﻿CAPULUS. 211 



positively of the definiteness or limits of tlie species, but it appears to represent 

 one if not two forms distinct from those that accompany it. The large specimen, 

 PL XX, fig. 12, for instance, has a much more elongated spire, and I am in some 

 doubt whether it might be a variety of Gapulus contortus, F. A. Romer ?, as it has 

 some indistinct longitudinal markings, and its spire tends upwards ; but it is 

 crushed and a cast, and on the whole it seems better to leave it with the present 

 species. 



Affinities. — Acroculia trigona, F. A. Romer, 1 seems to resemble it in some 

 respects, and may possibly belong to the same species, though it has a larger and 

 contiguous spire ; but this species differs from Pileopsis trigona, Goldfuss, 2 which 

 is a highly conical shell, with hardly any signs of a spire. 



Gapulus conspicuus, Eichwald, 3 appears to be distinguished by having a less 

 elongate and recurved beak, and by the total absence of spiral undulations. 



6. Capulus terminalis, n. sp. PL XX, figs. 16, 16 a. 



Description. — Shell rather large, depressed, transversely conical. Spire very 

 small, elongate, much recurved, free (?), tending upwards, considerably distant from 

 the oral plane. Body- whorl subcircular or oval in section, flat on the inner side, 

 horizontally very convex with decreasing curvature. Mouth large, hardly if at all 

 sinuous. Surface unknown. 



Size. — Width 18 mm., breadth 28 mm., height 27 mm. 



Locality. — Lummaton. Two specimens in my Collection. 



Remarks. — It is rather doubtful whether this shell may not be only a variety of 

 Gapulus columbinus, but it seems at present needful to separate it from it on 

 account of its long and free spire standing at a greater distance from its mouth, 

 as well as the more tubular shape of its spire. In both cases the apex is rather 

 imperfect, but in this it was evidently much more elongated than in the other 

 species. The species appears to come midway between Capulus puellaris and 

 Gapulus columbinus. 



1 1843, F. A. Romer, 'Harz.,' p. 26, pi. xii, figs. 33 a, b. 



2 1844, Goldfuss, ' Petref. Germ.,' vol. iii, p. 9, pi. clxvii, figs. 17 a—c. 



3 1857, Eichwald, 'Bull. Soc. Nat. Moscov.,' p. 157; and 1860, Eichwald, ' Lethasa Rossica,' 

 p. 1103, pi. 1, tigs. 12 a, b. 



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