﻿212 DEVONIAN FAUNA. 



7. Capulus coedatus, Whidbome, sp. PI. XXI, figs. 1, 1 a. 



1889. Metoptoma cordata, TVhidborne. Geol. Mag., dec. 3, vol. vi, p. 30. 



Description. — Shell rather small, depressed, transversely conical. Spire very 

 small, free, consisting of about one-half of a volution, moderately convex exter- 

 nally, very concave within. Apex minute, sharp, recurved, below the median line 

 of the shell, and tending slightly downwards. Whorls increasing with extreme 

 rapidity ; in section, flatly and obliquely convex above, rapidly rounding so as to 

 be almost keeled on the median line, and then turning in with a slightly concave 

 curve on the lower part ; inner side very concave. Mouth very large, obliquely 

 heart-shaped or subtriangular. Peristome undulating, flatly expanded nearly all 

 round. Perpendicular from apex falling near, but well within, the inner margin 

 of the mouth. 



Size. — Height 14 mm., width 19 mm., distance of the apex from the plane of 

 the month 5 mm. 



Locality. — There is a single specimen from Wolborough in the Museum of 

 Practical Geology. 



Remarks. — This shell seems distinguished by its very large expanded mouth, 

 by its free, acute, and slightly recurved apex, by its almost keeled back, and espe- 

 cially by the extension of the inner side of the mouth beyond the perpendicular 

 let fall upon it from the apex. It is unfortunate that it is represented by only a 

 single specimen, as it becomes very difficult to decide how far the peculiarities in 

 its shape may be due to the accident of the individual, but these are so numerous 

 and so marked that it seems impossible to unite it with any of the accompanying 

 species. I was at first inclined to place it with the shell next to be described, but 

 the shape and freedom and position of its apex seem to prove that it cannot 

 belong to that species. 



Affinities. — In Metoptoma joileus, Phillips, 1 from the Carboniferous Limestone, 

 the apex is more elevated, and the proximal corners of the mouth more angulated. 



Pileopsis cassideus, d'Arch. and de Vera., 3 has a sharp median keel, a rather 

 greater spire, and a smaller mouth. 



1 1836, ' Geol. York.,' vol. ii, p. 224, pi. xiv, fig. 7. 



2 1842, d'Arch. and de Vera., ' Geol. Trans.,' ser. 2, vol. vi, pt. 2, p. 366, pi. xxxiv, fig. 10. 



