1901.] MOLLUSKS FROM THE PERSIAN GULP. 395 



CnreuidVA spina Crosse & Fisch. 



I. Karachi. Much rarer than the last. 



Odostomia antelia Melv. 



P.G. Gulf of Oman, lat. 24° 49' X., long. 55° 56' E. 225 



fathoms, mud. 



I. Karachi, very rare. Bombay (Abercrombie). 



Odostomia carixata H. Ad. 

 P.O. Bushire. 



1. Karachi, off mud at anchorage. 



Odostomia eutropia Melv. 



P.G. Bushire ; lat. 26° 23' X., long. 54° 53' E. 250 fathoms. 



M.C. Charbar. 



I. Karachi, on mud in 25 fathoms. 



Very near to two of Adams's Japanese species, 0. suba,ic/ulata 

 and 0. tenera, especially as concerns the body-whorl and carination, 

 but differing in the shape of the mouth. 



Odostomia litiopina, sp. n. (Plate XXIII. fig. 1.) 

 O. testa parva, subrimata, Icevi, tenui, semipdlucicla, cornea; an- 

 fractibus 44, quorum 1^ apicales, laves, nigrescentes, cceteris ad 

 suturas gradatulis, ventricosis, ultimo oblongo, tumidulo ; apertura 

 ovata, labro tenui; columella haud incrassata, uniplicata. 

 Long. 2, lat. 1 mm. 



Hab. Gulf of Oman. Lat. 25 ; 24' X., long. 57° 27' E. ; at 241 

 fathoms. Also lat. 25° 31' X., long. 57° 14' E. ; 198 fathoms, mud. 



A very minute and somewhat obscure species. It appears to 

 have nearly attained its full growth, though the peristome is still 

 thin. Theprotocouch does not seem heterostrophe, though slightly 

 involved ; the whorls are tumid, thin, olivaceous ; mouth oval ; 

 columella once-plaited. It is superficially not unlike a Litiopa, 

 whence the specific name. 



Odostomia major, sp. n. (Plate XXIII. fig. 2.) 

 0. testa oblonga, l<:eui, nitida, alba, apud apicem paullum attenu- 

 ate! i anfractibus nor, ,,i, apicali Icevi, vitrea, heterostropho, cut, ris 

 planatis, infra suturas zona eubpeUueida interna decoratis, 

 ultimo <i ti friici". obecurUrime tub lente epiraliter albostriato; 

 apertura paullum effusa, uvula, intus striata: labro eontinuo, 

 tenuis columella for titer implicata. 

 Long. •''. /"'. 2 mm. 

 Ilai,. I. Karachi. 3 fathoms. 



Not so frequent as 0. eutropia Melv., which occurs in the Bame 

 locality. It is amongst tin- largest of the genus, and also distin- 

 guished by i'> < » I > 1 < ) 1 1 <_ r . attenuatel] fusiform shape perfect smooth- 

 ness, and aperture slightly effuse, striate within, three apical BtricB 

 showing semipellucently through on the body-whorL There are 

 do signs of peripherial carination. 



