

PROSOBRANCHI ATA. 1 5 5 



the posterior margin, become gradually elevated and sharp, until at length the tubercles 

 between the last three or four furrows assume almost the character of the spines which 

 crown the whorls. The transverse furrows are numerous, and the last, which separates 

 the two rows of spines, is much wider than the others. The aperture is moderately wide ; 

 the outer lip thin and crenulated on the margin by the furrows, but smooth within ; 

 the inner lip spread widely over the body whorl, extending backwards a little beyond 

 the aperture ; the columella presents four not very oblique folds, of which the anterior 

 one is the largest and most prominent, and the posterior two are feeble. 



In the French specimens of this beautiful Volute the ribs are more numerous and 

 stronger, and the tubercles at the points of decussation are consequently more nodiform, 

 and are less elevated than in the English shells. A similar variance characterises the 

 French V. digitalina, as I have before observed, and as our specimens of the present 

 species agree very well in other respects with the French shells, I can only regard them 

 as a local variety. 



It is this species which the recent V. abgssicola most nearly resembles ; but although 

 that interesting shell presents a striking analogy with it, the much closer, more sharply 

 defined, and more delicate character of the cancellation which ornaments the surface, 

 the shorter spire, the more oblique and more slender columellar folds, and the less 

 expanded inner lip sufficiently distinguish it. 



Brogniart, in his list of fossil shells from the tertiary formations of the Vicentin, 

 mentions the present species, but remarks that it approaches more nearly to the Barton 

 form than to that from the Paris Basin ; an observation which is repeated by Defrance. 

 As V. digitalina is the Barton Volute which presents the nearest affinity to V, 

 crenulata, it is to that species I presume that these authors refer ; it is doubtful, 

 therefore, whether the Vicentin shells ought not to be referred to V. digitalina rather 

 than to the present species, and as I have not had an opportunity of examining any 

 specimens, I have cited the Italian Volutes, but with doubt. The shell represented by 

 fig. 22 (t. 25) in Mr. Dixon's work, and referred by Mr. Sowerby to this species, 

 appears to me, as I have already observed, to belong to V. digitalina. 



Size. — 



Localities. — Bracklesham Bay. French: Parnes, Grignon, (fide Desh.). Italian: 

 Ronca, Val Salgonini, (fide Bronn et Brogn.) ? 



No. 93. Voluta Solandri. F. E. Edwards. Tab. XX, figs. 6. a—d. 



Strombus luctator, Soland. 1/66. Brand. Foss. Hant., p. 30; t. 5, fig. 65. 

 Voluta spinosa, Webster. 1814. Geol. Trans., 1st ser., vol. ii, p. 204. 

 Sow. 1816. Min. Con., vol. ii, p. 30, t. 115, fig. 2—4. 

 — — Morris. 1843. Cat. Brit. Foss., p. 168. 



V. testa ovatc-oblongd, longitudinaliter costatd, transversim sulcata ,• spird mediocri, 



