Nigerian Eocene Mollusca. 39 



extremity, crossing which are extremely fine and close longitudinal striations 

 which, however, are stronger and more prominent within the spiral grooves 

 of the basal region of the shell. 



DIMENSIONS. 



Alt. ... ... ... ... ... 18 millimetres. 



Lat ... ii 



REMARKS. This shell is of apparently rare occurrence, only two examples 

 having been collected. It is, however, of considerable interest because it 

 belongs to Stimpson's genus Liomesus 1 ( = Buccinofisis, Jeffrey 1867, non 

 Conrad 1857) of which the type is Buccinum dalei of J. de C. Sowerby 

 found in the Pliocene formation and which also exists in British and Northern 

 Seas. Without the aid of magnification the central region appears to be 

 quite smooth, the spiral striae being almost obsolete. The specimens show 

 the characteristic plication at the base of the columella and parallel with it 

 above is the strong carination which follows the twist of the basal region, 

 the area between being marked with the spiral ornamentation. The species 

 is chiefly distinguished from Buccinum dalei by its more cylindrical form, in 

 having a more coniform and depressed spire, and in the possession of the 

 prominent spiral striations immediately anterior to the suture. The shell 

 besides possesses a narrower aperture and is much more contracted at the 

 base. According to M. Cossmann, 2 who has published probably the latest 

 account of this genus, Liomesus is confined to Pliocene and Recent seas, so 



o ' ' 



that its occurrence in Eocene rocks is a feature of interest in connection 

 with its geological distribution. 



OCCURRENCE. Cutting, No. 6. 

 COLLECTOR. Mr. Kitson. 



Cominella douvillei, sp. nov. 

 PLATE 2, figs. 18, 19. 



DESCRIPTION. Shell turriculate, ovately -fusiform, spire short, about half the 

 length of the body-whorl, anterior extremity forming a small broad canal ; 

 volutions 5 or 6, deeply sutured, sloping and angulate posteriorly, sides 



1 Canadian Naturalist, 1865, N. Ser., Vol. 2, p. 366. 



2 Essais de Paleoconchologie Comparee, 1901, part 4, pp. 145, 146, pi. 5, figs. 12, 13. 



