﻿162 DEVONIAN FAUNA. 



2. Macrochilina arculata, Schlotheim, sp. PI. XVI, figs. 8, 8 a, 9, 9 a. 



1820. Buccinites aeculatus, Schlotheim. Petrefacten-Kunde, p. 128, pi. xiii, 



figs. 1 a, b. 

 1842. Maceocheilus aeculatus, d' 'Archiac and de Verneuil. G-eol. Trans., 



ser. 2, vol. vi, pt. 2, p. 354, pi. xxxii, fig. 1. 

 1844. Buccinum arculatum, var. ventbicosum, toeostjm, and cabinatum, 



Goldfuss. Petref ., vol. iii, p. 29, pi. clxxii, 

 figs. 15 a, c, d, and e (only). 

 1844. — Oceani, Goldfuss. Petref., vol. iii, p. 29, pi. clxxiii, fig. 1. 



1849. Maceocheilus Oceani, d'Orbigny. Prodrome, p. 63. 

 1852. Buccinum aeculatum, Quenstedt. Handb. Petref., p. 416, pi. xxxiii, fig. 17. 

 1876. Maceocheilus aeculatus, F. Homer. Lethaea Pal., pi. xxxii, fig. 6. 

 1881. — — Zittel. Handb. Pal., pt. 1, Band ii, p. 239, 



fig. 320. 



Description. — Shell large, turriculated, fusiform, mucronate at the apex, more 

 or less inflated about the body-whorl, somewhat contracted at the base. Spire 

 consisting of about six or seven broad, slightly convex volutions. Suture shallow, 

 facing upwards. Whorls rising from the suture to form a small rounded or 

 flattened shoulder, and thence proceeding downwards in a slightly convex curve. 

 Aperture ovate, narrow, very contracted above. Inner lip covered by a wide 

 flattened callosity, which is keeled above and extends round the columella. Body- 

 whorl occupying about two-thirds the height of the shell, shouldered above, 

 flattened or slightly convex in the upper parts, and becoming rather suddenly 

 convex below. Shell-structure rather thin. Surface of body-whorl marked with 

 very numerous, low, distant, unequal, longitudinal ridges, divided by shallow 

 furrows, starting perpendicularly from the suture, then arching backwards, and 

 then becoming again perpendicular, until near the base they again sweep rapidly 

 backwards till they are merged in the fold of the inner lip ; irregularly covered 

 and partially obscured by more numerous finer ridges. Surface of upper whorls 

 similar, but truncated halfway down by the succeeding whorls. 



Size. — A specimen measures 70 mm. m height by 37 mm. in width. 



Locality. — Chudleigh. There are several fine specimens in Mr. Vicary's Collec- 

 tion, and one in the British Museum. 



Remarks. — This species is very similar to M. subcostata, which has frequently 

 been confounded with it. D' Archiac and de Verneuil have, however, distinguished 

 them, and a comparison of the English specimens with Schlotheim's figures of the 

 two species leads me to think that the French authors are right in their 

 conclusions. The Chudleigh fossils are generally shorter and stouter shells than 



