﻿186 DEVONIAN FAUNA. 



strias. Romer identifies that shell with Phasianella subdathrata, F. A. Romer, 1 

 which differs from our shell in its shortness, the apparent absence of an 

 umbilicus, the shape of the inner lip and of the body-whorl, and the possession 

 of longitudinal strias. It does not, I think, belong to the same genus, for the 

 possession of varices is almost the only point in common. 



Scalaria antiqua, Miinster, 2 is a much shorter shell, and has no varices. 



Loxonema rugiferum, Phillips, 3 ' Pal. Foss.' (not * Geol. Yorkshire'), appears to 

 be something of the same shape and to have a few varices, but it also has very 

 strong and numerous longitudinal ridges. 



Loxonema Igeve, F. A. Romer, 4 which according to Clarke 5 bears varices, differs 

 in having fewer and very much broader whorls. 



II. Family. — Littorinid^, Gray. 



1. Genus. — Littorina, Ferussac, 1821. 



I have had the advantage of submitting several of the Devonian shells 

 described below to Mr. E. A. Smith of the British Museum, and he agrees with 

 me that there is no reason for separating them from the recent genus. Of course 

 there is a possibility that these shells might be referred to the Turbinidae, 

 as it is impossible to say that they were not nacreous. But there is no reason 

 for supposing that they were so, and I know of no case in which a shelly 

 operculum that might belong to them has occurred in our Devonian rocks. 



1. Littorina devonica, Whidborne. PL XIX, figs. 5, ha. 



1889. Littorina devonica, Whidborne. Geol. Mag., dec. 3, vol. vi, p. 30. 



Description. — Shell small, fusiform, turreted, ovoid, turbiniform, of few (three 

 or four) volutions. Spire rather large, obtuse. Apex blunt. Suture obtuse and 

 shallow. Whorls convex, very rapidly increasing, ornamented with spiral lines 

 of nodules becoming ridges on the front part of the shell, crossed by numerous 

 close irregular growth-lines, tending obliquely backwards from the rear to the 

 front of the whorl. Ornament of the body-whorl consisting of a small high hem, 



* 1843, F. A. Romer, ' Harz.,' p. 31, pi. viii, fig. 15. 

 3 1839, Miinster, ' Beitr.,' pt. 1, p. 61, pi. xiii, fig. 1. 



3 1841, Phillips, ' Pal. Fobs.,' p. 101, pi. xxxviii, fig. 188. 



* 1850, F. A. Romer, ' Beitr.,' pt. 1, p. 35, pi. v, fig. 17. 



5 1884, Clarke, ' JVeues Jahrb. f. Min.,' Beil.-Band iii, p. 365, pi. v, fig. 12. 



