﻿190 DEVONIAN FAUNA. 



1840. Muhex harpula, Sowerly. Geol. Trans., ser. 2, vol. v, pt. 3, pi. lvii, 



fig. 21. 



1841. Macbocheilus harpula, Phillips. Pal. Foss., p. 105, pi. xxxix, fig. 197. 



1842. Natica subcostata, d'Archiac and de Verneuil. Geol. Trans., ser. 2, 



vol. vi, pt. 2, p. 366, pi. xxxiv, figs. 5, 6. 

 1844. — — Ooldfuss. Petref. Germ., vol. iii, p. 116, pi. cxcviii, 



figs. 22 a — c. 

 1849. Macbocheilus habpula, d'Orbigny. Prodrome, p. 63. 

 1849. Tubbo subcostatus, d'Orbigny. Ibid., p. 66. 

 1854. Macbocheilus harpula, Morris. Cat. Brit. Foss., p. 256. 

 1876. Natica subcostata, F. Homer. Lethaea Pal., pi. xxxii, fig. 8. 



1888. Macrocheilus habpula, Etheridge. Foss. Brit., vol. i, Pal., p. 163. 



1889. Littobina subcostata, Whidborne. Geol. Mag., dec. 3, vol. vi, p. 30. 

 1889. Tubbo subcostatus, Nicholson. Manual of Palaeontology, 2nd edition, 



vol. i, p. 775, fig. 668. 



DescrijJtion. — Shell small, globose, of few (two or three) very rapidly increasing 

 whorls. Sutures wide. Whorls starting convexly from the suture, somewhat 

 obliquely flattened on the back, so that the lower part of the whorl is widest, and 

 there curving evenly round the front of the shell to form the base ; ornamented 

 by coarse, round, transverse ribs, separated by interstices of a similar width, which 

 start from the suture and proceed obliquely backwards about one-third the breadth 

 of the whorl, when they divaricate and bend for a short distance still more backward, 

 so that the front part of the whorl has twice as small and numerous ribs as the upper 

 part. Mouth entire, large, oval, produced in the antero- exterior direction. No 

 umbilicus. Shell- structure very massive. Apex acute. 



Size. — A large specimen measures about 32 mm. in height. A more perfect 

 small specimen measures 9 mm. in height and 10 mm. in width. 



Locality. — Chudleigh, " Bradley, Plymouth." 1 There are three specimens from 

 the first locality in Mr. Vicary's Collection, one of which is as large as d'Archiac's 

 type, and another small but very perfect. 



Remarks. — There can be no question about the identity of these Chudleigh 

 fossils with the German species described by d'Archiac and de Verneuil, 

 Goldfuss, &c, as they correspond with it in every particular. Its name was 

 given originally in MS. by Goldfuss, and is quoted without description by von 

 Dechen in his German edition of De la Beche's ' Handbook.' 



There is more doubt whether the fossil described by Phillips under the name of 

 Macrocheilus harpula (Sow.) belongs to the present species. In general appearance 

 and markings it closely resembles it, but Phillips's description presents some diver- 

 gences ; e. g. according to it, the spire is more elongate, the base of the columella is 

 more thickened, and there is a plain longitudinal band running along the centre 



1 1841, Phillips, ' Pal. Foss.,' p. 105. 



