112 PLIOCENE MOLLUSCA. 



liemarks. — The Crag fossil from Walton here figured belongs to the Jermyn 

 Street Museum. It corresponds closely with some Recent and undescribed New- 

 foundland shells I have received from the Tromsci Museum through Dr. Sparre 

 Schneider as B. ine.ridionale, which he informs me is a MS. name of Verkriizen; they 

 seem distinct from the last species, being especially characterised by their convex 

 whorls, their exceedingly fine and delicate spiral sculpture, and in the type form 

 by the absence of longitudinal plications, although the latter feature is not 

 constant in some of its varieties. 



Var. inflata, no v. Plate IX, figs. 3, 4. 



1881. Buccinum undatum, Nyst, Couch. Terr. Tert. Belg., p. 19, pi. ii, fig. 3. 



Dimensions. — L. 30 — 40 mm, B. 21 — 26 mm. 



Disirihution. — Recent : Newfoundland. 



Fossil: Waltonian Crag : Walton-on-Naze. Butleyan : Butley. 



Scaldisien : Belgium. 



Remarks. — The shells figured under this name, although differing somewhat 

 from the type form of B. vieridionale, have its exceedingly fine spiral sculpture 

 and seem to belong to the same group ; the spire is shorter in proportion to the 

 mouth than in B. inexhaustum, the whorls are more tumid, and the suture deeper ; 

 the longitudinal ribs, moreover, are comparatively few and prominent, reaching 

 the upper part only of the last whorl. There is a Recent specimen in the Norman 

 collection at South Kensington agreeing very nearly with the Walton shell which 

 I have also figured; Nyst's figure of B. undatum, from the Scaldisien of Belgium 

 {op. c/f.), appears to be the same. 



Var. elongato-undosa (Sparre Schneider, MS.), no v. Plate IX, figs. 5, 6. 



Dimensions. — L. 35 mm. B. 22 mm. 



Distribution. — Recent : Newfoundland. 



Fossil : Butleyan Crag : Butley. 



Remarks. — In the specimen from Butley figured under Dr. Sparre Schneider's 

 unpublished name of elongato-undosa, the spire is longer than in that of the variety 

 just described, and the flexuous plications on the upper whorls and on the upper 

 part of the last are somewhat more numerous. It corresponds more or less nearly, 

 however, with a Recent specimen he has kindly sent me, the variations of this 

 species in Pliocene times Ijeing apparently of a similar character to those of the 

 Recent shell. 



