668 PLIOCENE MOLLUSCA. 



Lacuna divaricata (Fabricius). Plate LIIT, fig. 30. 



1780. Turbo divarieatus, Fabricius, Faun. Grcenl., p. 392. 



1803. Twbo run-tut, Montagu, Test. Brit., pt, ii, p. 307, Suppl., pi. xx, fig. 3. 



1841—70. Lacuna vincta, Gould, Rep. Iuv. Mass., ed. 1, p. 262. fig. 1G9, 1841 ; ed. 2. p. 302, fig. 573. 



1870. 

 1846. Lacuna divaricata, Loven, K. Svensk. Vet, -Acad. Forh., vol. iii, p. 95. 

 1850—72. Lacuna vincta, S. V. Wood, Mon. Crag Moll., pt. ii, p. 316. pi. xxxi, fig. 13. 1850 ; 



1st Suppl., pt. i, p. 80, 1872. 

 1853. Lacuna vincta, Forbes and Hanley, Brit. Moll, vol. iii, p. 62, pi. lxxii, tigs. 10 — 12; pi. lxxiv, 



figs. 7, 8; pi. lxxxvi, figs. 6—8. 

 1859. Lacuna vincta, G. B. Sowerby, 111. Ind. Brit. Shells, p. xii, figs. 27, 28. 

 1863—84. Lacuna divaricata, Jeffreys, Rep. Brit. Assoc. (Newcastle), Trans., p. 77. 1863 ; Brit. 



Conch, vol. iii, p. 346, 1867 ; vol. v, p. 204, pi. lxiv. fig. 3, 1869 ; in Prestwich, Quart. Journ. Geol. 



Soc, vol. xxvii, p. 488, 1871 ; Proc. Zool. Soc, p. 109, 1883 ; in Lam pi ugh. Quart. Journ. Geol. See.. 



vol. xl, p. 319, 1884. 

 1870 — 92. Lacuna vincta, A. Bell, Journ. de Conch., vol. xviii, p. 352, no. 401, 1870 ; L. divaricata, 



Rep. Brit. Assoc. (Leeds), pp. 413, 417. 420; Proc. Roy. Phys. Soc Edin., vol. x, pp. 292, 296, 



1890; Proc. Roy. Irish Acad. [3], vol. ii, p. 258, 1892 ; Yorkshire Naturalist. No. 723. p. 96, 1917. 

 1872. Lacuna divaricata, A. and R. Bell, Proc. Geol. Assoc, vol. ii. pp. 213, 216. 

 1878. Lacma divaricata, G. O. Sars, Moll. Reg. arct. Norv., pp. 169, 358, pi. xxi, fig. 22. 

 L892. Lacuna divaricata, Locard, Coq. mar. Cotes de France, p. 193, fig. 169. 

 1898. Lacuna vincta, Posselt, Medd. om. Groul., vol. xx iii. p. 228. 

 1901. Lacuna divaricata, Brogger, Norges geol. Undei s^gelse, No. 31, pp. 380, 430, 508, 653. pi. ix, 



fig.' 21. 

 1908. Lacuna divaricata, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iv. p. 73. pi. cxi, figs. 



30-34. 

 1910. Lacuna divaricata, Odhner, K. Svensk. Vet.-Akad. Handl. Stockholm, vol. vii, pp. 8, 23. 

 1910. Lacuna divaricata, de Geer, Geol. Foren. Forh., vol. xxxii. Analysis. 

 1915. Lacuna vincta, Johnson, Bost. Soc. Nat. Hist., Occ papers, vol. vii, Fauna of New England, 



No. 13, p. 121. 



Specific Characters. — Shell rather thin, semitransparent, expanded and rounded 

 at the base ; spire elongate, ending in a blunt point ; whorls <>. compressed, the last 

 much the largest; suture oblique, distinct, but not deep; mouth wide, expanded 

 below ; outer lip thin. 



Dimensions. — L. lo mm. B. 6 mm. 



Distribution. — Recent: British seas, abundant at low water mark and in the 

 laminarian zone. Circumpolar — Iceland, Faroes, Finmark, Greenland, Canada, 

 Alaska ; ranging also through Scandinavian coasts to Gulf of Gascony, north- 

 eastern American coasts to New York, North Japan. 



Fossil: Icenian Crag (Jas. Reeve), rare. Pleistocene beds of England, Scotland 

 and Ireland, Clyde beds, Blackpool, Gloppa, Macclesfield, Moel Tryfaen, Aberdeen- 

 shire, Bridlington, Holderness, Kelsey Hill, March gravels, Selsey, Southampton 

 docks and elsewdiere. 



Uddevalla, Christiania fiord — from upper Area beds to 2'apes-banks. 



