DRILLIA INCRASSATA. 223 



Remarks. — Mr. A. Bell informs me be met with this species many years ago in 

 the Red Crag of Sutton, the specimen being quoted in Prestwich's list on the 

 authority of Gwyn Jeffreys under the name of Cono2:)leura Maravignse {op. cit.). 

 The latter authority gives it also from the Coralline Crag of Gedgrave. It is not ^ery 

 rare at Oakley, from which place I have obtained several well-marked varieties. 

 Most of my specimens are worn, and might be regarded as derivative were it not 

 that one variety (var. Nysti) occurs in the Scaldisien of Belgium, where there is no 

 suggestion of derivation. 



One or two of my Oakley fossils correspond more or less nearly with the 

 multicostate form figured by Bellardi, but as they are worn I give a ■ perfect 

 specimen of this variety from the Italian Pliocene. Drlllia incrassata has a wide 

 range in time and space. It occurs in the Miocene, both of France and Grermany, 

 as well as at all stages of the Pliocene and Pleistocene of Italy and Sicily. It is 

 reported under the name of Conopleura Maravignse as living in all parts of the 

 Mediterranean, and on the coasts of Spain and Portugal. 



Var. dertomagna, Sacco. Plate XXVII, fig. 29. 



1847. Raphitoma incrassata, Bellardi, Mem. E. Accad. Sci. Torino [2], vol. ix, p. 636, pi. iv, fig. 27. 

 1877. Drillia incrassata, var. D, Bellardi, Moll. Terr. Terz. Piem., pt. ii, p. 142, pi. v, fig. 2. 

 1890. Drillia incrassata, var. dertomagna, Sacco, Boll. Soc. Geol. Ital., vol. ix, j). 273, no. 4088. 

 1904. Drillia {Cymatosyrinx) incrassata, var. dertomagna, Sacco, Moll. TeiT. Teiz. Piem., pt. xxx, 

 p. 47. 



Dimensions. — L. 10 mm. B. 5 mm. 



Distribution. — Not known living. 



Fossil : Waltonian Crag : Little Oakley. Xewbournian : Wald- 

 ringfield. 



Miocene (Tortoniano) : Italy. 



BemarliS. — I have a dozen fossils from Oakley which evidently belong to the 

 incrassata group, but differ from the type in that they are stronger, not so slender 

 in form, with fewer longitudinal costge. In M. Dollfus' opinion they may be 

 referred to Prof. Sacco's variety dertomagna. 



Var. miominor (?), Sacco. Plate XXVII, fig. 30. 



1877. Drillia incrassata, var. C, Bellardi, Moll. Terr. Terz. Piem., pt. ii, p. 142. 



1890. Drillia incrassata, var. miominor, Sacco, Boll. Soc. Geol. Ital., vol. ix, p. 273, no. 4087. 



1904. Drillia (Cymatosyrinx) incrassata, var. miominor, Sacco, Moll. Terr. Terz. Piem., pt. xxx, p. 47, 



pi. xii, fig. 48. 

 1914. Drillia {Cymatosyrinx) incrassata, var. miominor, Cipolla, Palaeout. Ital., vol. xx, p. 123, pi. xii, 



fig. 12. 



