from the Persian G\Of^ ctv. 9 



smootli, not shining, microscopically delicately spirally strio- 

 late, with flattened nuclear whorls and apex, the remaining 

 whorls decidedly ventricise. Body-whorl to some extent 

 prolonged, mouth ovate ; peristome continuous, slightly 

 thickened. 



Ohtori.io elongellci, sp. n. (PI. I. fig. 14.) 



0. testa anguste oblonga, parva, alba, dulicata ; anfractibu9 10, 

 quorum 3 apicales, apice ipso parvo, rufo, laivi, deinde duobus 

 rufo-tinctis, ceteris albis, apud suturas impressis, multum ventri- 

 cosis, longitudinaliter, simul ac spiraliter, decussatim ruguloso- 

 liratis ; apertura ovata, peristomate tenui, fere continuo, colu- 

 mella paullum excavata. 



Loug. 4, lat. 1*25 mm. 



Ilab. Mekran Coast, off Charhar. 



A small elongate shell, narrower but of the same calibre 

 as Styliferina fuJva *, Wats., which is placed by Mr. C. 

 Hedley in his genus Obfortio'f, in company with Rissoa 

 pyrrhacme \, M. & St., and the lately described 0. vulnerata, 

 Hedley §. It comes nearest to 0. fidva, but is much the 

 same size and contour as 0. vulnerata. 



The type of this genus was described by myself in collabo- 

 ration with Mr. Standen, as has just been observed, as a 

 /^i'.ssoa, and subsequently tentatively considered an Alaha\\. 

 Later both Hedley and Dall ^ placed it among the Pyrami- 

 dellidse, but the lormer author, finding the nuclear whorls 

 non-heterostrophe, has again transferred it to the Rissoidte. 



This interesting species {0. pyrrhacme) I now have in my 

 collection from Mauritius (TK Moss), from the Persian Gulf 

 [Towusend), and Bombay (Ahercrombie) , likewise from 

 I3ydong Cays [Haddon], and Thursday Island, Torres Straits 

 {A. K. Uenn); and it aj)pears to me not to vary at all, ex- 

 cepting a degree in size, from any of these places and to be 

 quite distinct from O.fulva (Wats.), with which some authors 

 are inclined to associate it. 



* Bep. * Challenger ' Exped. xv. p. 571, pi. xlii. fig. 5 (1886). 

 t Hedley, Moll, of Funafuti, Alsiu. Austral. Mus. iii. p. 412, fie. 6 

 (1899). 



X Journ. Conch, viii. 1896, p. 310, pi. xi. fig. 70. 



§ Proc. Linn. Soc. N.S.W. 1909, xxxiv. p. 439, pi. xl. fig. 52. 



II Journ. Linn. Soc. Lend., Zool. xxvii. p. 170 (1899). 



^ Dall & Bartsch, Mon. W. Am. Pyramidellid Mollusks, p. 16 (1909). 



