22 Melvill, Descriptions of Marine Mollusca. 



intus denticulato-serrato, umbonibus parvis, hand conspicuis, 

 lunula brunnea, angusta, valvis longitudinaliter radiatim 

 sulcatis, sulcis irregularibus, interstitiis incequalibus, postice 

 majoribus. 



Alt. 7*50, diam. 3*50, lat. 10 mm. 



Hab. Mekran Coast. 



A small somewhat triangular species, almost colourless, 

 except for one or two cinereous blotches on the posterior 

 side; it is slightly produced anteriorly, the ventral margin 

 being almost straight. Umboes inconspicuous, the valves 

 being longitudinally radiately ornamented with irregular 

 sulcations, the sulci not being equi-distant, large inter- 

 stitial spaces occurring on the posterior side. The 

 lunule is dark brown, and narrow. 



Allied to the group of C. Layardi, Sec. 



Dosinia globa (A. Ad. Mss.), sp. nov. (PI. 7, f. 35). 



D. testa fere rotunda, solida, sordide alba, omnino concen- 

 trice regidariter costulata, costis parvis, simplicibus, antice 

 abbreviata, cum margine ventrali ad latus posticum rotundato, 

 umbonibus incur vis, lunula cor data. 



Alt. 25, lat. 26, diam. 12mm., sp. max.; alt. 15, 

 lat. 18, diam. 9 mm., sp. min. 



A typical Dosinia, apparently common on the East 

 coast of the Arabian Sea. It is in our Bombay list, as col- 

 lected by Mr. Abercrombie, under the name D. gibba Ad., 

 and also in Paetel's catalogue (Vol. III., p. 90), under 

 the same name, without locality or reference. We think 

 there has been some confusion here, and that this Mollusc 

 has never been properly described, and accordingly we 

 consider it best to rectify this omission at the present 

 opportunity. 



