NASSA (AMYCLA) SEMISTRIATA. 329 



1870-1915. Nassa semistriata, A. Bell, Journ. de Conch., vol. xviii, p. 346, no. 209, 1870 ; Geol. Mag. 



vol. x, p. 452, 1873 ; Rep. Brit. Assoc. (Bath), p. 136, 1888 ; ( Leeds), pp. 410, 423, 1890 ; N. (Uzita) 



semistriata, Trans. Roy. Geol. Soc. Cornwall, vol. xii, p. 142, 1898; Ceo!. Mag. [6], vol. ii, p. 168, 



1915. 

 1878. Nassa semistriata, de Stefnni e Pantanelli, Bull. Soc. Malac. Ital., vol. iv, p. 101. 

 1882. Nassa semistriata, Bellardi, Moll. Terr. Terz. Piein., pt. iii, p. 145, pi ix, fig. 14. 

 1887. Nassa semistriata, Kobelt, Icon, sclialentrag. europ. Meeresconch., vol. i, p. 131, pi. xxiii, 



figs. 16—25. 

 1890. Nassa semistriata, Sacco, Boll. Soc. Geol. Ital., vol. ix, p. 219, no. 2801. 

 1890. Nassa semistriata, Cams, Prod. Faun. Medit., vol. ii, p. 398. 

 1892. Nassa semistriata, Locard, Coq. mar. Cotes de France, p. 82, fig. 69. 



1901. Zeuxis (Amycla) semistriata, Cossmann, Ess. Paleoconch. compar., vol. iv, p. 211, pi. ix, fig. 17. 

 1907. Nassa semistriata, Scalia, Atti Accad Gioen. Sci. Nat. Catania [4], vol. xx, p. 35, no. 308. 

 1913. Nassa (Amycla) semistriata, Gignoux, Ann. Univ. Lyon, n. s. [1], vol. xxxvi, p. 510. 



Specific Characters. — Shell small, sub-ovate ; whorls 7, convex, the last tumid, 

 much the largest, all without longitudinal costse ; the apical whorls smooth, the 

 next two ornamented with fine inconspicuous transverse striae, all the others but 

 the last being without sculpture, except one prominent groove below the suture 

 which occurs in all of them, the body-whorl having in addition some rather distant 

 grooves on the lower part only, extending to the base; mouth large, sub-oval, 

 angulate above ; outer lip thin, gently curved, ridged within ; inner lip forming 

 a wide glaze on the pillar ; pillar excavated ; canal very short. 



Dimensions. — L. 13 mm. B. mm. 



Distribution. — Recent : Mediterranean, "West European. 

 Fossil : St. Erth. 



Miocene, Lower Pliocene : Italy. 



Upper Pliocene : Italy, Sicily. 



Pleistocene : Tuscany, Calabria, Sicily. 



Remarks. — This species is unknown to me from the Anglo-Belgian region, 

 though an allied shell, N. labiosa, is common in the Waltonian Crag, especially at 

 Oakley. It was reported from Wexford by Sir H. James and Prof. Forbes, 1 but 

 whether the typical N. semistriata occurs there seems to me doubtful ; the original 

 specimen cannot now be traced. 



Bellardi described several other forms of this group as specifically distinct, 

 under the names, for example, of A r . italica, N. Edwardsi, N. Hoernesi, and 

 N. gigantula, some of them having longitudinal costse on the upper whorls while 

 others are spirally grooved throughout. He lays special emphasis, however, on 

 the partly striated character of what he regards as the true N. semistriata. 



The shell here figured under that name is from the Lower Pliocene (argiles 

 bleues) of the Ligurian coast ; it is the short, partly striated, typical A 7 , semistriata 

 of Brocchi and Bellardi, and may be useful for comparison with any examples of 



Possibly this was N. labiosa, a specimen of which has been found recently in the Wexford gravels. 



