SCALA (ROREOSCALA) STMIT.TS. 549 



1905. Scala grcenlandica, Kobelt, Icon, sclialentrag. europ. Meeresconcli., vol. iii, j). 25, pi. Ixii, fig. 1. 

 1917. Scalaria (jrwnlandica, var. crchrlcostatn, A. Bell, Naturalisf, lU). 72!3, [). 9(3. 



Varietal Ghdvacfers. — Shell larger than the typical Crag- form, with a much 

 broader base, a less slender spire, more tumid and ronnded whorls and a deeper 

 suture. Usually the longitudinal ribs are finer, less prominent, more numerous 

 and curved or sigmoid on the lower whorls, the spiral ridges being coarser and 

 more distinct. 



Dimennons. — L. 45 mm. B. 16 mm. 



Distribution. — Recent: Norwegian Coast between North Cape and Bear Island. 

 Greenland. Banks of Newfoundland. 



Fossil: Bridlington. Canadian Pleistocene : Riviere du Tioup. 



Remarks. — The large and ventricose form of 8. groevlandicu described by 

 Prof. G. O. Sars as var. crehricosfata, seems to have had a rather wide distribution 

 in circumpolar regions as a recent and Pleistocene shell, being reported as living 

 from Bear Island south of Spitzbergen, Finmark and Greenland, and as fossil from 

 the Riviere du Loup in Canada, as well as from Bridlington. While examining 

 Mr. Headley's collection from the latter place my colleague Mr. A. Bell noticed a 

 specimen of it, and I have since found another in the British Museum which I am 

 permitted to figure. It differs essentially from the ty[)ical Crag variety of /S*. 

 gramlamlica, which is a more slender shell having fewer longitudinal ribs. 



Scala (Boreoscala) similis (J. Sowerby). Plate XLVII, figs. 18-22. 



1812. Scalaria similis, J. Sowerby, Miu. Conch., vol. i, p. 49, pi. xvi, figs. 1, 2. 



1842-48. Scalaria similis, S. V. Wood, Ann. Mag. Nat. Hist. [1], vol. ix, p. 534, 1842 ; S. grcenlandica, 



Mou. Crag Moll., pt. i, p. 90, pi. viii, fig. 11a, 1848. 

 1871. Scalaria similis, Nyst, Ann. Soc. malac. Belg., vol. vi, p. 132, no. 277. 



1871. Scalaria grmnlandica (pt.), Jeffreys in Prestwicli, Quart. Journ. Geol. Soc, vol. xxvii, p. 491. 



1872. Scalaria grcenlandica, A. and E. Bell, Proc. Geol. Assoc, vol. ii, p. 210. 

 1890. Scalaria, grcenlandica (pt.), C. Raid, Plioc T>e\). Brit., p. 256. 



1912. Boreoscala grcenlandica, var. similis, Cossmahu, Ess. Paleoconcli. conipar., vol. ix, p. 54, pi. iii, 

 fig. 4. '* 



Specific Characters. — Shell belonging to the same group as 8. (jra-nJamlica, but 

 much stronger and more solid, with coarser and more prominent sculpture, more 

 convex whorls, a deeper suture and a less slender and elongate spire — generally it is 

 not varicose, and the basal ridge is more strongly marked. 



Dimensions. — L. 30 — tO mm. B. 12 — 15 mm. 



Distribnfion. — Not known living. 



Fossil: Coralline Crag: Boy ton. Waltonian : Little Oakley. 

 Newbournian : Holywell, Sutton, Newbourn, Waldringfield. Butleyan : Butley. 



Icenian : Bramerton. Wexford gravels. 



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