224 PLIOCENE MOLLUSCA. 



Diineiisloiis.—h. 14 luiii. B. G mm. 



Distribution. — Not known living. 



Fossil : Coralline Crag : Gromer Pit. 



Miocene : Italy — Colli torinesi. Upper Pliocene : Altavilla. 



BemarliS. — The shell figured under this name is from the Gomer pit at 

 Gedgrave, now unfortunately closed, from which so many interesting specimens 

 were formerly obtained. 



Although worn, with the costre nearly obliterated, it seems to correspond more 

 or less nearly with one of Prof. Sacco's figures (7. v.) of his var. miominor. It is, 

 however, larger than the Italian fossil, to which I provisionally refer it. Dr. 

 Cipolla reports this variety from the Upper Pliocene of Altavilla. 



Var. crassa (A. Bell). Plate XXVII, fig. 32. 



1871. Conopleura crassa, A. Bell, Ann. Mag. Nat. Hist. [4], vol. vii, p. 358. 



1872. Plenrotoma crassa, S. V. Wood, Mon. Crag Moll.. 1st SuppL, lA. i, p. 37, pi. vii, fig. 10. 

 1890. Drillia crassa, E. Vincent, Bull. Soc. Eov. Malac. Belg., vol. xxv, p. 98 (fig.)- 



1892. Drillia crassa, Van den Broeck, Bull. Soc. Beige Gc'ol., vol. vi (Mt'moires), p. 122. 

 1912. Drillia crassa, Tescli, Med. v. d. Rijks. v. Delfstoffen, pt. iv, p. 92, no. 237. 



Varietal Characters. — Shell rather thick, subfusiform; spire conical; longi- 

 tudinal ribs fewer in number than in the type, and confined to the upper whorls ; 

 spire more elongate than in var. dcrtomagna. 



Dimensions. — L. 16 mm. B. 6 mm. 



Distrihntion. — Not known living. 



Fossil: Coralline Crag: Gedgrave. Waltonian : Walton-on-Naze, 

 Little Oakley. Newbournian : Newbourn. Butleyan : Butley. 



Scaldisien : Antwerp, Dutch borings. 



liemarks. — I have shown my Oakley specimens of the shell figured under this 

 name to ]\Ir. Bell, who has identified them with that described by him in 1871. 

 It has been regarded by himself and others as specifically distinct from V. 

 incrassata. Comparing it with the type of that species, there seems some reason 

 for this view, but if we admit the other allied forms such as var. dertomagn.a to be 

 varieties, it will be difficult to keep the present one distinct. They belong to one 

 group, and, on the whole, I prefer to associate them under the same name. 



Var. Nysti, nov. Plate XXVII, fig. 31. 



1881. Plenrotoma incrassata, Njst, Conch. Terr. Tert. Belg., p. 45, pi. iii, fig. 10. 



Dimensions. — L. 14 mm. B. 5 mm. 

 Distribution. — Not known living. 



Fossil : Waltonian Crag : Little Oakley. Butleyan : Butley, 

 Scaldisien : Antwerp. 



