60 MOLLUS.CA FROM THE CRAG. 



7. Clavatula brachystoma. Phil. Tab. VII, fig 8, 8 a. 



Pleubotoma bbachystoma. Phil. En. Moll. Sic. p. 169, t. 26, fig. 10, 1844. 



CI. Testa turritd, subulatd, fusiformi ; anfractibus convexis, superne angulatis ; cos- 

 tatis, costis longitudinalibus, novem, ad suturam evanescentibus ; striis elevatis transversis, 

 aperturd ovatd, canali brevi ; labro acuto, extus incrassato. 



Shell turreted and tapering ; apex rather obtuse ; whorls convex, slightly angu- 

 lated at the upper part ; costated and striated ; costse 9, aperture ovate, with a 

 short canal : outer lip sharp, thickened externally. 



Axis, f of an inch. 



Locality. Cor. Crag, Sutton. Recent, Mediterranean. 



This species is by no means rare in the Coralline Crag. It agrees with a recent 

 specimen of brachystoma (obligingly lent me for comparison by Mr. Hanley, and 

 received by that gentleman from M. Philippi), except that the striae appear a little, 

 finer. The upper three volutions in the specimen from the Crag are cancellated, 

 and on the third volution there are at least a dozen ribs, whereas on those succeed- 

 ing it there are never more than eight or nine. The sinus in our shell is in the 

 angulated part of the volution, giving a slight depression at the upper part of the 

 whorl. 



8. Clavatula nebula. Mont. Tab. VII, fig. 10. 



Mubex nebula. Monl. Test. Brit. p. 267, t. 15, fig. 6, 1803. 



Pleubotoma Beeteandi. Phil. En. Moll. Sic. vol. i, p. 198, t. 11, fig. 20, 1836. 



Fusus (?) nebula. S. Wood. Catalogue 1842. 



Fusus nebula. Thorpe. Brit. Mar. Conch, p. 203, fig. 93, 1844. 



Pleubotoma Ginnannianum. Phil. En. Moll. Sic. vol. ii, p. 168, tab. 26, fig. 6, 1844. 



Mangilia nebula. Loven. Ind. Moll. Scand. p. 13, 1846. 



CI. Testa turritd, elongatd, subulatd ; anfractibus 7 — 8, convexis, longitudinaliter 

 costulatis, transversim striatis ; canali breviusculd recta ; labro haud incrassato. 



Shell elongate, tapering, with an acuminated spire ; volutions 7 — 8, convex ; 

 suture deep, spirally striated, and longitudinally costated ; costas 10 — 11; aperture 

 ovate ; outer lip sharp, with a small sinus a little below the suture ; canal very 

 short and open. 



Axis, J- of an inch. 



Locality. Red Crag, Sutton. Recent, Mediterranean and British Seas. 



I have as yet seen this species from one locality only, where it is not very rare. 

 It. appears to differ slightly from Philippi's figure and description. My specimens 

 are most of them much rubbed, though in some the stria? are distinctly visible ; 

 Philippi's figures have fewer ribs. The proportions of the aperture are variable, 

 though generally about one third the length of the shell. Loven considers the 

 M. nebula of British authors as identical with the Ginnannianum of Philippi, and I 

 have therefore, upon his authority, retained the name originally given in my 

 Catalogue, although the Crag specimens correspond better with the Mediterranean 

 shell, and are larger than any recent British specimens I have seen. 



