﻿158 DEVONIAN FAUNA. 



crenulated within. Inner lip straight, continuous, thickened, elevated, bearing on 

 the side of the aperture two distinct rounded teeth, which seem to be continued as 

 ridges within the shell. Shell-structure massive. 



Size. — Height 13 mm., width 10 mm. 



Locality. — There is a single specimen from Chudleigh in the Woodwardian 

 Museum. 



Remarks. — This small shell is somewhat crushed, but otherwise it is in a 

 beautiful state of preservation. I am not certain whether a shell which I have 

 seen in Mr. Champernowne's collection belongs to the same species, but otherwise 

 I know nothing else like it from the present localities. The dentition of the 

 mouth is peculiar. 



Affinities. — Externally it comes very near to Turbo mutabilis, F. A. Romer, 1 

 but it has more numerous spiral ridges and a much smaller apical angle, and is 

 generically separated from it by the teeth of its inner lip. 



From Gyclonema Guillieri, (Ehlert, as given by Barrois, 2 it differs in the shape of 

 its mouth, in its longer spire, smaller body-whorl, and strong longitudinal striae. 



Order.— PROSOBRANCHIA, Milne Edwards, 1848. 



I. Family. — Pseudomelaniid^, Fischer, 1887. 



1. Genus. — Macrochilina, Bayle, 1880. 



This genus comprises spirally ovoid or buccinoid shells, which are not 

 umbilicated, and have a slightly twisted or folded columella. It is either smooth 

 or longitudinally striated. Its mouth is ovoid, simple, and effuse below. It 

 extends from the Devonian to the Trias. 



It differs from Lo.vonema in its more ovoid shape, its fewer whorls, and its 

 folded columella. 



The genus was first established by Phillips in 1841 under the name 

 Macrocheilus ; but de Koninck 3 points out that that name had been previously 

 applied by F. W. Hope in 1838 to a group of insects. Therefore, although 

 Zittel and Fischer both retain Phillips's name, it appears necessary to follow 

 de Koninck in employing the term Macrochilina, which was proposed for it by 

 Bayle* at his suggestion. 



1 1850, F. A. Romer, ' Beitr.,' pt. 1, p. 3G, pi. v, fig. 21. 



2 1889, Barrois, ' Faun. Calc. d'Ebray,' p. 220, pi. xv, figs. 12 a, I. 



3 1881, de Koninck, ' Ann. Mus. Roy. H. N. Belg.,' vol. vi, pt. 3, p. 36. 



4 1880, Bayle, ' Journ. de Conch.,' ser. 3, vol. xix, p. 35. 



