404 NJOCKXK M< )LUS(\\. 



Bonellitia serrata (Bronn). Plate XL, figs. 10, 11. 



1831. Cancellaria serrata, Bronn, Ital. Tert. Geb., p. 44, no. 211. 



1872. Cancellaria Bellardi ?, S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. I, p. 47, pi. Hi, fig. 25. 



1873. Cancellaria serrata, d'Ancona. Mem. Cart. Geol. Ital., vol. ii, p. 232, pi. xiii, fi^s. 13, 14. 

 1876. Cancellaria serrata, Seguenza, Boll. R. Com. Geol. Ital., vol. vii, p. 8, no. 452. 



1890-4. Cancellaria serrata, Sacco, Boll. Soc. Geol. Ital., vol. ix, p. 264, no. 3863, 1890; Bonellitia 



serrata, Moll. Terr. Terz. Piem., pt. xvi, p. 43, pi. iii, figs. 5 — 10, 1894. 

 1899. Aclmete {Bonellitia) serrata, Cossrnann, Ess. Pak'oconch. compar., vol. iii, p. 34 



Specific Characters. — Shell small, fragile, ovato-turriculate ; whorls 5 or 6, 

 ventricose and rounded, the last much the largest, about two-thirds the total 

 length ; ornamented by numerous obliquely curved longitudinal costee, distinct but 

 not prominent, clath rated by fine well-marked spiral ridges with still finer ones in 

 the interspaces ; spire rapidly diminishing in size upwards ; suture deep ; mouth 

 oval ; outer lip grooved within ; columella imperforate, with three folds. 



Dimensions. — L. 10 mm. B. 7 mm. 



Distribution. — Not known living. 



Fossil : Coralline Crag : Boyton. Walton ian : Little Oakley. 

 Newbournian : Sutton (? derivative). 



Miocene : France, Italy. 



Lower Pliocene : Castelnuovo, Ventimiglia, Bordighera, Albenga. 



Upper Pliocene : Livorno, Bologna, Orciano, Altavilla. 



Remarks. — The present species is said to occur abundantly at certain localities 

 of the argiles bleues (Lower Pliocene) of the Ligurian coast, and Seguenza gives it 

 from various exposures of the Upper Pliocene of Sicily and Italy. One of the 

 specimens now represented is from the Coralline Crag of Boyton and belongs to 

 the Sedgwick Museum at Cambridge ; the Italian fossil figured for comparison, 

 with which it closely corresponds, I owe to the kindness of Mr. Clarence Bicknell 

 of Bordighera. I have two others from Oakley, imperfect, which Prof. Sacco has 

 identified with them ; the one given by Wood as G. Bellardi, from the Red Crag of 

 Sutton, was regarded by the latter as derivative from some older deposit, which, 

 judging from its appearance, may probably be the case. That from Boyton, 

 however (fig. 10), is clearly a genuine Crag shell. 



Prof. Sacco remarks that B. serrata., though varying in the number and size of 

 its longitudinal and transverse costee, retains a character of its own which is 

 sufficiently constant. It seems specially distinguished by its delicate sculpture and 

 its ventricose whorls. 



