418 PLIOCENE MOLLUSCA. 



points of contact; suture distinct but not deep; mouth oval, angulate above; base 

 rounded. 



Dimensions. — L. 10 mm. B. 3 mm. 



Distribution. — Not known living. 



Fossil: Waltonian Crag : Little Oakley. 



Scaldisien : Antwerp. 



Remarks. — 1 have half a dozen specimens from Oakley of what seems to me a 

 distinct form. It is a strong shell, with coarse sculpture. When examining 

 M. van de Wouwer's collection at Antwerp I noticed some examples from the 

 Scaldisien of what was evidently the same species. He was kind enough to give 

 me a specimen which I have here figured under the above name, together with one 

 of my Oakley fossils. 



Bittium punctulum (S. V. Wood). Plate XLI, figs. 5, 6. 



1842-79. Cerithium punctulum, S. V. Wood, Aim. Mag. Nat. Hist. [1], vol.ix, p. 538. 1842 ; G. vari- 

 culoswm (non Nyst), Mon. Crag Moll., pt. i, p. 69, pi. viii, fig. 3, 1848 ; 2nd Suppl., p. 23, pi. ii, fig. 15, 

 1879. 



1871. Cerithium reticulatum, var., Jeffreys in Prestwich, Quart. Journ. Geol. Soc, vol. xxvii, p. 487. 



1872. Cerithium variculosum, A. and R. Bell, Proc. Geol. Assoc, vol. ii, p. 209. 



1874. Cerithium variculosum, Van den Broeck, Ann. Soc. Roy. Malac. Belg., vol. ix, p. 285. 



1881. Cerithium punctulum, Nyst, Concli. Terr. Tert. Belg., p. 77, pi. vi, fig. 8. 



1898. Cerithium reticulatum, var. punctulum {C. variculosum in plate), A. Bell, Trans. Roy. Geol. 



Soc. Cornwall, vol. xii, p. 144, pi. i, fig. 12. 

 1912. Cerithium punctulum, Tesch, Med. v. d. Rijks. v. Delfstoffen, no. iv, p. 76, no. 180. 



Specific Characters. — Shell small, slender, elongate, turreted ; whorls 10, 

 slightly convex, the last one-third the total length ; delicately ornamented by a 

 number of well-marked, closely-set longitudinal costas and by 4 spiral ridges which 

 are tuberculate at the points of contact ; spire attenuate, regularly diminishing in 

 size to a rather blunt point ; base rounded with 2 non-tuberculate ridges ; suture 

 fairly deep ; mouth ovate, angulate above ; outer lip thin ; canal very short. 



Dimensions. — L. 9 mm. B. 3 mm. 



Distribution. — Not known living. 



Fossil : St. Erth. Waltonian Crag : Walton-on-Xaze, Little 

 Oakley. Newbournian : Ramsholt. 



Scaldisien : Antwerp (Nyst), Dutch borings (Tesch). 



Remarks. — Some confusion still exists as to the correct nomenclature of this 

 species, Wood's type specimen in the British Museum being labelled Cerithium 

 variculosum. This by the kindness of Dr. A. Smith Woodward I am able to 

 figure ; the original drawing does not satisfactorily represent it. 



Originally given by Wood in his Catalogue of 1842 as C. punctulum, it was 



