BBLA NORDGAARDI. 299 



Bela Nordgaardi, sp. nov. Plate XXXII, fig. 21. 



1872. Pleurotoma hicarinata, S. V. Wood, Mon. Crag Moll., 1st SuppL, pt. i, p. 43, pi. vi, fig. 17. 



Specific Characters. — Shell tliin and fragile, ovato-fusiform ; whorls 6, but 

 slightly convex, not carinatecl, the last much the largest, three-fourths the total 

 length, excavated below ; spire short, regularly and rapidly diminishing in size ; 

 suture distinct but not deep ; ornamented by numerous longitudinal ribs, nearly 

 obsolete, closely crowded together, dying out on the body-whorl, and by very fine, 

 delicate and inconspicuous spiral lines ; mouth long, acutely angulate above, 

 ending in a short, well-marked canal which turns slightly to the left; outer lip 

 expanded, gently curved ; inner lip forming a rather wide glaze ; columella flexuous. 



Dimensions. — L. 12 mm. B. 5 mm. 



Distribution. — Not known living. 



Fossil : Butleyan Crag : Butley. 



B,emarlcs. — The Butley fossil here figured is from the British Museum, 

 where it has been labelled " Fleiirofoma carimttd?, purchased from Mr. R. Bell, 

 1888." It seems to be the same as the Butley shell described by Wood with some 

 doubt as P. hicarinata. It is not the Italian P. caiinatimi, Philippi, however, 

 = Fusus modiolus, Jan, nor do I think it is the B. hicarinata of Couthouy and of 

 Scandinavian conchologists,^ which is smaller, having two strong and prominent 

 spiral costge on each whorl, the upper one forming a distinct keel with a sloping 

 shelf below the suture, having also an angulation of the mouth and the outer lip. 

 In our fossil the whorls are simply convex, rounded and ecarinate ; the spiral 

 sculpture is not strong and bicarinate, but delicately multistriate. 



Mr. A. Bell reported the true P. hicarinata from Butley in 1871 (Ann. Mag. 

 Nat. Hist. [4], vol. vii, p. 356). A.s he does not know what has become of the 

 specimen, I figure below a Recent shell for the guidance of future collectors. 



I dedicate the present shell to Prof. Nordgaard, of Trondhjem, from whom 

 I have received some friendly help in the identification of the northern species of 

 Crag Mollusca. To some extent it resembles the figures of B. simplex given by 

 Prof. G. O. Sars, but I do not think it can be referred either to that species or 

 to the B. schantarica of Middendorff. It appears to be a special Crag form, to be 

 distinguished by its excessively delicate sculpture and its non-carinated whorls. 



Var. ventricosa, nov. Plate XXXII, figs. 22, 23. 



Varietal Characters. — Differs from the last variety in its wide mouth, shorter 

 spire and more tumid body- whorl. 



^ Jeffreys, moreover, expressed the opinion (Ann. Mag. Nat. Hist. [4], vol. xix, p. 328) that the 

 Crag shell is not the Pleurotoma hicarinata of Couthouy. 



