﻿CAPULUS. 205 



species, the only difference in them being that the basal depression is rather less 

 marked than in Mr. Vicary's fossil. 



Pileopsis lineata, Goldfuss, 1 seems to have a larger spire and a more obliquely 

 shaped mouth, and has no spiral groovings ; but for Mr. Vicary's specimen, how- 

 ever, which shows the different style of ornament, I should have regarded it as 

 belonging to this shell. 



Gapulus Kahlebergensis, Beushausen, 2 is very similar in shape, but the longi- 

 tudinal stria?, or growth-lines, have a totally different curvature. 



Gapulus crassus, Trenkner, 3 is, as shown by Beushausen,* a more globular form, 

 with an asymmetrical spire and convex base. 



Gapulus immersus, Barrande, as given by Maurer, 5 has a smooth surface 

 marked only by fine undulating growth-lines, and does not appear keeled on the 

 back. Maurer notices its black colour. 



Pileopsis neritoides, Phillips, 6 is a very similar shell, but has a much more 

 rounded base, and strong, irregular, longitudinal striee. That species, as given by 

 Barrois 7 from the Asturias, is very much flatter than Phillips's type, but Dr. 

 Barrois thinks that this flatness may probably have been caused by pressure in 

 the course of fossilization. 



2. Capulds pericompsus, n. sp. PI. XX, figs. 1 — 5. 



1880. Capulxjs bostrattjs, " Barrande ?" Maurer, Neues Jahrb. f. Min., Beil.- 



Band i, p. 33, pi. ii, fig. 16 (not 

 Trenkn., Palaon. Novitat., pt. 1, 

 p. 12, pi. i, fig. 32). 



1887. Plattcebas, sp., Tschernyschew. Mem. Com. Geol. Buss., vol. iii, No. 3, 



p. 39, pi. vi, figs. 6 a — c. 



Description? — Shell small, depressed, very narrow, and elongate. Spire very 

 small, less than a volution, free except at the apex, very distant from the plane 

 of the mouth, much overhanging the inner margin of the mouth, and much 



1 1844, Goldf., ' Petref. Germ.,' vol. iii, p. 9, pi. clxviii, figs. 2 a, b. 



2 1884, Beushausen, 'Abhandl. Geol. Specialk. Preuss.,' Band vi, pt. 1, p. 53, pi. i, figs. 14 a, b. 



3 1867, Trenkner, ' Palaont. Novit.,' ii, p. 6, pi. v, fig. 1. 



4 1884, Beushausen, ' Abhandl. Geol. Specialk. Preuss.,' Band vi, pt. 1, p. 52, pi. i, figs. 13 a, b. 



5 1880, Maurer, ' Neues Jahrb. f. Min.,' Beil.-Band i, p. 33, pi. ii, fig. 15. 



6 1836, Phillips, « Geol. Yorks.,' pt. 2, p. 224, pi. xiv, figs. 16—18. 



7 1882, Barrois, ' Mem. Soc. Geol. Nord,' vol. ii, No. 2, pi. xiii, figs. 11 a—c. 



8 In describing these shells I have treated them, for the sake of uniformity, as ordinary Gasteropoda, 

 regarding the mouth as perpendicular, and the spire as approximately horizontal. 



