92 PLIOCENE MOLLUSCA. 



forming varices on the body-whorl ; mouth wide, ovate, angulate above, about half 

 the total length or rather less ; outer lip thin, expanded ; canal short, wide, open. 



Dimensions. — L. 55 mm. B. 32 mm. 



Distrihution. — Recent: Finmark, Faroes. 



Fossil : Waltonian Crag. Newbournian ; Butleyan ; Icenian. 



Pleistocene : Middle Glacial sands of Billockby, Hopton ; March gravels. 

 Norway. 



Bemarhs. — When examining the Buccinums in my collection Dr. 0yen recog- 

 nised a number of them as identical with the Scandinavian y ariet j cserulea of Prof. 

 Gr. 0. Sars, and he has since been kind enough to send me some specimens from 

 the Pleistocene deposits of Christiania for comparison, one of which I have figured. 

 To some extent they correspond with the variety Iseviuscula of Wood, but they 

 are not the same and the name caevidea is so generally used by northern writers 

 that it seems undesirable to alter it. Many years ago I found this form very abun- 

 dantly in the March gravels, the specimens agreeing with that figured by Prof. Sars. 



Were it not that I am unwilling to disturb the existing nomenclature I should 

 be disposed to group these shells and those next to be described as specifically 

 distinct, as originally proposed by Sowerby. They seem but distantly connected 

 with the coarsely sculptured molluscs known to British concliologists as B. 

 ■undatum} 



Var. tenera, J. Sowerby. Plate VI, fig. 8. 



1825. Buccinum tenerum, J. Sowerby, Miu. Conch., vol. v, p. 140, tab. cccclxxxvi, fig. 3. 



1843. Buccinum tenerum, Nyst, Coq. foss. Terr. Tert. Belg., p. 571, pi. xliii, fig. 9. 



1848-74. Buccinum undatum, var. tenerum, S. V. Wood, Mon. Crag Moll., pt. i, tab. iii, fig. 12 d, 



1848 ; 1st Suppl., p. 18, 1874. 

 1870. Buccinum undatum, var. tenerum, S. V. Wood, juu., and F. W. Harmer, Rep. Brit. Assoc. 



(Liverpool), p. 90. 



Dimensions. — L. 40 mm. B. 25 mm. 



Remarks. — Among the Crag specimens of Buccinum just referred to which Dr. 

 0yen assigned to the variety cmrulea, there is a form differing from the one last 

 described in having a much shorter spire and finer transverse sculpture. This 

 appears identical with the one described by Sowerby in 1825 as B. tenerum, 

 corresponding also with that given by Wood in 1848, as will be seen by comparing 

 his figure with the specimen from Butley here represented. 



As Sowerby's name has the precedence I retain it for this shell, while the 

 term cseridea of Prof. G. 0. Sars may be adopted for the more elongate form. 



As far as I know, neither of the varieties tenera or cseridea, now live in 



' In his 1st Supplement (p. 18) Wood expressed a similar opinion as to the variety tenera, which 

 Nyst also regarded in 1843 as a distinct species. 



