﻿220 DEVONIAN FAUNA. 



The figure of the furrowed variety of Pileopsis prisca, Goldf., is very similar, 

 and perhaps represents the same species, though its furrows seem closer and 

 more numerous. His name, however, cannot be retained for the present species, 

 as it should be restricted to his tuberculated variety, which is quite distinct from 

 the present form. 



It is very similar to Acroculia contorta as described by F. A. Romer, which 

 bears somewhat similar spiral ridges, and may perhaps be a small variety of the 

 same species. Romer' s figures are, however, not sufficiently distinct to enable 

 us to be very certain about the identification. 



Clarke states that Trenkner's Gapulus deflexus is certainly the same as 

 A. vetusta, Phil, (not Sow.), and from his mention of spiral furrows it would seem to 

 belong to the part of his so-called species placed under the present head. Clarke's 

 own figure, as well as Trenkner's, however, does not show any spiral grooves, and 

 for that reason I was at first more inclined to place it with G. tylotus, n. sp., but 

 the shape of the mouth accurately agrees with Phillips's type, PI. XXII, fig. 6, 

 of Gapulus contortus, F. A. Romer (?), with which it is most likely identical. 



Affinities. — Gapulus disjunctus, Giebel, 1 is a closely allied species having similar 

 spiral marks, but it is distinguished by its much longer and more definitely coiled 

 spire, and its decidedly flatter shape. 



Pileopsis sinuosa, F. A. Romer, 2 has a much smaller and less recurved spire, 

 and is more flatly conical in shape. 



Platyceras priscum, var. undulatum, Barrois, 3 has a straighter and longer body- 

 whorl, and the spiral marks are geutle undulations rather than sharpish ridges. 



15. Capulus multiplicatus, Giebel. PL XXII, figs. 10, 10 a, 11, 11 a. 



1855. Acroculia haliotis, F. A. Romer. Beitr., pt. 3, p. 118, pi. xvi, fig. 8. 

 1858. Capulus haliotis, Giebel Sil. Faun. Unterharz., p. 22, pi. iii, fig. 5. 

 1858. — multiplicatus, Giebel. Ibid., p. 23, pi. iii, fig. 6. 



1878. — — Kayser. Abhandl. Geol. Specialk. Preuss., 



Band ii, pt. 4, p. 97, pi. xvi, figs. 



7—9. 

 1889. Acroculia multiplicata, Whidborne. Geol. Mag., dec. 3, vol. vi, p. 30. 



Description. — Shell large, depressed, wide, angulated. Spire very small, 

 recurved, tending slightly upwards, much depressed below the highest plane of 



1 1858, Giebel, 'Sil. Faun. Unterharz.,' p. 25, pi. iii, fig. 4 ; and 1878, Kayser, 'Abhandl. Geol. 

 Specialk. Preuss.,' Band ii, pt. 4, p. 95, pi. xvi, figs. 6, 6 a. 



2 1850, F. A. Bonier, ' Beitr.,' pt. 1, p. 33, pi. v, fig. 6. 



3 1882, Barrois, 'Mem. Soc. Geol. Nord.,' vol. ii, No. 1, p. 281, pi. xiii, figs. 3 a, b. 



