320 PLIOCENE MOLLUSCA. 



1867-9. Nassa nitida, Jeffreys, Brit. Conch., vol. iv, p. 349, 1807; vol. v, p. 219, pi. lxxxvii, fig. 4, 



1869. 

 1870-92. Nassa nitida, A. Bell, Journ. de Conch., vol. xviii, p. 346, no. 207, 1870 ; Eep. Brit. Assoc. 



(Bath), pp. 135, 139, 1888; (Leeds), pp. 417, 420, 1890 ; Ann. Rep. Yorks. Phil. Soc, p. 63, 1892. 

 1872-7. Nassa nitida, F. W. Harnier, Trans. Norf. and Norw. Nat. Soc, vol. i, pt. iii, p. 46, 1872 ; 



in Skertchly, Mem. Geol. Surv. (Fenland), p. 202, 1877. 

 1882. Nassa reticulata, var. A, Bellardi, Moll. Terr. Terz. Piem., pt. iii, p. 48, pi. iii, fig. 6. 

 1882. Nassa reticulata, var. nitida, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Rouss., vol. i, \>. 51, 



pi. x, figs. 10, 11. 

 1887. Nassa reticulata, var., Kobelt, Icon, schalentrag. europ. Meerescouch., vol. i, p. 136, pi. xxiv, 



figs. 16 — 22 ; pi. xxv, fig. 4. 

 1890. Nassa reticulata, var. nitida, Carus, Prod. Faun. Medit., vol. ii, p. 393. 



1911. Nassa reticulata, var. nitida, Cerulli-Irelli, Palaeont. Ital., vol. xvii, p. 247, pi. xxii, figs. 31 — 34. 

 1913. Nassa reticulata, var. nitida, Gignoux, Ann. Univ. Lyon, n.s. [1], vol. xxxvi, p. 507. 



Varietal Characters. — Differs from the type in size, in its fewer and stronger 

 longitudinal costae which are more prominent than the transverse striae, and not so 

 distinctly granulate ; the spire is turreted and shorter in comparison ; the inner lip 

 is thinner and not denticulate, the pillar having a slighter fold. 



Dimensions. — L. 18 — 24 mm. B. 12 — 15 mm. 



Distribution. — Recent: Falmouth, muddy estuaries of the Thames and Orwell, 

 Norfolk coast with N. reticulata, probably elsewhere in Great Britain. 



Brittany, Mogador, Adriatic, Portuguese coast. Mediterranean, Cannes, Nice, 

 Orbitello, Cette (Carus). 



Fossil: Hunstanton, March, Nar Valley, Bridlington, Selsey, 

 Worden (A. Bell), Wexford, Killiney, Irish estuarine clays. 



Italian Pliocene : Vezza, Monte Mario and elsewhere. Biot. 



Remarks. — Originally described by Jeffreys, though with some misgiving, as 

 specifically distinct, it has been regarded more generally as a variety of -A 7 , reticulata. 

 Jeffreys' view appears to have been based principally on the belief that the two 

 forms had not been found living together, but I have obtained both, not only 

 recent at Brancaster on the Norfolk coast, but fossil also in some neighbouring 

 Pleistocene gravels at Hunstanton. It might probably be met with elsewhere in 

 British seas if specially looked for. According to Jeffreys N. nitida is a brackish 

 water rather than a marine form, characteristic of muddy estuaries. Dr. Gignoux 

 regards it as more littoral than the type N. reticulata. It closely resembles the 

 fossil figured by Risso in 1826 (op. eit.) as Planaxis mammilata, as well as the 

 recent shell described by Blainville (op. eit.) as Buccinum reticulatum.. 



Nassa (Hinia) reeticostata (Bellardi). Plate XXXIII, fig. 27. 



1882. Nassa reeticostata, Bellardi, Moll. Terr. Terz. Piem., pt. iii, p. 45, pi. iii, fig. 2. 



1885. Nassa reeticostata, S. V. Wood, Quart. Journ. Geol. Soc, vol. xli, p. 68. 



1886, Nassa reeticostata, Kendall and Et. Gr, Bell, Quart. Journ. G-eol. Soc, vol. \lii. p. 210. 



