CEEITHIOPSIDES EROM THE NOETH ATLANTIC. 91 



S.ab. Plymoutli, Guernsey, Cornwall, in England ; Antrim in 

 Ireland ; Yillafranca {Jeffreys), Sicily, Naples, in the Mediterra- 

 nean. Fossil in the Tertiaries of Calabria {Monterosato) . 



(3) C. cosTTJLATA, Moller, Kroyer's TidssTcrifi, vol. iv. p. 83, 

 1842 (Turritella). 



This species is broad, stumpy, and little like a Cerithiopsis : 

 the whorls are convex, the suture impressed ; the longitudinal 

 ribs are strong, the spiral threads feeble and few ; the flatly 

 conical base is levelled up so as to hide both ribs and threads, 

 but is scored by faint convex lines ; the edge of this raised 

 flat forms a strong circumbasal thread ; round the base of the 

 pillar twists an almost obsolete thread, the scar of the old canal. 

 The apex is cylindrical, and consists of three convex short 

 broadish nearly equal whorls, of which the first two are doubt- 

 fully fretted with very faint microscopic spiral scratches, and 

 the third has besides about twenty-five very fine, barely convex, 

 unequally parted riblets : the extreme tip is subtumid, but not 

 prominent. 



Sah. Grreenland (Morcli), in 1622 fathoms {Wallich), to Fundy 

 Bay (Ferri7Z); Iceland (Torrell); Norway, from the North Cape 

 in 80 to 300 fathoms (Sars), to S. Sweden and Shetland, 84-86 

 fathoms (Jeffreys). Fossil in the Post-tertiaries of Scotlajid and 

 Sweden. 



(4) C. Baeleei, Jeffr. Brit. Gonchol. iv. p. 268. 



Is broad and conical, with a large but rather shallow suture ; 

 the ribs and spiral threads are nearly equal, and their inter- 

 sections are not very strongly tubercled. The apex, though it 

 has about half a whorl more, is very like that of C. fayalensis, 

 having the extreme tip smooth, and the succeeding whorls longi- 

 tudinally ribbed ; but in C. Barleei these riblets, of which there 

 are about thirty on each whorl, are very fine, like hairs, and 

 their interstices are microscopically fretted with very faint spiral 

 scratches. The first regular whorl has three spiral threads which 

 cross longitudinal ribs very like themselves. In G.fayalensis the 

 apex is slightly shorter than in C. Barleei, the longitudinal riblets 

 are stronger, less superficial, fewer (about twenty to a whorl), 

 and though oblique they are less so than in G. Barleei. The 

 first 1| regular whorls have only two spiral threads crossing longi- 

 tudinal riblets which are stronger than in G. Barleei. The suture 



throughout is less strong and open. 



7# 



