226 PLIOCENE MOLLUSCA. 



Var. pliomagna, Sacco. Plate XXVII, fig. 26. 



1877. Drillia sigvioidea, var. A, Bellardi, Moll. Terr. Terz. Piem., pt. ii, p. 145. 

 1890. Drillia sicjmoidea, var. pliomagna, Sacco, Boll. Soc. Greol. Ital., vol. ix, p. 273, no. 4092. 

 1904. Drillia (Cymatosyrinx) sigmoidea, var. pliomagna, Sacco, Moll. Terr. Terz. Piem., pt. xxx, 

 p. 47, pi. xii, figs. 49, 50. 



Varietal Characters. — Differs from the type in being larger, more robnst and 

 less slender and delicate, with stronger scnlpture ; the whorls are less convex, and 

 the suture not so deep. 



Dimensions. — L. 15 mm. B. 6 mm. 



Distribution. — Not known living. 



.Fossil : Waltonian Crag : Little Oakley. Newl30urnian : Wald- 

 ringfield. 



Lower Pliocene : Northern Italy. 



Remarks. — The shell figured under the present name was found at Waldring- 

 field and belongs to the Ipswich Museum. It seems to correspond with that 

 represented by Prof. Sacco from the Italian Pliocene under the present name, 

 which he identifies with the variety A of D. sigmoidea, described by Bellardi 

 in 1877, but not figured. It has the sigmoid ribs of the type form, but is a 

 stronger and larger form, with coarser sculpture and is distinct from the latter. 

 Bellardi speaks of it as being rare in the Italian Pliocene. 



Drillia crispata (Jan). Plate XXVII, figs. 22, 23. 



1832. Pleurotoma crispaia, Jan, Cat. rer. nat. Mus. Crist. Jan, p. 9, no. 25. 



1847. Pleurotoma crispata, Bellardi, Mem. E. Accad. Sci. Torino [2], vol. ix, p. 597, pi. iv, fig. 2. 



1853. Pleurotoma crispata, Homes, Foss. Moll. Tert. Wien, vol. i, p. 367, j:)! xxxix, fig. 13. 



1872. Pleurotoma crispata, von Koenen, Mioc. Nord. Deutscli., pt. i, p. 101, no. 114. 



1873. Pleurotoma crispata, Seguenza, Boll. E. Com. Geol. Italia, vol. iv, p. 296, no. 80. 

 1877. Drillia crispata, Bellardi, Moll. Terr. Terz. Piem., pt. ii, p. 131, pi. iv, fig. 21. 

 1890. Drillia crispata, Sacco, Boll. Soc. Geol. Ital., vol. ix, p. 272, no. 4069. 



Specific Cliaracters. — Shell rather small, slender, subfusiform; whorls 8 — 10, 

 excavated above, the last about half the total length ; ornamented by well-marked 

 spiral ridges, three on the upper whorls, and extending to the base. The upper 

 ridge is the most prominent, forming a distinct keel, which in the type is faintly 

 denticulate in the uppermost whorls, and in var. papulosa on the lower ones also ; 

 spire elongate ; apex acute ; suture margined by the lowest spiral ridge ; mouth 

 ovate, narrow, passing into a short and nearly straight canal. 



Dimensions. — L. 14 mm. B. 4 mm. 



Distribution. — Not known living. 



Fossil .• Waltonian Crag : Little Oakley. 



