414 



BULLID^:. 



centre, like that of C. nitidula : inner lip as in the last species : 

 pillar short and thick, furnished with a rather strong tooth- 

 like fold near the base ; it has a sharp curve to the left. 

 L. 0-125. B. 0-065. 



Var. conulus. Larger, narrower at the apex, and conical ; 

 the upper angle of the outer lip is higher and more projecting. 

 Bulla conulus, S. Wood, Crag Moll. pt. i. p. 173, pi. 21. f. 2 

 a-c. C. conulus, F. & H. iii. p. 517, pi. cxiv. c. f. 7. 



Habitat : With C. nitidula in the north, and south- 

 wards to Cornwall, as well as on our eastern and 

 western coasts, and in Ireland; local, but extensively 

 diffused. Of the variety a single specimen only has 

 occurred, and was dredged by me in Deal Voe, Shetland, 

 at a depth of about 10 f. ; it is not uncommon in the 

 Coralline Crag at Sutton (Wood), and in the Belgian 

 tertiaries (Nyst). The typical form is fossil in a post- 

 glacial deposit at Skien in Norway, 100 feet (Sars) ; 

 Bordeaux and Asti (Cantraine) ; and Italian tertiaries 

 (Brocchi and others). The geographical range of this 

 species is considerable, comprising the Scandinavian 

 coast, from the Loffoden Isles (Sars) to Bohuslan 

 (Loven and Malm), the oceanic shores of Trance (Recluz, 

 Tasle, and Cailliaud), Vigo Bay and Gibraltar (M'An- 

 drew), both sides of the Mediterranean (Cantraine and 

 others), the Adriatic (Brusina), and iEgean (Forbes) ; 

 depths 4-50 f. Weinkauff gives the variety conulus as 

 common at the entrance of and inside the harbour of 

 Algiers, in from 10 to 20 f. 



Differs from C. nitidula in being somewhat broader 

 in proportion to its length, and not so much attenuated 

 behind, being spirally striated instead of smooth, having 

 frequently a conspicuous epidermis, in the upper angle 

 of the outer lip not being so prominent, the apical 

 perforation being larger, and the columellar fold more 

 distinct. 



