BONELLITTA EVULSA. 403 



1890-4. Cancellaria Bellardii, Sacco, Boll. Soc. Geol. Ital., vol. ix, p. 263, no. 3840, 1800; Bonellitia 



evulsa and vars., Moll. Terr. Terz. Pieni., pt. xvi, p. 45, pi. iii, figs. 12 — 20, 1894. 

 1899. Admete (Bonellitia) evulsa, Cossmann, Ess. Paleoconch. compar., vol. iii, ]>. 33, pi. ii, figs. 6, 7. 

 1907. Cancellaria evulsa, Ravn, Kongl. Dansk. Vid.-Selsk. Skrift. [7], vol. iii, p. 339, pi. vi, fig. 16. 

 1913. Cancellaria evulsa, Harder, Damn. geol. Unders^gelse [2], no. 22, pp. 85, 130, pi. vii, figs. 4, 5. 



Specific Characters. — Shell of moderate size, ovato-oblong ; whorls 6, convex, 

 the last ventricose, much the largest, three-fourths the total length, excavated 

 below ; ornamented by numerous oblique longitudinal costae, with an occasional 

 varix, and by fine spiral lines which cross the ribs ; suture deep ; spire rapidly 

 and regularly diminishing in size upwards ; mouth irregularly ovate, angulated 

 above and below ; outer lip thickened and grooved within ; columella with three 

 folds. 



Dimensions. — (Of Crag specimens) L. 12 — 15 mm. B. 7 — 10 mm. 

 Distribution. — Not known living. 



Fossil : Waltonian Crag : Little Oakley. 

 Eocene : Hampshire basin, France, Denmark, Belgium. 



Oligocene : Germany (Upper, Middle, and Lower). Denmark (Upper and 

 Middle), Belgium. 



Miocene : Denmark, Belgium, Vienna basin, Italy. 



Remarks. — The generic name Bonellitia is used for a group of the Cancellariida3 

 allied to Admete but differing from the latter in certain particulars which are 

 given, with a full statement of its distinguishing characteristics, by M. Cossmann 

 in the work already alluded to. 



The present species, originally described from an Eocene fossil of the Hamp- 

 shire basin, has been recorded from various horizons of the Oligocene and Miocene 

 deposits of different parts of Europe, in which it is widely distributed. Specimens 

 from the Eocene are not identical with those of a later period, but they are all 

 grouped by palaeontologists as varieties of the same species. B. evulsa continued 

 to exist in the North Sea basin up to and during Miocene times, but it has not 

 been recorded hitherto from the Crag. Its variable character is shown by the fact 

 that Prof. Sacco has described 9 distinct varieties of it, mostly from the 

 neighbourhood of Turin. 



I figure a specimen from the Belgian Miocene received from M. Dautzenberg 

 which he considers to represent one of Prof. Sacco's varieties of this species. 1 I 

 have found several examples at Oakley, more or less imperfect and smaller, 

 apparently belonging to the same group. 



M. Cossmann while separating this and some allied forms from Cancellaria, 

 regards Bonellitia, as a sub-genus of Admete. 



1 Our Crag shells agree with the Miocene rather than with the Eocene form. 



