MELVII.L AND STANDEN : TEREBKA IN THE PERSIAN GULF. 215 



number, including the three nuclear, which are vitreous and very 

 smooth ; the rest are uniformly and elegantly costulate, with close, 

 acute, somewhat flexuose ribs, uninterruptedly running longitudinally 

 from suture to suture, and crossed by closely-arranged lirations of two 

 kinds, the finely linear alternating with those of double the width. 

 This species occurred extremely rarely. 



34-— Terebra (Mazatlania) nassoides Hinds. 



T. nassoides Hinds, Proc. Zool. Soc, London, 1843, p. 158. 



T. nassoides Reeve, Conch. Icon., xii., pi. xxvi., fig. 144, i860. 



T. {Euryta) nassoides Tryon, Man. Conch., p.. 38, pi xii., fig. 23, 

 1885. 



Hab. : P.G., Henjam Island, Jask, and other places on the Gulf of 

 Oman. M.C., Charbar, very general everywhere. 



A remarkably pretty small species, sometimes of an ivory whiteness, 

 at others straw-coloured excepting below the sutures where white pre- 

 vails, and ornamented with a median band of brown spots, with a 

 dark spiral band at the entrance to the mouth ; above, the riblets are 

 more conspicuous and frequent. 



Euryta H. and A. Adams, 1853, being pre-occupied. Dr. W. H. Dall 

 has changed the name of the sub-genus to Mazatlania. 



35. — Terebra (Mazatlania) thyrsea Melvill. 



T. {Euryta^ thyrcea Melvill, Mem. and Proc. Manchester Lit. and 

 Phil. Soc, vol. xii., part iii., p. 10, pi. vi., fig. 13, 1897. 



T. {Euryta) thyrcea Melvill and Standen, Proc. Zool. Soc, London, 

 1901, part I, p. 429. 



Hab. : P.G., Koweit (a much attenuate form). M.C., Charbar, 5 

 fathoms, sand. I., Karachi, among loose stones and sandy mud, 

 3-5 fathoms. 



We quote from the remarks appended to the original Latin de- 

 scription. 



Long., 12 mm. ; lat., 3*4 mm. 



This is a very elegant, chaste species, and quite an outlying form 

 of the genus, being most allied to T. {Euryta) brazieri Angas from 

 Australia and T, pulchella A. Ad. It is almost an Olivella in shape, 

 graceful, attenuate, white, with interrupted brown banding or spotting, 

 eight-whorled, two (apical) being transparent, the remainder obscurely 

 longitudinally obliquely ribbed, and irregularly sulculose ; aperture 

 straight, narrow, outer lip simple, columella straight. The name is 

 derived from Ovpalo'i, outside, from its characters when compared to 

 the majority of the genus. 



N.B. — We are uncertain whether the true T. polygyrata Desh. is 

 found in this region. An authenticated specimen received by J. CM. 



