642 PLIOCENE MOLLUSC A. 



1842—48. Eissoastriata, S.Y.Wood, Ann. Mag. Nat. Hist. [1], vol. ix, p. 534,1842; Mou. Crag 



Moll., pt. i, p. 100, pi. xi, fig. 1, 1848. 

 1853. Rissoa striata, Forbes and Hanley, Brit. Moll., vol. iii, p. 94, pi. ixxviii, tigs. 8, 9. 



1858. Onoba striata, H. and A. Adams, Gen. Eec. Moll., vol. i, p. 332, pi. xxxv, fig. 4. 



1859. Bissoa striaia, Gr. B. Sowerby, 111. lud. Brit. ShfUs, pi. xiii, fig. 15. 



1867—84. Bissoa striata, Jeffreys, Brit. Conch., vol. iv, p. 37, 1867 ; vol. v, p. 208, pi. Ixviii, fig. 2, 

 1869; in Prestwicli, Quart. Joiirn. Geol. Soc., vol. xxvii, pp. 145, 491, 1871 ; R. {Cbigula) striata, 

 Proc. Zool. Soc. London, p. 123, 1884; R. striata, in Lamplugh, Quart. Jouin. Geol. Soc, vol. xl, 

 p. 319, 1884. 



1871. Rissoa striata, F. W. Harraer, Trans. Norf. Norw. Nat. Soc, vol. i, pt. iii, p. 46. 



1872. Bissoa striata, A. and E. Bell, Proc. Geol. Assoc,, vol. ii, pp. 204, 216. 



1874. Rissoa (Cingula) striata, Seguenza, Boll. R. Com. Geol. Ital., vol. v, p. 6, no. 415. 



1877. Rissoa striata, Dollfus, Mem. Soc. geol. Normandie, vol. vi, p. 517. 



1878. Onoha striata, G. O. Sars, Moll. Reg. Arct. Norv., pp. 172, 358, pi. xxii, fig. 3. 



1878. Rissoa striata, Reeve, Couch. Icon., vol. xx, y]. v, fig. 40. 



1879. Bissoa striata, Jas. Reeve, Trans. Norwich Geol. Soc, vol. i, p. 70. 

 1884. Onoba striata, Moiiterosato, Noni. Gen. e Spec. Conch. Medit., p. 67. 

 1890. Rissoa (Folinia) striata, Carus, Prod. Faun. Medit , vol. ii, p. 327. 



1892—98. Rissoa .striata, A. Bell, Rep. Yorks. Phil. Soc, p. 63, 1892 ; B. (Onoba) striata, Trans. Roy. 



Geol. Soc. Cornwall, vol. xii, p. 153, 1898. 

 1901. Onoba striata. Conch. Soc. List, Journ. of Conch., vol. x, p. 18, no. 347. 

 1901. Onoba striata, Brp'gger, Norges geol. Unders^gelse, No. 31, pp. 241, 549, 657, pi. v, fig. 13. 

 1913. Rissoa (Onoba) striata, Dautzenberg et Durouchoux, Feuille des Jeunes Natur., vol. xliv, p. 30, 



pi. ii, fig. 17. 



Specific Characters. — Shell minute, oblong, subcylindrical ; whorls 6, somewhat 

 compressed, the two lower ones being nearly equal in width, the others gradually 

 diminishing in size upwards, the last much the largest ; the uppermost without 

 sculpture, the rest being ornamented by numerous, exceedingly fine spiral lines, 

 and by a few short and slightly flexuous ridges on the upper part only of each 

 whorl, below the suture ; spire elongated, ending abruptly in a blunt point ; suture 

 distinct, rather deep ; mouth small, sub-ovate, angulate above; outer lip thin ; inner 

 lip reflected ; peristome continuous. 



Dimensions. — L. 3 — 4 mm. B. 1 — 1'5 mm. 



Distrihution. — Becevf .- British seas, widely diffused from the littoral to the 



coralline zones. Spitzbergen, Greenland, Iceland, B,ussian Lapland, Sea of 



Okhotsk, Lofoten Islands, Norwegian coast. Atlantic — Heligoland to TenerifTe. 



Mediterranean, ^gean. 



Fossil: St. Erth. Coralline Crag: Sutton. Icenian : Aldeby, 

 Beccles. 



Pleistocene : Bridlington, Clyde beds. Fort William. Selsey. Irish estuarine 

 clays. Grlacial and post-glacial : Christiania fiord. Norwegian shell-banks up to 

 460 feet. 



Remarks. — This very distinct and easily recognisable species, formerly grouped 

 with Bissoa, was referred to a sub-genus Ciiujii.Ui by Jeffreys and some other writers, 

 but is now generally regarded as belonging to the genus Onoha of H. and A. Adams. 



