MANGILTA ASSIMTLIS. 381 



Mangilia assimilis, sp. nov. Plate XXXIX, fig. 20. 



Cf. 1905. Mangelia bertrandi, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iii, p. 333, pi. xciii, 

 fig. 6. 



Specific Characters. — Shell small, solid, turreted; whorls but slightly convex; 

 ornamented by a few strong and distinct ribs which extend to the suture but are 

 discontinuous, and to the base of the shell ; spire slender, elongate ; suture well 

 marked ; mouth narrow ; outer lip thickened by the labial rib ; labial notch 

 distinct ; canal very short. 



Dimensions.- — L. 10 mm. B. 3*5 mm. 



Distribution. — Not recorded living. 



Fossil : Waltonian Oag : Little Oakley. 



Remarks. — I have made many attempts to identify the fossil here figured but 

 without success. M. Dautzenberg, to whom I sent a photograph, suggested it 

 might be Mangilia Goodalliana, Leach, and was kind enough to send me some 

 specimens for comparison. When placed side by side with the Crag shell the 

 latter seems to be too unlike to be referred to it, even as a variety. The nearest 

 thing I can discover is one of the much enlarged figures of M. Bertrandi given 

 by Kobelt (op. cit., vol. iii, pi. xciii, fig. 6), but it is hardly the same; it differs 

 too widely, moreover, from the typical M. Bertrandi sent to me by Sign. Cerulli- 

 Irelli to be identified with that species. It seems a distinct form deserving notice. 

 I have therefore called it provisionally M. assimilis. 



Mangilia costato-striata (S. V. Wood MS., Kendall and R. Bell). Plate XXXIX, 



figs. 18, 19. 



1886. Pleurotoma costato-striata, Kendall and R. Bell, Quart. Journ. Geol. Soc , vol. xlii, p. 210. 

 1898. Pleurotoma costato-striata, A. Bell, Trans. Boy. Greol. Soc. Cornwall, vol. xii, p. 137. 



Specific Characters. — Shell very small, slender; whorls 6, slightly convex, the 

 first without sculpture, the others ornamented by 8 to 9 thin and rather prominent 

 longitudinal ribs, and by 8 inconspicuous spiral strias ; on the last whorl the ribs 

 are oblique and flexuous, hardly reaching the base of the shell ; spire elongate, 

 ending in a blunt point; mouth oblique, rather narrow, passing without break into 

 a short and open canal ; outer lip thickened by the labial rib, not expanded, with 

 a well-marked labial notch. 



Dimensions. — L. 7 — 8 mm. B. 3 mm. 



Distribution. — Not recorded living. 

 Fossil : St. Erth. 



Liemarlcs. — The fossils here represented are the type specimens referred to by 



