434 MESSRS. MELVILL AND STANDEN ON [June 18, 



Pleuroxoma albina Lam. 



I. Lafc. 18° 43' N., long. 71° 45' E. 



Pleurotoma m armor ata Lam. 



P.G. Gulf of Oman. Good living examples dredged at 30 

 fathoms in lat. 23° 50' N., long. 67° 20' E. From Malcolm Inlet 

 (Kubbatt Ghazira) came one specimen of a possible hybrid between 

 marmorata and tigrina. 



M.C. Dead specimens frequently washed ashore on the Persian 

 coast. 



Pleurotoma tigrina Lam. 



P.G. Gulf of Oman, Malcolm Inlet at 24 fathoms, dead. 

 M.C. 7 fathoms, soft mud, but very scarce. 



Pleurotoma (Gemmula) gemmata Hinds. 



P.G. Gulf of Oman, lat. 24° o N., long. 57° 35' E., 205 

 fathom^, sand, abundant, none full-grown. Also lat. 24° 55' N., 

 long. 57° 59' E., 37 fathoms, sand and mud, and lat. 24° 49' N., 

 long. 55° 26' E., 225 fathoms, mud. 



We can see no difference in P. fusca Hombron, described from 

 New Caledonia. 



Pleurotoma (Gemmula) multiseriata Sm. 



P.G. M.C. In many places. 5-20 fathoms, mud. 



M.C. I. 12 miles west of Karachi, on the border of the 

 Mekran Coast, at 15 fathoms. Very large examples occurring here, 

 measuring £ inch. 



Pleurotoma (Gemmula) nelli^e Sm. 

 I. Karachi. 



Pleurotoma (Oligotoma) makemonos Jouss. 



P.G. Gulf of Oman, Jask beach. 



This species, described originally by Dr. Jousseaume from Aden 

 (Bull. Soc. Zool. France, 1883, p. 198, t. 10. f. 4), almost merges 

 into some varieties of poaloensis of the same author, and perhaps is 

 identical with violacea Hinds. Ln the more typical specimens the 

 longitudinal zigzag marking is characteristic, but intermediates 

 occur. 



Pleurotoma (Oligotoma) nivea Phil. 



I. Karachi. 3-7 fathoms, loose stones and muddy sand. A 

 species but little understood ; we place it provisionally here. 



Pleurotoma (Oligotoma) pouloensis Jouss. 

 P.G. Shaikh Shuaib I. 

 M.C. Charbar. 

 I. Karachi. 

 Usually in 3-5 fathoms, amongst loose stones and muddy sand. 



