BELA PYRAMIDALIS. 295 



the surface of the shell ; spire varying in length but generally short, regularly 

 tapering, not turreted or scalar ; suture slight, but little oblique ; mouth ovato- 

 oblong, ending in a short and open canal ; outer lip obtusely angulated by the keel ; 

 inner lip forming a rather wide glaze upon the pillar. 



Dimensions. — L. 10 — IG mm. B. 5 — 8 mm. 



Distribution. — Recent : northern coasts of Great Britain, Hebrides, Shetland 

 and Orkneys, Dogger Bank. Norway from the Christiania Fiord to Finmark, 

 Lofoten Islands. White Sea, Spitzbergen, Iceland, Newfoundland, Greenland, 

 Gulf of St. Lawrence, Massachusetts, west coast of North America (P. Carpenter). 

 Fossil : Waltonian Crag : Walton - on - Naze, Little Oakley. 

 Newbournian : Sutton, Waldringfield, Felixstowe. Butleyan : Hollesley, Butley. 

 Icenian : Bramerton, Aldeby, Bulchamp, Thorpe (Suffolk), Aldeburgh. Iceland. 



Pleistocene: Bridlington, common in the Clyde beds and elsewhere in Scotland, 

 less so in Ireland ; Uddevalla, Murman coast, Christiania region, Norway, and 

 Canada; Gulf of Gascony (Dautzenberg and Fischer). 



RemarliS. — B. Trevelyana, a British species with an extended range principally 

 northern, extending from Spitzbergen to the Avest coast of North America, is found 

 at all horizons of the English Crag from the Waltonian to the Icenian. It is widely 

 diffused also in the Pleistocene deposits of this country and of other northern regions. 

 It may be easily distinguished from most other Crag Belas by its fine, inconspicuous 

 and decussate sculpture. I have two specimens from Oakley, one 10 mm. and the 

 other 16 mm. in length ; the first of these represents the size of the typical British 

 form. 



In the Crag specimens both the sculpture and the keel are sometimes nearly or 

 quite obsolete (possibly worn), especially on the lower whorls. 



Bela pyramidalis (Strom). Plate XXVIIl, fig. 1 ; Plate XXXII, figs. 1, 2. 



1788. Buccinum pyraviidale, Strom, K. Dauslc. Vid. Selsk. Skrift., vol. iii, p. 297, fig. 22. 

 1838. Fusus pleurotomarias, Couthouj, Boston Journ. Nat. Hist., vol. ii, p. 107, pi. i, fig. 9. 

 1842-70. Bela pleurotomaria, Gould, Eep. Inv. Mass., ed. 1, p. 290, fig. 192, 1842 ; ed. 2, p. 355, 



fig. 625, 1870. 

 1846. Tritonium pyramidale, Lovl'u, Kongl. Sveusk. Vet.-Akad. Forh., vol. iii, p. 145. 

 1869. Pleurotoma {Bela) pyramidalis, Morch, Aun. Soc. Malac. Belg., vol. iv (Memoires), p. 22. 

 1872. Bela pyramidalis, Dawson, Canadian Nat., new ser., vol. vi, p. 391. 

 1878. Bela pyramidalis, G. O. Sars, Moll. Reg. Arct. Norv., p. 222, pi. xvi, fig. 3. 

 1884. Bela pyramidalis, Morch and Poulsen, MS. list in Geological Museum, Copenhagen, no. 33 



(unpublished). 

 1886-1901. Bela p>yram{daUs, Friele, Norske Nordh. Exped. (Mollusca), pt. ii, p. 22, 1886; pt. iii, 



p. 94, 1901. 

 1887. Bela pyramidalis, Kobelt, Martini und Chemnitz, Couch. Cab., ed. 2, vol. iv (Pleurotomidse) , 



p. 159, pi. xxxii, figs. 14, 15. 



