408 



SHELL forming a short spindle, thin, semitransparent, and 

 glossy : sculpture, minute, delicate, and rather close-set spiral 

 striae, which are more conspicuous at the extremities and in 

 young shells ; they are somewhat wavy, and slightly reticu- 

 lated by microscopic lines of growth : colour pale yellowish- 

 white, sometimes orange, and occasionally tinged with pink : 

 spire excentric, visible only in young shells, extremely short, 

 lying within the level of the upper canal ; it exhibits under 

 a strong magnifying-power a finely punctured appearance, 

 like the apex of Rissoa Jeffrey si : whorls, apparently a single 

 tumid one which envelopes all the rest ; in the young may be 

 counted 3 convex whorls, the first of which is blunt and 

 mammiform : suture in the early state of growth slight, 

 afterwards covered over : mouth large and wide, somewhat 

 expanding, of an irregular shape in consequence of the 

 periphery projecting into it ; it is narrower above than below : 

 upper canal semitubular, expanding outwards, and having 

 the inner side or wall more or less twisted, thickened, and 

 white : lower canal very short and broad, usually straight ; 

 notch obliquely but not deeply incurved : outer lip flexuous ; 

 edge plain and prominent, now and then thickened within : 

 pillar excavated or indented, and girded by a twisted ridge. 

 L. 1. B. 0-5. 



HABITAT : Coralline zone, on the coasts of Dorset, 

 Devon, and Cornwall; Guernsey (J. G. J.); co. Gal- 

 way (Barlee); Macgilligan, co. Londonderry (Mrs. R. A. 

 Hyndman, fide Thompson) ; Turbot bank, co. Antrim 

 (Waller) ; Sound of Mull (Bedford) . Mr. Horace Mar- 

 ryat found it living among tufts of Tubularia indivisa, 

 in the Gouliot caves at Sark, at low water. Laskey 

 gives " Porto-bello sands ; " but such a locality seems 

 improbable. M. Martin has taken this species in the 

 Gulf of Lyons, regarding it as the young of O. carnea 

 (Bulla carnea, Gmelin), of which the 0. Adriatica of 

 Sowerby is perhaps a variety. 



If the present species should prove to be also a variety 

 of O. carnea (which differs only in its outer lip being 

 inflected and the edge notched) , Pennant's name patula 



