458 MESSES. MELVILL AND STANDEN ON [Juue 18, 



Lat. 24° 49' N., long. 56° 56' E. 225 fathoms, mud. 

 „ 24° 55' N., „ 57° 59' E. 37 

 „ 25° N^, „ 57° 08' E. 500 

 These five species occurred together, all dead, and aggregated 

 in vast quantities at the bottom of the sea, with the Heteropod 

 Atlanta peronii Less. 



Order PULMONATA. 

 Earn. AuRicFLiD^. 



It is not our intention to dwell on the bulk of the brackish- 

 water species which occur intermingled often with the truly marine. 

 We have thus passed over, in a previous part of this paper, the 

 Assiminiece, Stenotliyrce, and ffydrobiidce. At the same time, we 

 feel it only right to give Mr. Townsend's opinion, who has studied 

 the species so closely in situ, that he considers Flecotrema lirata 

 Ad. and P. si/hesii Melv., both common at Karachi, to be strictly 

 marine. He adds : " The rocks they inhabit are submerged by 

 salt-water every tide, and there is no river nor fresh water any- 

 where in the locality." 



Class SCAPHOPODA. 

 Earn. Denxaliid^. 



Dentalium attentjatum Sowb. 

 P.Gr. Kais Island. 10 fathoms. 



Dentalium conspicuum Melv. 



I. Karachi. 3 to 7 fathoms, mud and loose stones. 



Dentalium javanum Sowb. 

 I. Karachi. 



Dentalium longiteoesum Reeve. 

 I. Bombay (Abercrombie). 



Dentalium octogonum Lam. 

 E.G. M.O. I. 



Generally distributed from Bushire to Karachi ; 3-7 fathoms, 

 mud or muddy sand bottom. 



Dentalium politum L. {ebarneum Desh.). 

 E.G. M.C. I. 



Generally distributed at 7-60 fathoms, on mud. Those obtained 

 atl'he greater depth are much the finer. 



Dentalium porcatum Gould. 

 I. Karachi. 



