﻿MACR0CH1LINA. 165 



Whorls rather narrow, adpressed round the suture, moderately convex, but 

 flattened about their centre. Body-whorl nearly two-thirds the height of the shell, 

 voluminous, being much larger, more swollen and convex than the rest of the 

 spire, gently arching below round the base of the shell. Columella long, rounded, 

 straight, tapering, apparently somewhat twisted. No umbilicus. Mouth large, 

 pointed above, extended below. Inner lip diffuse. Shell-structure thick. Surface 

 marked with irregular growth-lines. 



Size. — Height 45 mm., width 26 mm. 



Localities. — There are three specimens from Wolborough in Mr. Vicary's 

 Collection, and four others from the same locality, chiefly very poor, in the Museum 

 of Practical Geology. In the Torquay Museum are two other much smaller 

 specimens from Barton or Lummaton, and another from Wolborough ; and a still 

 smaller specimen from Chudleigh is in Mr. Vicary's Collection. Three specimens 

 in the Woodwardian Museum from Plymouth, which have been described by M'Coy, 

 belong, I believe, to the same species. 



Remarks. — This species appears to be distinguished from the others that ac- 

 company it by its shortish ovoid form, its small, rapidly increasing spire of few 

 convex whorls, its large, long body-whorl, long columella, and large mouth. Mr. 

 Vicary's largest Wolborough example is very fine, but, having suffered from an 

 almost obliterated fracture, its shape is rather misleading, while its surface is not 

 sufficiently preserved to show whether it was smooth. It may be noticed that to 

 its apex a small specimen of Davidsonia Verneuillii, Bouchard, is attached, though 

 this is not shown in the figure. Of the shells figured by Phillips it most resem- 

 bles Macrocheilus imbricatus, Phill., PI. XXXIX, fig. 194 b, not Sow., but it is 

 much more elongate and has a more conical spire and larger body-whorl than that 

 fossil. Mr. Roberts was inclined to identify it with Macrochilina subcostata, 

 Schlotheim, when we examined it together, chiefly on account of the flattening 

 about the sutures ; but I am not convinced of the correctness of this view, as it is 

 a distinctly shorter shell with more convex whorls ; and if it agrees, as I believe it 

 does, with the other specimens with which I have classed it, it certainly cannot 

 belong to Schlotheim's species. 



The specimen in the Torquay Museum is the one which agrees best with those 

 M'Coy described. That from Chudleigh is a very small shell, and in it the body- 

 whorl is proportionately smaller and the sutures shallower. The former difference 

 is, however, probably due to its youth, and the latter may be accounted for by its 

 having preserved the outer layer of the test, which is more or less wanting in the 

 other specimens. I am inclined to think that the above examples all belong to 

 the same species, and that they are distinct from the other shells of the same 

 genus that accompany them. 



Sowerby, in the ' Min. Conch.,' figures under the name of Buccinum imbricatum 



