50 MOLLUSCA FROM THE CRAG. 



Shell turreted and fusiform, with an elevated conical spire ; volutions seven, convex, 

 tumid, covered with four or five elevated and tuberculated transverse ridges ; longi- 

 tudinally decussated, aperture ovate ; canal moderate in size, and open. 



Axis, If inch. 



Locality. Cor. Crag. Ramsholt and Gedgrave. 

 Red Crag. Sutton and Newbourne. 



This shell has been separated from the preceding species for the following reasons : 

 the volutions are more tumid, and it has three transverse ridges upon the whorls of 

 the spire, while in Tr. alveolatum there are but two, and the canal in the latter is 

 more recurved. Numerous specimens of this and of the preceding species have been 

 obtained within the last few years from Gedgrave, all of which appear to preserve the 

 distinctions I have described without any intermediate or connecting forms. 



9. TROPHON IMPERSPICUUM. S. Wood. Tab. VI, fig. 12. 



Tr. Testa elongato-fmiformi, angustd, turritd; spird elevatd ; an fractions octo, converts ; 

 suturisprofundis, longitudinaliter costulatis, striis transversis decussatis ; ultimo anfractu 

 obsolete costato ; aperturd ovatd ; canali elongatd, subrectd. 



Shell elongate, fusiform, turreted, and subulate, with an elevated spire, and acumi- 

 nated apex ; volutions eight, longitudinally costellated ; costae small and numerous, 

 obsolete upon the body whorl, coarsely striated transversely ; aperture ovate, with an 

 elongate, open, and nearly straight canal. 



Axis, 1 j inch. 



Locality. Cor. Crag, Sudbourn. 



I have as yet obtained but one specimen of this elegant shell, which somewhat 

 resembles Fusus DesJtayesii, Nyst (Coq. foss. de Belg. p. 502, pi. 40, fig. 3) ; but it 

 appears to differ specifically in being more elongate, and in having a greater number 

 of costse. The outer lip is a little broken, but in other respects the specimen is in 

 very good condition. The species must, however, be considered doubtful, and the 

 present name only as provisional, until more and better specimens be obtained. 



10. TROPHON MURICATUM. Mont. Tab. VI, fig. 5. 



MUBEX MURICATUS. Mont. Test. Brit. p. 262, pi. 9, fig. 2, 1803. 

 Fusus ECHINATUS. J. Sow. Min. Conch, t. 199, fig. 4, 1820. 



Phil. En. Moll. Sic. vol. i, p. 206, t. 11, fig. 10, 1836. 

 Fusus MURICATUS. Thorpe. Brit. Mar. Conch, p. 206, fig. 97, 1844. 



Tr. Testa turritd, muricatd, fusiformi; artfractibus sex, convexis ; longitudinaliter 

 costellatis, transversim striatis, decussatis, subimbricatis ; aperturd ovatd, labro intus 

 denticulato ; canali brevi recurvd. 



Shell fusiform, turreted, and echinated ; whorls six, convex, with deep suture, 

 longitudinally costated, and coarsely striated transversely; aperture ovate, with a 

 short and recurved canal ; outer lip dentated within. 



