1901.] MOLLITSKS FROM THE PEBSIAN GTJLF. 367 



RiSSOIKA AMBIGUA Gould. 



I. Bombay. Old record. 



Eeported from both Aden and Ceylon. There are no typical 

 specimens in the Indian Museum, Calcutta, from our area (c/. 

 a. Nevill, Hand-list of MoUusca, Calcutta, 1885, p. 73.) Of the 

 var. perpusilla Nevill, examples occur from P.Gr. Henjam 1., and 

 I. Bombay, collected by Mr.' W. T. Blanford, 



ElSSOINA MICANS A. Ad. 



P.G". Tumb I., Kishm I., and Mutef (W. T. Blanford in 

 G. Nevill, Hand-Hst). Gulf of Oman, lat. 26° 23' N., long. 56° 

 53' E. ; also lat. 24° 44' N., long. 55° 56' E. 205 fathoms. 

 Var. perstriatula Nevill. 

 P.G. Tumb I. ( W. T. Blanford, 1. c). 

 EissoiNA scEPTEUM-EEGis, sp. n. (Plate XXII. fig. 11.) 

 E. testa suhperforata, pergracili, nitida, solida, alheseente ; anfrac- 

 tibus 12i, quorum 3| apicales, mamillati, parvi, vitrei, coiteris 

 nitentihus, Icevissimis, longitudinaliter recticostatis, costis Icevibus, 

 ad suturas imp>ressis, tumidulis, idtimo anfractu infra inedium 

 costis evanidis, deinde ad basim spiraliter sex vel septem lirato ; 

 apertiira rotando-ovata ; labro incrassato, ad basim paullum 

 effuso ; columella simplice, nitida. 

 Long. 9*50, lat. 2 mm. 



Hab. Gulf of Oman, lat. 24° 05' N., long. 57° 35' E. 205 

 fathoms. 



One of the most interesting of the abyssal species dredged at 

 over the 100-fathoms line. It is quite unlike any Eissoid known 

 to us, and there is nothing approaching it in the National Collec- 

 tion, or depicted in any monograph of the family. From the 

 figure of B. nevillana Weink., from Hongkong, a rapprochement 

 is, we fancy, discernible, and for the present, at all events, would 

 place it among the Eurissoinas, near that species. 



It is a solid, shining, smooth, hardly perforate, attenuately slender, 

 whitish cinereous shell, with very faint, almost imperceptible 

 ochi'eous tinge below the sutures ; the 3| apical whorls are small, 

 shining, vitreous, the next rapidly increasing proportionately in 

 size, and then with but gradual increase to the body-whorl. All 

 these whorls are longitudinally smoothly costate, the 10 ribs of 

 the body-whorl vanishing below the middle, which is thence to the 

 base six or seven times spirally lirate. The mouth is oval ; outer 

 lip thickened, only slightly effuse towards the base ; columella 

 simple, white. 



EissoiNA (Eissolina) distans Anton (=:canaliculata Schw.). 



I. Bombay (Abercrombie). 



EissoiNA (Eissolina) pachystoma Melv. 



P.G. Bushire. 



I. Karachi. Bombay (Abercrombie), 

 The few ribs, eight on the body-whorl, and smooth interstices 



