1901.] MOLLUSKS FROM THE PERSIAN GULE. 421 



MiTRA (Costellaria) armillata Eve. 



P.G. Telegraph -cable. Lat. 25° 58' N., long. 57° 5' E. 

 50 fathoms. 



MiTRA (Costellaria) collixsoni A. Ad. 

 P.G. No special locality. 



MiTRA (Costellaria) crebrilirata Eve. 

 P.Gr. Gulf of Ornaa, Maskat. 15 fathoms. 



MiTRA (Costellaria) d^dala Eve. 

 P.Gr. Linjab. 3| fathoms. Dec. 1900, near Pao, 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. (hastata Sowb.). 

 P.Gr. Near Bushire, rarely. 



MiTRA (Costellaria) delicata A. Ad. 

 P.G. Shaikh Shuaib I. 

 M.C. Charbar. 



MiTRA (Costellaria) fusco-apicata Sm. 

 P.Gr. Hindarabi Island. 



Mitra (Costellaria) maloolmeksis sp. n. (Plate XXIJI. 

 fig. 18.) 



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

 (var. immaculata), pauUum nitida, delicata sed solidula ; an- 

 fractibus 9-10, quorum apicales tres Icevissimi, vitrei, cceteris 

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

 rufo-vittatis, longitudinaliter arete Icevicosiatis, interstitiis 

 spiraliter profunde sulcidosis, penultimo anfractu infra inter 

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

 immaculato ; ajpertura angusta, oblonga, labro adbasim Jlexuoso, 

 paullum recurvo ; columella nitida, pallida, quadriplicata. 

 Long. 9, lat. 3 mm. 



Hab. Persian Grulf : Henjam Island, 15-25 fathoms (var. im- 

 maculata^. 



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

 15 fathoms. 



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

 24 fathoms, mud. 



Lat. 24° 55' N., long. 57° 59' E. 37 fathoms, sand and mud ; 

 abundant. Lat. 24° 5' N., long. 57° 35' E., 205 fathoms, mud 

 (with var. immaculata, this variety predominating). 



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

 this little species, evidently abundant in certain favoured localities, 

 differs in the number of longitudinal ribs, some specimens having 



