240 PLIOCENE MOLLUSCA. 



Remarls. — This species, the name of which has been often changed, is, like 

 other Crag forms of GlatJiurella, a characteristic Mediterranean species, its origin 

 going back to Miocene times. The specimen here figured is one I received from 

 Mr. P. G. H. Boswell, who obtained it at Bentley. It seems to be a dwarf form, 

 smaller and more slender than the type ; although worn it appears to correspond 

 with some Recent shells from Palermo which I received from the Marchese di 

 Monterosato. The specimen figured by Wood as Glavatula cancellata may be a 

 larger variety of the same species. 



Clathurella hystrix (Jan). Plate XXVIII, figs. 24, 25. 



1832. PJeiirotoma hystrix, Jan, Cat. rer. nut. Mus. Crist. Jan, p. 10, no. 59. 



1847. Raphitoma hystrix, Bellardi, Mem. E. Accad. Sci. Torino [2], vol. ix, p. 613, pi. iv, fig. 14. 



1870. Defrancia hystrix, A. Bell, Ann. Mag. Nat. Hist. [4], vol. vi, p. 215. 



1871. Defrancia hystrix, Jeffreys in Prestvvich, Quart. Jouru. G-eol. Soc, vol. x.wii, pp. 143, 488. 



1872. Pleurotoma hystrix, S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. i, p. 41, pi. vi, fig. 3. 

 1873-5. Defrancia hystrix, Seguenza, Boll. R. Com. Geol. Italia, vol. iv, p. 298, no. 128, 1873; vol. vi, 



p. 208, no. 196, 1875. 

 1881. Pleurotoma hystrix, Nyst, Conch. Terr. Tert. Belg., p. 46, pi. iii, fig. 13. 

 1890. Homotoma hystrix, Sacco, Boll. Soc. Geol. Ital , vol. ix, p. 281, no. 4279. 

 1890. Clathurella hystrix. Cams, Prod. Faun. Medit., vol. ii, p. 424. 

 1905. Clathurella (Cordieri) hystrix, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iii, p. 357, 



pi. xcvi, fig. 20. 

 1910. Peratotoma hystrix, Cerulli-Irelli, Palaeout. Ital., vol. xvi, p. 56, pi. v, fig. 22 — 24. 

 1912. Pleurotoma hystrix, Tesch, Med. v. d. Rijks. v. Delfstoffen, pt. iv, p. 90, no. 232. 



Specific Characters. — Shell rather fragile, subfusiform, slender, elongate, 

 turreted ; whorls convex, angulated above, the last about half the total length, 

 excavated below ; ornamented by fine, numerous longitudinal and transverse ridges, 

 acutely papillate or spiny where they intersect, which gives the shell a quadrately 

 clathrate appearance ; suture deep, channelled ; mouth ovate, angulate above ; 

 canal rather short, not continuous with the outer lip. 



Dimensions. — L. 14 — 20 mm. B. 5 — 8 mm. 



Distribution. — Recent : Mediterranean — Provence, Sardinia, Naples, Sicily, 

 Catania, Tunis ; Madeira. 



Fossil : Coralline Crag : Sutton. Waltonian : "Walton -on -Naze, 

 Little Oakley. Scaldisien : Belgium, Holland. 



Lower Pliocene : Zinola. Upper Pliocene : Biot, Monte Mario, Bologna, 

 Altavilla, Messina. Pleistocene : Messina, Monte Pellegrino, Ficarazzi. 



Remavlcs. — This is another of the southern species, not known as living further 

 north than the Mediterranean, which continued to exist in the Anglo-Belgian 

 basin as late as the Waltonian period. Wood records it from the Coralline Crag 

 and from Walton, and I have nearly twenty specimens in my collection from 



