GASTEROPODA. 155 



4. Capulus ungaricus. Linn. Tab. XVII, fig. 2, a — g. 



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

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



y. unguis, 2, 6, c, Red Crag, Sutton. 



o, 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. Mem. Soc. Geol. de France, t. 11, pt. 2, p. 274, 1837. 



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

 Capulus Hungaricus. Mem. Brit. An. p. 363, 1828. 



Capulus ungaricus. G. Sow. Genera of Shells. 



— S. Wood. Catalogue 1842. 



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

 Pileopsis ungarica. Thorpe. Brit. Mar. Conch, p. 135, 1844. 



C. Testa variabili, sape orbiculato-conicd, acuminata ; longitudinaliter striata ; 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, 2\ 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, b, 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 stria? 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. 



