﻿HOLOPELLA. 229 



can be judged from its figure, it appears to be specifically identical with our 

 Lummaton fossils. Phillips's figure conveys rather a different impression, but it 

 is only a copy of Sowerby's. There seems no reason for supposing that Holopella 

 tenuicostata, Sandberger, is distinct, although it certainly differs in possessing a 

 few distant spiral threads. In general shape, and in the breadth of its whorls, it 

 corresponds. Goldfuss's Melania antiqua also exactly corresponds with our figure. 



H. Hennahiana is distinguished from the other species which accompany it in 

 Devonshire by the directness of its longitudinal striae. 



Affinities. — Turritella lineata, Miinster, 1 is separated by the possession of 

 broader whorls, a deeper suture, and somewhat coarser striae. 



Loxonema multiplied turn* F. A. Roiner, is very similar, but more subulate, 

 with broader whorls and only about thirty striae (Romer says sixteen, but figures 

 more) to a whorl. 



Loxonema ranellseforme, F. A. Romer, 3 appears only to differ in the possession 

 of varices. 



Loxonema subtilistriatum, (Ehlert,* is a much more elongate form with narrower 

 whorls, but the shell figured under this name by Barrois 5 more nearly approaches 

 ours, and I should be inclined to class it with if, rather than with (Ehlert's shell, 

 were it not for its greater number of whorls (ten). 



5. Holopella costata, Sandberger. PI. XVIII, figs. 15, 15 a. 



Melania costata, Goldfuss, MS. 

 1853. Loxonema costatum, Sandberger. Verst. Ehein. Nassau, p. 230, pi. xxvi, 



figs. 11, 11 a. 



Description. — Shell small, somewhat elongate, conical, of many whorls. Sutural 

 angle small, constant. Suture moderately deep and wide. Whorls five or six, 

 narrow, about half their diameter in height, evenly convex. Ornamentation con- 

 sisting of very numerous, fine, close, straight, regular, subacute, transverse stria?, 

 sloping obliquely backwards over the whorl from the upper suture, barely visible 

 to the naked eye, and becoming very irregular upon the body-whorl. Body-whorl 

 rounding-in suddenly below to form a comparatively flat base. 



Size. — Height 18 mm., width 9 mm. 



1 1840, Miinster, 'Beitr.,' pt. 3, p. 89, pi. xv, figs. 21a, b. 



2 1850, F. A. Eomer, ' Beitr.,' pt. 1, p. 16, pi. iii, figs. 16 a, b. 



3 1850, F. A. Eomer, ' Beitr.,' pt. 1, p. 35, pi. v, fig. 14. 



* 1887, (Ehlert, ' Bull. Soc. d'Etud. Sci. d'Angers,' p. 12, pi. vii, figs. 1, 1 a. 

 5 1889, Barrois, ' Faun. Calc. d'Ebray,' p. 222, pi. xv, fig. 13. 



