GASTEROPODA. 155 



4. CAPULUS UNGARICUS. Linn. Tab. XVII, fig. 2, ag. 



var. a. VULGARIS, fig. 2, d, e, Red Crag, Walton. 

 ft, REGULARIS, 2, a, Cor. Crag, Ramsholt. 

 y, UNGUIS, 2, b, e, Red Crag, Sutton. 



, ELATA, 2, /, Red Crag, Sutton. 



PATELLA UNGARICA. Linn. Syst. Nat. p. 1259. 



HUNGARICA. Penn. Brit. Zool. t. 90, fig. 147. 



UNGUIS. J. Sow. Min. Conch, t. 139, fig. 7, 1816. 



UNGARICA. Turt. Conch. Diet. p. 140, fig. 76, 1819. 

 PILEOPSIS UNGARICA. Brown. Illust. Brit. Conch, pi. 37, fig. 19-20, 1827. 



Lam. Hist, des An. sans Vert. 2d edit. torn, vii, p. 609, 1836. 



Dujard. Me"m. Soc. G6o\. de France, t. 11, pt. 2, p. 274, 1837. 



Nyst. Coq. foss. de Belg. p. 355, pi. 35, fig. 8, 1844. 

 CAPULUS HUNGARICUS. Flem. Brit. An. p. 363, 1828. 

 CAPULUS UNGARICUS. G. Sow. Genera of Shells. 



8. Wood. Catalogue 1842. 



Morris. Catal. of Brit. Foss. p. 141, 1843. 

 PILEOPSIS UNGARICA. Thorpe. Brit. Mar. Conch, p. 135, 1844. 



C. Testa variabili, stepe orbiculato-conicd, acuminatd; longitudmaliter striatd ; vertice 

 hamoso, involute ; aperturd transversim plerumque latiore. 



Shell conical and acuminated, with a suborbicular base, generally wider than long, 

 sometimes longer than wide, longitudinally striated, with a hook-shaped or involute 

 vertex. 



Transverse diameter of base 2J inches. 



Locality. Cor. Crag, Sutton, Ramsholt, Gedgrave. 



Red Crag, Sutton, Walton, Newbourn, Bawdsey. 



Recent, British Seas. 



This is an exceedingly variable species : in one variety the cone is elevated with 

 little or no inflection of the vertex, while, in another, it is upon a level with the base. 

 In var. unguis, fig. 2, fr, c, the aperture is elongato-ovate, with the vertex recurved, 

 and hanging over the posterior margin. In var. elata, fig, 2 /, the vertex is nearly 

 central, with scarcely any curvature ; the more ordinary form has the base with the 

 transverse diameter the wider. In the depressed form which Mr. J. Sowerby has 

 described as P. unguis, the shell is slightly oblique, with an obtuse angular edge 

 upon the back. The striae are distinctly visible in all these varieties. The margin of 

 this species is frequently distorted, with a sinus or indenture, which is generally 

 on the dextral side. The ligulate band of its deeply-impressed muscle mark extends 

 over more than two thirds of the circumference, with large and obtuse terminations ; 

 these are equidistant on each side. In the oblique specimens they appear to be less 

 equal, in consequence of one side being more convex or extended than the other. 



