94 LITTORINID^.. 



On the west coast of Scotland it has 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 crenidata^ 

 calatJms 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 rounded, en- 

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

 near the sutures : throat smooth. 



Plate LXXVIII, fig. 8, 9. 



'J'arbo siriaius, Adams^ Trans. Linn. Soc. vol. iii. pi. 1.3, f. '25, 20 (probablj'). 



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



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



213.— Wood, Index Test. pi. 31, f. lOCi. 



„ semicostatus, Mont. Test. Brit. vol. ii. p. 326 ; Suppl. pi. 21, f. 5. — Maton 



