﻿CAPULUS. 221 



the shell, consisting of less than a volution, probably free. Apex minute, very 

 distant from the plane of the mouth. Body-whorl large, regularly increasing ; in 

 section subcircular, but much complicated by nine or ten large, deep, subangular, 

 irregular, spiral grooves and ridges, which vanish only on the upper part of the 

 spire ; in longitudinal direction hardly curved, and regularly increasing, but slightly 

 more expanded at the mouth. 



Size. — Width 35 mm., depth 30 mm., height about 32 mm. 



Localities. — There is a very fine example in Mr. Vicary's Collection and a very 

 poor one in the Museum of Practical Geology from Wolborough ; as well as 

 another imperfect specimen in my Collection from Lummaton. 



Remarks. — The deep angulated furrows, the long straight body-whorl, and the 

 minute apex immediately distinguish this species. In Mr. Vicary's specimen upon 

 the inner or sutural side there first comes a fold following the line from the apex to 

 the mouth ; this is followed by a wide deep groove, then on the shoulder come two 

 high subangular folds separated by an equally narrow furrow, and followed by two 

 wide deep furrows, separated by a small low fold ; next on the back come two high 

 flattened folds separated by a small furrow ; then a very broad low fold bounded 

 on each side by a rather deep narrow furrow, and then on the lower part of the 

 whorl two high narrow folds separated by a rather small furrow : the rest of the 

 surface is hidden by the matrix. It is exactly like a specimen of Gapulus multi- 

 plicatus, Giebel, 1 as figured by Kayser, 2 and with this the English fossils must 

 clearly be identified. 



Affinities. — Under the name of Gapulus canalifer, Miinster 3 describes a very 

 large species with very similar markings. This appears to differ from ours in size 

 and in having a much less quickly tapering and straighter tube, so that the mouth 

 is smaller and much more distant from the apex. The spiral grooves also seem 

 much deeper and much shorter. In spite, therefore, of the great variability in 

 species of this genus, I do not think that these two forms could with any degree 

 of probability be referred to the same species. 



Gapulus haliotis, Sowerby, 4 of the Wenlock Limestone, with which F. A. Romer 

 identified it, has a very much larger and more spiral apex. 



Gapulus conicus, Trenkner, 5 is a more conical shell, and the apex is not at all 

 recurved. 



1 1858, Giebel, ' Sil. Foss. Unterharz.,' p. 22, pi. iii, fig. 6. 



2 1878, Kayser, ' Abbandl. Geol. Specialk. Preuss.,' Band ii, pt. 4, p. 97, pi. xvi, fig. 7. 

 8 1840, Miinster, 'Beitr.,' pt. 3, p. 82, pi. xiv, fig. 27. 



4 1839, Sow. in ' Murch. Sil. Syst.,' p. 625, pi. xii, fig. 1G. 



5 1868, Trenkner, ' Palaont. Novit.,' pt. 2, p. 21, pi. vii, fig. 14. 



