RAPHITOMA ATTENUATA. 257 



representing rather var. tennicosta, Brugnone = B. volvula, A. Bell (see below). I 

 have several specimens of it, however, in my collection from Oakley, most of them 

 fragile and more or less imperfect ; probably it might be found elsewhere, if 

 especially looked for. 



Var. tenuicosta (Brugnone). Plate XXX, figs. 10, 11. 



1862. Pleiiroloma attenuatum, var. B, tenuicosta, Brugnone, Mem. Pleur. foss. Palermo, p. 25, 



fig. 17. 

 1871. Pleurotoma volvvli, A. Bell, Auu. Mag. Nat. Hist. [4], vol. vii, p. 358. 



1871. Pleurotoma attenuata, var. tenuicosta, Jeffreys iu Prestwich, Quart. Journ. Geol. Soc, vol. xxvii, 

 p. 494. 



1872. Plettrotoma attenuata, S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. i, p. 38, pi. iii, fig. 7. 

 1875. Raphitoina attenuata, var. tenuicosta, Seguenza, Boll. R. Com. Ceol. Italia, vol. vi, p. 210, no. 225. 

 1912. Pleurotoma attenuata, var. volvula, Tesch, Med. v. d. Rijks. v. Delfstoffen, pt. iv, p. 90, no. 233. 



Varietal Characters. — Differs from the type in its more slender form, its more 

 numerous and less prominent costge, its somewhat flatter whorls and rather longer 

 body-whorl and mouth. 



Dimensions. — L. 14 mm. B. 4 mm. 



Distrib'utiov. — Recent : Sicily. 



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

 Little Oakley. Scaldisien : Dutch borings at Grave-Oss. 



Upper Pliocene : Altavilla. Pleistocene : Ficarazzi. 



Bemarks. — ^The shell represented under this name is that described by Mr. 

 A. Bell in 1871 as a new species — Pleurotoma volvula. It was afterwards identified, 

 and I think correctly, hy Jeffreys Avith a Sicilian fossil from Ficarazzi, which had 

 been called by Brugnone in 1862 Pleurotomu attenuatum, var. tenuicasta. Mr. 

 Bell's fossils were considered by Wood also as a variety of B. a.ttenuata. I 

 understand this form was obtained rather abundantly some years ago in the 

 Coralline Crag of the celebrated Gomer pit at Gedgrave. Dr. Tesch has sent me 

 two or three specimens from beds believed by him to be Scaldisien, met with in one 

 of the Dutch borings at Grave-Oss. 



The present variety seems to me distinct and worthy of notice, occurring fossil 

 as it does on both sides of the Anglo-Belgian basin as well as in Sicily. 



Var. gracilior (A. Bell). Plate XXX, fig. 12. 



1871. Pleurotoma cjracilior, A. Bell, Ann. Mag. Nat. Hist. [4], vol. vii, p. 357. 



Varietal Characters. — Smaller and more slender than the type, with a long, 

 narrow mouth, and exceedingly fine spiral sculpture. 



33 



