SCALA (CIRSOTRBMA) FlMBlllOSA. 513 



1890. Scalaria fiinhriosa, C. Reid, Plioc. Dep. Brit., p. 256. 



1891. Scalaria {Cimoirema) lamellosum, var. post-fiinhrioaa, Sacco, Moll. Terr. Terz. Piein., pt. ix, 

 p. 48. 



1896. Scalaria fimbriosa, Bernay.s, Bull. Soc. Belgo Gcol., vol. x (Mciuoires), p. 129. 

 1911. Scalaria Jimbriom, A. Bell, Jouru. Ipswicli Field Club, vol. iii, p. 16. 



Specific Characters. — Slicll imperforate, turriculate, tliick and solid; spire 

 elongate, regularly conical ; whorls convex, subdisjoined ; ornamented by longi- 

 tudinal costa3, lamelliform and reflected, of une(|ual size, irregularly varicose, and 

 by strong and rather distant spiral ridges, with others excessively fine in the inter- 

 spaces ; basal ridge well marked, crossed oblitpiely by the longitudinal cost a) ; 

 suture deep; mouth subcircular ; peristome thickened, continuous; outer lip wide, 

 varicose. 



Dimensions. — L. 30—40 mm. B. 13 — 16 mm, 



Distrlbntio)t. — Not known living. 



Fossil : Coralline Crag : Gedgrave, Sutton, Uamsholt, Boyton. 

 Waltonian : Walton-on^Naze, Beaumont, Little Oakley. Newbournian : Waldring- 

 field, Newbourn, Bentley. 



Bolderien (Van den Broeck), Casterlien (Bernays), Scaldisien (Nyst) : Belgium. 



Remarks. — This somewhat variable species is one of the most common of the 

 Crag Scalas. I have obtained more than 100 specimens of it from Oakley, most of 

 them, however, imperfect. 



It has been regarded by Jeffreys, Van den Broeck and Prof. Sacco as a variety 

 of the S. lamellosa of Brocchi, but their view has not been generally accepted. Its 

 most characteristic feature seems to be, that a varying number of the longitudinal 

 costffi are coarsely and irregularly varicose. In one specimen here given (PI. 

 XLVIII, fig. 1) there is one varix on each whorl, in others there may be 3 or even 6. 

 Very occasionally, such varices are absent as in PI, XLVIII, fig. 3. This is also 

 the case in the typical 8. Joniellosa, an imperfect specimen of which from the 

 Miocene of Antwerp I have here figured to show the points of resemblance and of 

 difference between the two forms. On the whole I follow AVood, de Boury and 

 others in regarding 8. fiinbriosa as a distinct species, peculiar to the Anglo-Belgian 

 deposits. . 



var. exfimbriosa (Sacco), Plate XLVIII, figs, 3, 4 



1881. Scalaria Jimhriosa, Nyst, Couch. Terr. tert. Belg., p. 89, pi. vi, fig. 18 b. 

 1891. Cirsotrema exfimbriosum, Sacco, Moll. Terr. Terz. Piein., pt. ix, p. 48. 



Varietal Characters. — Differs from the type form in size, its finer and more 

 cancellate sculpture and its less prominent varices. 

 Dimensions. — L, 24 — 26 mm. B. 10 mm. 

 Distribution. — Not reported living. 



