NATICA TIGRINA. 679 



Pliocene : France — Rhone valley, Biot. Italy — Liguria, Piedmont, Tuscany. 

 Calabria- 

 Pleistocene : Sicily, Calabria, Tuscany. 



Remarks. — This species, which is widely diffused as a recent shell in the 

 Mediterranean region, is reported from the Miocene and Pliocene deposits of 

 different parts of Europe and by Seguenza from the Pleistocene of Tuscany, 

 Calabria and Sicily. It appears doubtful whether the typical N. millepunctata is 

 to be found as fossil in the Anglo-Belgian basin, being represented there by 

 N. multipunctata . 



Natica tigrina, Defrance. Plate LV, fig. 15. 



1826. Natica tigrina, Defrance, Diet, Sci. nat., vol. xxxiv, p. 257. 



1827 — 40. Natica tigrina, Grateloup, Bull. Soc. Linn. Bordeaux, vol. ii, p. 155, no. 142, 1827 ; Atlas, 



Conch. Terr. tert. Bass, de l'Adour, vol. i, pi. iv, fig. 12 ; pi. v, figs. 2, 3, 5, 1840. 

 1844. Natica tigrina, Philippi, Enum. Moll. Sic, vol. ii, p. 141, pi. xxiv, fig. 17. 

 1873—74. Natica tigrina (?), Seguenza, Boll. R. Com. Geol. Ital., vol. iv, p. 352, no. 253, 1873; 



vol. v, p. 280, no. 101, 1874. 

 1890 — 91. Natica millepunctata, var. tigrina, Sacco, Boll. Soc. Geol. Ital., vol. ix, p. 308, no. 4976, 1890; 



Moll. Terr. Terz. Piem., pt, viii, p. 49, pi. ii, fig. 11, 1891. 

 1891. Natica tigrina, Cossmann et Peyrot, Conch, neog. de l'Aquitaine, vol. iii, p. 394, pi. xi, fig. 1. 



Specific Characters.- — Shell ovate, slightly oblique, generally smaller than 

 N. multipunctata, with a conical and more prominent spire ; whorls 5, convex, the 

 last ventricose, rounded ; separated by deep but linear sutures ; umbilicus large 

 and deep with a funicular ridge ; mouth semilunar, not so much expanded as in 

 N. millepunctata, angulate above, rounded below ; outer lip incurved ; callus on 

 inner lip narrower than in the former species. 



Dimensions. — L. 32 mm. B. 25 mm. 



Distribution. — Not known living. 



Fossil : Red Crag, not rare but not worked out. 



Miocene : France. Pliocene : Italy, France. 



Remarks. — The Crag specimen here figured as N. tigrina seems to me to differ 

 essentially both from the Pliocene N. multipunctata of Wood and the recent 

 N. millepunctata of southern seas, as may be seen by comparing figs. 12 — 16 on my 

 Plate LV, but it agrees almost exactly with one described as a distinct species, 

 iV. tigrina, from the south of France, by MM. Cossmann and Peyrot in their recent 

 work on the ' Conchologie neogene de l'Aquitaine. ' The subject has not been 

 carefully worked out as to the distribution of this form in the various localities or 

 horizons of our Pliocene deposits, but it is not uncommon at Oakley, and may 

 probably be found elsewhere if looked for ; meanwhile I identify it provisionally 

 with Defrance's shell. 



