1901.] MOLLESKS FROM THE PERSIAN GULF. 417 



The principal distinguishing characteristic, however, lies in the 

 protoconch, extended in one of our specimens over no less than 

 five whorls, these beins; uniformly vitreous, shining, smooth, 

 gradate, and embellished with two acutely formed close spiral keels, 

 just below the centre. In one specimen, however, complete 

 smoothness prevails. P. roseatus Hinds and probably all the 

 genus possess large apical whorls, glassy, often once carinate below, 

 but none, that we have ever seen, to the same extent, in proportion 

 to the magnitude of the shell, as this small white species. Another 

 character lies in the alveolation of the interstices between the ribs 

 and spiral lira?, which juvenile P. roseatus, from the same seas, 

 does not possess. The specimen figured is in the collection of 

 Mr. W. N. Sturt. 



Phos mttriculatus Grid. 



I. Karachi. 



Phos roseatus Hinds. 



P.Gr Gulf of Oman, near Maskat. 7-40 fathoms. Those 

 from deep water lighter-coloured ; all occur amongst shell and 

 growth of Algae, &c, on the telegraph-cable that had been lying 

 for some period on a muddy bottom. Also in shoal water amongst 

 loose rocks, weed, coral, and sandy mud. Here several specimens 

 were of an unusually dark colour. Small examples, very charac- 

 teristic, were dredged, lat. 2-4° 55' N., long. 57° 59' E., at 37 

 fathoms in the Gulf of Oman. 



Latruxculcs spiratds (Lam.). [Eburna Lam. 1822 non 1801.] 

 I. Karachi {Major Baker). Bombay (Abercrombie). Bombay 

 southwards to Goa (Lt.-Col. H. D. Olivier). 



Latrexceles valextiaxes (Swains.). 



Eburna moUiana Chemn. 



M.C. General, and sometimes very fine. 

 I. Karachi. 



This species lives some distance down in the mud, in two or 

 three feet of water, only coming up in the evening to feed upon 

 defunct Medusa, Sec. They have been observed to emerge from 

 their holes, go to their prey some distance away, feed, and then 

 return to the sum hole. The mud they Frequent is of a soft 

 sponjry nature and largely micaceous, but it is probable that they 

 live iu the sand below the upper stratum, which is, as a rule, from 

 one to three Feel in depth ( /■'. W. T.). \ fine specimen measures 



34 x - '. inches. 



Earn. Ti ubi m.u.iii.i . 

 I i ki:in mi. \ k \i'\ ( rmel. 



I. Karachi. The ('hank shell i< occasicnallj bauled up by the 

 harbour dredg 



M i.i.c.nm.n \ Bl < BPH u.\ Lam. 



I. Karachi. On muddy rocks at lou lide. 



I'...., . Zool. Boo.— 1801, Vol. II. .\u. XXI II. 27 



