(556 PLIOCENE MOLLUSCA. 



Varietal Characters.— Oval, solid and smooth (Jeffreys). 



Dimensions. — L. 15 mm. B. 12 mm. 



Distribution. — Recent: British Seas — Channel islands to Shetland. 



Fossil: Bramerton, probably at other localities in the Icenian 



Crag. 



Remarks. — The fossil specimen figured under this name, one of several in my 

 cabinet from Bramerton, seems to correspond with Jeffreys' description of var. Isevis, 

 ami with some recent specimens under the same name in the Norwich Museum, one 

 of which is given with it for comparison. 



Var. jugosa (Montagu). Plate LIII, fig. 5. 



1803. Turbo jugosus, Montagu, Test. Brit., pt. ii, p. 586, pi. xx, fig. 2. 

 1867. Littorina rudis, var. jugosa, Jeffreys, Brit. Couch., vol. iii, p. 365. 

 1892. Littorina jugosa, Locard, Coq. mar. Cotes de France, p. 189. 

 1901. Littorina rudis, var. jugosa, Conch. Soc. List, Journ. of Conch., vol. x, p. 17. 

 1912. Littorina saxatilis, var. jugosa, Dautzenberg et Fischer, Camp. Scient., Prince de Monaco, 

 vol. xxxvii (Mollusques), p. 195, pi. ix, figs. 18 — 27. 



Varietal Characters. — Shell small, ornamented by strong and sharp spiral 

 ridges, variable in number ; spire short, pointed ; last whorl much the largest. 



Dimensions. — L. 8 — 12 mm. B. 8 — 10 mm. 



Distribution. — Recent : British coasts — Shetland to the English Channel. West 

 European. 



Fossil: Icenian Crag: Bramerton. Pleistocene: Portland. 



Remarks. — By some authors this form has been grouped with the var. patula. 

 It differs from the latter, however, in its sharp and distinct spiral sculpture. 

 Messrs. Dautzenberg and Fischer give several sub-varieties of it, distinguished by 

 the strength or otherwise of their spiral ribs. 



Var. globosa, Jeffreys. Plate LIII, figs. 6 — 8. 



1827—44. Turbo rudis, Brown, 111. Kec. Conch. Gt. Brit,, ed. 1, pi. xlvi, figs. 10, 11, 1827; Littorina 



rudis, ed. 2, p. 128, pi. x, figs. 10, 11, 1844. 

 1865. Littorina rudis, var. globosa, Jeffreys, Brit. Conch., vol. iii, p. 365. 

 1901. Littorina rudis, var. globosa, Conch. Soc. List, Journ. of Conch., vol. x, p. 17. 

 1912. Littorina saxatilis, subsp. rudis, var. globosa, Dautzenberg et Fischer, Camp. Scient., Prince de 



Monaco, vol. xxxvii (Mollusques), p. 197, pi. x, fig. 3. 



Dimensions. — L. 26 mm. B. 22 mm. 



Distribution. — Recent : Oban, Dublin Bay, Isle of Man. 



Fossil : Icenian Crag : Bramerton. 

 Remarks. —The shells here figured are from my own collection and were found 

 t Bramerton. They are larger than our typical L. rudis which is so common at 



