424 PLIOCENE MOLEITSCA. 



The Marchese di Monterosato originally regarded G. minima as a variety of G. 

 tubercularis, but in a subsequent work reverted to Brusina's opinion that it was 

 specifically distinct. 



Mr. Marshall considers that the var. nana of Wood is the C. concatenate of 

 Conti, stating that under the latter name it has been taken in the western part of 

 the English Channel as far as the Scilly Islands, in Killala Bay, and in the 

 western Hebrides. 1 The variety nana of Jeffreys seems to be a different shell. 



Genus NEWTONIELLA, Cossmann, 1893. 

 Sub-genus SEILA, H. and A. Adams, 1861. 

 Newtoniella (Seila) trilineata (Philippi). Plate XLI, fig. 24. 



1836-44. Cerithium trilineatum, Philippi, Enum. Moll. Sic, vol. i. p. 195, pi. xi, fig. 13, 1836; vol. ii, 



p. 163, 1844. 

 1842-48. Cerithium trilineatum, S. V. Wood, Ami. Mag. Nat. Hist. [1], vol. ix, p. 537, 1842; Moil. 



Crag Moll., pt. i, p. 70, pi. viii, fig. 4, 1848. 

 1856. Cerithium. trilineatum, Homes, Foss. Moll. Tert. Wien, vol. i, p. 413, pi. xlii, fig. 19. 

 1867. Cerithium trilineatum, Speyer, Palaeontographica, vol. xvi, p. 211, pi. xxiii, fig. 9 ; pi. xxiv 



fig. 1. 



1871. Cerithium, trilineatum, Jeffreys in Prestwich, Quart. Jouru. Geol. Soc, vol. xxvii, pp. 143, 487. 



1872. Cerithium trilineatum, A. and R. Bell, Proc. Geol. Assoc, vol. ii, pp. 203, 210. 



1873. Cerithium trilineatum, Seguenza, Boll. B. Com. Geol. Ital., vol. iv, p. 348, no. 217. 



1874. Cerithium trilineatum, Van den Broeck, Ann. Soc Roy. Malac Belg., vol. ix, p. 134. 

 1886. Cinctella trilineata, Dollfus et Dautzenberg, Feuilles des jeunes Nat., vol. xvi, p. 105. 

 1890. Cerithium {Cinctella) trilineatum, Carus, Prod. Faun. Medit., vol. ii, p. 360. 



1890-5. Cerithium trilineatum?, Sacco, Boll. Soc Geol. Ital., vol. ix, p. 188, no. 2085, 1890 ; Cerithiella 

 (Seila) trilineata and vars., Moll. Terr. Tert. Piem., pt. xvii, p. 72, pi. iii, figs. 94, 95, 1895. 



1892. Cerithiojjsis trilineata, Locard, Coq. mar. Cotes de France, p. 118. 



1898. CeritMopsis (Cinctella) trilineata, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Rouss., vol. ii, 

 p. 796. 



1906. Neictoniella (Seila) trilineata, Cossmann, Ess. Pale'oconeh. compar., vol. vii, p. 153. 



1917. Seila trilineata, Monterosato, Moll. viv. e quat. Tripoli; Boll. Soc. Zool. Ital. [3], vol. iv. 



Specific GJtaracters. — Shell small, subcylindrical, subulate ; apex obtuse, 

 costated and cancellate ; Avhorls flattened ; ornamented by three obtuse spiral 

 ridges and by numerous exceedingly fine spiral stria? ; suture slight ; mouth sub- 

 quadrangular ; canal short and inflected, base rounded. 



Dimensions. — L. 9 mm. B. 2 mm. 



Distribution. — Recent: Mediterranean, iEgean, Tripoli. 



Fossil: Coralline Crag: Gedgrave, Sutton, Boy ton. Waltonian: 

 Walton-on-Naze, Little Oakley. 



1 Journ. of Conch., vol. xiii, p. 186, 1912. 



