628 PLIOCENE MOLLUSCA. 



out on the body-whorl ; suture well uiai'kod l)ut not deep ; spire conical, ending in 

 a sharp point; mouth oblong, acutely angulate above, rounded and produced 

 below. 



Dimensions. — L. 8 mm. B. o mm. 



Distribution. — Recent : Poole (Jeffreys). Coasts of Provence. 

 Fossil : Selsey ; estuarine clays — Belfast. 



Bemarhs. — The specimen here figured was found l)y Mr. Bell in liis collection 

 of Selsey fossils. It is a special form and may be easily identified with Philippi's 

 shell. Originally described by that authority as specifically distinct, in which he 

 was followed by Carus, Locard and the authors of the Mollusca of Rousillon, it 

 was regarded by Jeffreys as a variety of B>. wemhrauacea. I venture to agree with 

 Philippi's view. 



Bissoa lineolata, Micliaud. Plate LI, fig. 7, 



1832. Rissoia lineolata, Micliaud, Descr. esp. Rissoa, p. 9, no. 5, figs. 13, 14. 



1844. Rissoa Ehrenbergi, Pliilippi, Euum. Moll. Sic, vol. ii, p. 127, pi. xxiii, fig. 9. 



1873. Rissoa lineolata, Weiiikauff, Cat. europ. Meercsconcli., p. 18, no. 289. 



1878. Rissoa lineolata, Monterosato, Enuni. e Sinon. Conch. Medit. (Giorn. Soc. Sci. Nat. Palermo, 



\ol. xiii), p. 83. 

 1884. Rissoa lineolata, Buoquoy, Dautzeuberg et Dollfns, Moll. mar. liouss., vol. i, p. 271, pi. xxxi, 



figs. 16—20. 

 1890. Rissoa lineolata, Carus, Prod. Faun. Medit., vol. ii, p. 318. 

 1892. Rissoa lineolata, Locard, Coq. nia-r. Cotes de France, p. 168. 

 1893—98. Rissoa Ehrenbergi, A. Bell, Proc. Roy. Irish Acad. [3], vol. ii, p. 629, 1893; Trans. Roy. 



Geol. Soc. Cornwall, vol xii, p. 151, 1898. 



Specific Characters. — Shell minule, ovato-oblong, thin ; whorls 7, slightly convex, 

 the last ventricose, much the largest; the upper whorls without sculpture, the 

 others ornamented by 14 — 18 longitudinal costa?, strong and rounded, reaching the 

 obtusely angulated periphery but not the base of the shell which is smooth, spiral 

 striations or ridges wanting; spire short, regularly conical, with an acute apex; 

 suture well-marked; mouth rounded. 



Dirn,ensions. — L. 4 mm. B. 2 mm. 



Distribution. — Recent : Mediterranean. 

 Fossil: St. Erth. 



Pliocene : Tuscany (Pantinelli). 



Remarks. — The specimen from St. Erth figured under this name is from the 

 British Museum, where it has been identified with the Rissoa Elirenbergi of Philippi 

 (q.v.), but the authors of the Marine Mollusca of Rousillon consider that E. Eliren- 

 bergi was founded on a young example of R. lineolata, Micliaud, whose name they 

 adopt, and this view has been followed by subsequent writers. 



