginem ventris radianti notatae, 

 intus albje, obsolete radiatim lineatae ; umbones parvi, acuti, haud 

 contigui, longe antrorsum siti ; dentes cardinis utrinque umbonera 

 obliqui, posterioribus paucis elongatis ; pagiiia iuterua alba, 

 radiatim substriata. 

 Longit. 23 millim. ; diam. 8 ; alt. 11. 



Hab. Station 232, off Tiavancore coast, in 430 fatli. 

 Allied to A. scabra, Poli, and A. nodulosa, Mullei— indeed, 

 perhaps indistinguishable from the latter. 



35. Lima indica. 



Testa L. excavates peraffinis, sed minus elongata, striis radiantibus 



tenuioribus et magis numerosis insculpta. 

 Longit. 75 millim. ; latit. 61 ; diam. 34. 



Bab. Station 232, off Travancore coast, in 430 fath. 



Two specimens obtained, one 75 millim. in length, the 

 other 51. In all probability the species attains much larger 

 dimensions, perhaps equalling that of the well-known 

 Norwegian L. excavata. There are now three so- called 

 species which are very closely related, namely L. excavata 

 (Chemnitz), L. goliath, Sowerby, and L. indica— indeed 

 they might almost be regarded as varieties of one and the 

 same species. The present form appears to be a trifle less 

 elono-ate, and the radiating strise are considerably more 

 numerous and finer. The Japanese L. goliath was supposed 

 to be the largest species of the genus, the type specimen 

 having a length of 150 millim. and a width of 110. These 

 dimensions, however, are exceeded in an example of L. exca- 

 vata in the British Museum, which is 170 millim. long and 

 125 broad. 



[To be continued,] 



