640 PLIOCENE MOLLUSCA. 



Specific Characters.- — -Shell minute, ovato-conical, rather solid ; whorls 6, 

 rounded, not convex, the last sub-ventricose, two-thirds the total length ; orna- 

 mented by faint inconspicuous spiral strigs and by a few below the suture, the 

 upper two being- stronger, the others Avitli a dozen similar ones l)elow the periphery 

 and sometimes by faint or nearly obsolete longitudinal wrinkles; suture slight; 

 spire short, with a sharp point; mouth ovate, slightly angulate above; outer lip 

 thin; inner hp reflected on the pillar, peristome continuous. 



Dimensions. — L. 2'5 mm. B. 125 mm. 



Distribution. — Recent : British coasts, from the Outer Hebrides and Shetland, 

 littoral and laminarian zones. Norway. West European. Mediterranean, 

 Adriatic, Algeria. 



Fossil : St. Erth, Selsey, Bridlington, Largo Bay. Irish 

 estuarine clays. 



Pliocene : Cotentin (Dollfus). 



Pleistocene : Messina, Calabria, Livorno. 



Remarks. — This British species, ranging also from Norway to the Mediterranean, 

 has been reported l)y Mr. Bell from St. Lrth and Selsey, but it is unknown from 

 the East Anglian Crag. The Selsey specimen here figured is from the York 

 Museum, where it bears the name of R. senii^trinta. It agrees in form with the 

 typical shell, but its usual and faint sculpture is either obsolete or has been 

 removed by abrasion. 



Cingula bicarinata (A. Bell). Plate LI, fig. 37. 



1892. Rissoa hicarinata, A. Bell, Rep. Yorks. Phil. Soc, pp. 63, 67, 75, pi. i, fig. -23. 



Specific Characters. — Shell minute, elongato-conical, without scidpture; whorls 6, 

 but slightly convex, the last half the total length, having a doulde inconspicuous 

 ridge at the periphery, and below the suture ; suture well marked ; mouth oval ; 

 peristome continuous; outer lip thickened by a labial rib ; inner lip thin. 



Dimensions. — L. 3 mm. B. L5 mm. 



Distrihution. — Not recorded living. 

 Fossil : Selsey. 



Remarl-s. — The figure here given is from the unique specimen discovered by 

 Mr. Bell, now in the York Museum, and described by him in 1892 as a new species. 

 It is easily distinguished by the double angulation of the body-whorl. 



Cingula cingillus (Montagu). Plate LI, fig. 38, 



1803—08. Tiirho cingillus, Montagu, Test. Brit., pt. ii, p. 328, pi. xii, fig. 7, 1803 ; Suppl., p. 125, 1808. 

 1853. Bissoa cingillus, Forbes and Hanley, Brit. Moll., vol. iii, p. 122, pi. Ixxix, figs. 9, 10. 



1858. Cingula cingillus, H. and A. Adams, vol. i, p. 334, pi. xxxv, fig. 8. 



1859. Bissoa cingillus, G. B. Sowerby, 111. Ind. Brit. Shells, pi. xiii, fig. 26. 



