94 LITTORINID^. 



On the west coast of Scotland it lias been taken at Oban 

 (Jeffreys) ; in the Orkneys it occurs among corallines, 

 though scarce ; in fifteen fathoms, Eda Sound, and seven 

 fathoms, Sanda Sound (Thomas). " On each side of the 

 Irish coast" (W . Thompson); Tarbert, in Galway (Jeff- 

 reys) ; Clew Bay, in seven fathoms (E. F.) 



Southwards it ranges to and throughout the Medi- 

 terranean, and into the Black Sea : northwards, it has 

 been taken by Loven on the coast of Bohuslan, Sweden. 

 The Rev. D. Landsborough has found it fossil in raised 

 beaches at Largs, in Ayrshire, in company with crenulata, 

 calathus and striatula. These beaches must not be con- 

 founded with the pleistocene fossiliferous strata, which are 

 often regarded as of the same age and origin, but really 

 belonging to a prior epoch, one during which our seas 

 were in conditions comparable to those prevailing on the 

 coast of Labrador and Greenland now. The latter, more- 

 over, are not (except in comparatively few instances) 

 beaches, but elevated sea-bottoms. The true raised beaches 

 of later age indicate rather a slightly warmer temperature 

 in the sea of the Clyde district, due probably to a temporary 

 extension of warm currents northwards. 



R. STRIATA, Montagu. 



Cylindraceous below, tapering above ; whorls roundetl, en- 

 circled with raised lines, and usually, also, longitudinally ribbed 

 near the sutures : throat smooth. 



Plate LXXVIII, fig. 8, 9. 



Turbo striutus, Adams, Trans. Linn. Soc. vol. iii. pi. 13, f. 25, 26 (probably). 



— Mont. Test. Brit. vol. ii. p. 312. — Maton and Rack, Trans. 



Linn. Soc. vol. viii. p. 173. — Dillw. Recent Shells, vol. ii. p. 



2L3.— Wood, Index Test. pi. 31, f. lOG. 



„ semicostatus, Mont. Test. Brit. vol. ii. p. 320 ; Suppl. pi. 21, f. j. — Maton 



