568 PLIOCENE MOLLUSCA. 



Turbonilla (Pyrgostelis) varicula (S. V. Wood). Plate XLIX, fig. 26. 



18-48. Chemnitzia varicvia, S. Y. Wood, Mou. Crag Moll., pt. i, p. 84, pi. x, fig. 10. 



1871. Cerithmm variculum, Jeffreys iu Prestwich, Quart. Jouru. Geol. Soc, vol. xxvii, p. 143. 



1872. Cerithium variculum, A. and K. Bell, Proc. Geol. Assoc, vol. ii, p. 203. 



Specific Gharactevs. — Shell small, turreted, conical ; whorls slightly convex, the 

 last nearly half the total length ; spire elongate, regularly increasing in width ; 

 suture distinct ; ornamented l^y fine longitudinal costas not so wide as the inter- 

 spaces, tending to die out towards the base, and by fine, rather inconspicuous or 

 obsolete spiral lines ; mouth short, subcircular ; outer lip acute, smooth within. 



Dimensions. — L. 5 mm. B. 2 mm. 



Disfribiitiun. — Not known living. 



Fossil : Coralline Crag : Sutton. Waltonian : Walton-on-Naze. 



Remarks. — Of this very distinct form Wood states he had obtained about a 

 dozen specimens fiom the Coralline Crag of Sutton. There are several under the 

 same name in the York Museum from Walton, not exactly alike, one of them, at 

 least, coi'responding fairly well with Wood's type except that it is somewhat wider,, 

 and that the costge extend nearly to the base of the shell. Another described in 

 my next paragraph as a variet}' {expansa) has a still wider body-whorl and more 

 numerous ribs. 



Var. expansa, nov. Plate XLIX, fig. 27. 



Varietal Characters. — Somewhat larger and wider than the type, with rather 

 more numerous costal. 



Dimensions. — L. 5 mm. B. 2 mm. 



Distriljution. — Not known living. 



Fossil : A\^altonian Crag : Walton-on-Naze. 



Remarks. — The specimen here described as a variety of T. varicula departs stiD 

 more Avidely from Wood's type than does the one last described. It seems to 

 belong, however, to the same group. 



Turbonilla (Pyrgostelis) filosa (S. V. Wood). Plate XLIX, fig. 28. 



1842 — 72. Turbonilla fitom. S. Y. Wood, Auu. Mag. Nat. Hist. [1], vol. ix, p. 536, 1842 ; Cliemmtzia 

 filosa, Mou. Crag Moll., pt. i, p. 82, pi. x, fig. 7, 1848 ; 1st SuppL, pt. i, p. 60, 1872. 



1871. Odostomia filosa, Jeffreys iu Prestwich, Quart. Jouru. Geol. Soc, vol. xxvii^ p. 143. 



1872. Chemnitzia filosa, A. and E. Bell, Proc. Greol. Assoc, vol. ii, p. 203. 

 1881. Tnrhonilla filosa, Nyst, Couch. Terr. Tert. Belg., p. 74, pi. vi, fig. 4. 

 1890. Chemnitzia filosa, C. Reid, Plioc. Dep. Brit., p. 241. 



1896. Tu.rho7iillii filosa, Beruays, Bull. Soc. Belg. Geol, vol. x (Mcmoires), p. 129. 



1912. Turhonilla filosa, Tesch, Med. v. d. Rijks. v. Delfstoffeu, No. 4, p. 72, no. 169, p. 129. 



