6 SECOND SUPPLEMENT TO THE CRAG MOLLUSCA. 



is an accompaniment of the full-grown shell in most species rather than of the young, and 

 I have had the specimen figured lest by any chance it should have been regarded as some 

 new species and added to the number of such in lists of crag shells for which I can find 

 no warrant. 



Captain Brown has figured a specimen of this species with a dentated outer lip 

 (' Illustr. Conch. Grt. Britain,' PL xlix, fig. 6), which he has called Purpura Anglicance, 

 referring to 'Lister's Conch.,' PL 965, fig. 18. "Lister does not say from whence he 

 obtained this singular variety '' (Brown). 



TROPHON (SiPHo) ISLANDICUS, Chemnitz. 2nd Sup., Tab. II, figs. 3 0, 3 b recent. 



Fusus ISLANDICUS, Forb. and Hani. Brit. Moll., vol. iii, p. 416, pi. ciii, fig. 3, 1853. 



Locality. Red Crag, Sutton. 



The shell figured as above represents a specimen which I found many years ago and 

 regarded as a var. of Trophon gracilis, figured and described in Crag Moll., vol. i, p. 46, 

 tab. vi; but which I here give as a true representation of the recent British shell 

 called Islandicus (fig. 3 a) ; and by the side of it have had engraved the figure of a recent 

 specimen of that species for comparison, (fig. 3 b] because it has been said not to be a crag 

 species. This shell is rather more elongated than gracilis, and deserves the name of 

 angustius, originally given to it long before the time of Linne or of Gmelin, and which I 

 adopted in my original catalogue published in the Annals of Nat. Hist, in 1842, p. 541. 

 That name, however, being anterior to the time of our starting point, the 12th edit, of 

 Linne, I give the shell under the usually received name of Islandicus. 



TROPHON (SiPHo) TORTUOSUS, L. Reeve. 2nd Sup., Tab. II, fig. 2 a, b. 



TROPHON GRACILE, var. S. Wood. Crag Moll., vol. i, p. 46, tab. vi, fig. 105, 1848. 



Dr. Reed has lately sent me several specimens both from the Coralline and Red Crags 

 that belong to a group of 'shells of which Fusus Islandicus may be considered as the type. 

 Among those from the Red is one (fig. 20) supplied by Mr. A. Bell and marked by the 

 latter as Fusus tortuosus of L. Reeve, figured and described in Sir Edward Belcher's ' Last 

 of the Arctic Voyages,' vol. ii, p. 394, PL xxxii, fig. 5 a, b. 



The shell figured in the Crag Moll., tab. vi, fig. 10 b, is referred by Mr. A. Bell to 

 the same species, and I am now disposed to think that Mr. Bell's references of this shell 

 to Lovell Reeve's species is correct, if the differences be sufficient to constitute a specific 



