286 . PLIOCENE MOLLUSCA. 



to 30 fathoms (Friele), Lofoten Islands, Kara Sea, Siberian coast, Spitzbergen, 

 Iceland, Greenland, Labrador. 



Fossil : Waltonian Crag : Little Oakley. Icenian : Bramerton, 

 Postwick. Wexford gravels. 



Pleistocene: Bridlington, March, Middle Glacial sands of Billockby ; Labrador, 

 Spitzbergen, Greenland (Posselt). 



Remarks. — This small northern and Arctic species has not been recorded 

 hitherto from the Crag. I obtained a single specimen from Oakley, and it has also 

 been found at Bramerton. The Recent shell figured with the Crag fossil is from 

 the Stockholm Museum. B. exarata has been considered by Jeffreys, Prof. 

 Kobelt and some others as a variety of B. turrlmda, but it is regarded generally by 

 Scandinavian conchologists, and I think vritli reason, to be a distinct species. As 

 before stated, the typical B. turricula is not known to me from the lower horizons 

 of the English Crag. 



Bela mitrula (Loven). Plate XXXI, figs. 30, 31. 



1846. Tritonium mitrnla, Loven, K. Sveiisk. Vet.-Akad. Forh., vol. iii, p. 85. 



1878. Bela mitrula, G. O. Sars, Moll. Eeg. Arct. Norv., p. 233, pi. xxiii, fig. 9. 



1887. Bela mitrula, Kobelt, Martini unci Chemnitz, Conch. Cab., ed. 2, vol. iv (Pleurotoniidse), p. 158, 



pi. xxxii, fig. 13. 

 1896. Bela exarata, var. mitrula, Sparre Schneider, Tromsoe Mus. Aarsh., vol. ix, p. 29. 

 1905. Bela turricula mitrula, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iii, p. 241, pi. Ixxxii, 



fig. 12. 



Specific Characters. — Shell small or minute, ovato-fusiform, turreted, rather 

 thin ; whorls 6 — 7, strongly carinated, with a well-marked shelf below the suture ; 

 ornamented by numerous longitudinal costge which die out on the body-whorl, and 

 by spiral ridges — the upper one continuous, their intersection with the ribs giving 

 the shell a cancellate appearance — with slight granulations, especially on the keel ; 

 suture deep ; mouth short, rather wide, angulated above and by the keel ; canal 

 open, very short. 



Dimensions. — L. 8 — 12 mm. B. 4 — G mm. 



Distribution. — Recent : Norwegian coast, Finmark, Lofoten Islands. 

 Fossil : Icenian Crag : Bramerton. 



Remarks. — This form, regarded by Mr. Friele as identical with B. exarata and 

 by Dr. Sparre Schneider and others as a variety of that species, was known to 

 Prof. G. O. Sars from the Norwegian coast, but not from any locality further north 

 than Vardo or Hammerfest. The specimen from the Icenian Crag of Bramerton 

 now figured, which belongs to the Norwich Museum, appears to correspond with a 

 Recent shell I received from Canon Norman. Both of these are smaller than that 

 described by Prof. Sars. 



