1901.] MOLLFSKS FROM THE PERSIAN GULF. 421 



MlTRA (COSTELLARIA) ARMILLATA Eve. 



P.G. Telegraph -cable. Lat. 26 e 58' N., long. 57 c 5' E. 

 50 fathoms. 



Mitra (Costellaria) colli>so>i A. Ad. 

 P.G-. No special locality. 



Mitra (Costellaria) crebrilirata Eve. 

 P.G. Gulf of Oman, Maskat. 15 fathoms. 



Mitra (Costellaria) d.ebala Eve. 

 P.G. Linjah. 3£ fathoms. Dec. 1900, near Eao, fine 

 M.C. Charbar Bay. 3 fathoms, sand and mud. 

 Dead examples frequently cast ashore all over the coasts of 

 Baluchistan. 



Mitra (Costellaria) casta H. Ad. (kastata Sowb.). 

 P.G. Near Bushire, rarely. 



Mitra (Costellaria) delicata A. Ad. 

 P.G. Shaikh Shuaib I. 

 M.C. Charbar. 



Mitra (Costellaria) fusco-apicata Sm. 

 P.G. Hindarabi Island. 



Mitra (Costellaria) malcolmensis sp. n. (Plate XXI J I. 

 fig. 18.) 



M. testa oblongo-ovata, fusiformi, pallide straminea vel albescente 

 (var. immaculata), paullum nitida, delicata sed solidida ; an- 

 fractlbus 9-10, quorum apimles tres losvissimi, vitrei, cceteris 

 gradatulis, ad suturas impressis, infra (juxta suturas) spiraliter 

 rufo-vittatis, longitudinaliter arete Icevicostatis, interstitiis 

 spiraliter profundi sulculosis, pemdtimo anfractu infra inter 

 castas rubro-fasciato, ultimo bifasciato, interdum omnino albo, 

 immaculato ; apertura angusta, oblong a, labro adbasim fiexuoso, 

 paidlum recurvo ; columella nitida, pallida, quadriplicata. 

 hong. !'. Int. 3 mm. 



Huh. Persian Gulf: Ilenjam Island, 15-25 fathoms (var. im- 

 maculata). 



Linjah, 3| Eathoms, mud. Elphinstone Inlet, Mussandam, 

 15 fathom-. 



Gulf of Oman : Malcolm Inlet (Kubbatt Ghazira), near Maskat. 

 24 fathoms, mud. 



Lat. 24° 55' X., long. 57° 59' E. -">7 fathoms, sand and mud ; 

 abundant. Lat. 21 5' .V, long. 57° 35' E., 205 fathoms, mud 

 (with var. imm>iridaln. this variety predominating). 



Variable both in sculpture and colouring, though not so in form, 

 this little Bpecies, evidently abundant in certain favoured localities, 

 differs in the cumber of longitudinal ribs, Borne specimens having 



