650 PLIOCENE MOLLUSCA. 



and tlie periphery ; spire of moderate length, regularly diminishing upwards, 

 ending in a fine point ; suture slightly channelled ; mouth ovate, angulate above ; 

 base rounded. 



Dimensions. — L. 20 mm. B. 15 mm. 



Distribution. — Not recorded living. 



Fossil : Icenian Crag : Bramerton, possibly elsewhere. 



Remarks. — This specimen from the Norwich Museum differs from anything 

 figured by Wood or otherwise recorded, and deserves notice. It belongs to the 

 sulcata group but differs from that variety in its regular and triangularly-conical 

 form and in the strong and prominent rib on the periphery. 



Var. elegans, S. V. Wood. Plate LII, fig. 18. 



1848. Littorina littorea, var. elegans, S. V. Wood, Mou. Crag Moll., pt. i, p. 118, pi. x, fig. 14 d. 

 1916. Littorina littorea, vai*. elegans, J. T. Marshall, Journ. of Couch., vol. xv, p. 44. 



Dimensions. — L. 20 mm. B. 14 mm. 



Distribution. — Recent: British coasts (Marshall). 

 Fossil : Icenian Crag : Bramerton. 



Remarks. — Resembles the var. sulcata in form l)ut the sculpture is more 

 delicate, the whorls are more regularly convex, not compressed, and the suture is 

 deeper. Wood's var. deformis seems a distorted specimen of the same shell. 

 Our specimen is from the Fitch Collection at the Norwich Museum. It has been 

 regarded by Mr. J. T. Marshall as a British shell, and as the equivalent of the 

 var. twrrita of Jeffreys. 



Var. delphinula, S. V. Wood. 



1848. Littorina littorea, var. del2)hinula, S. V. Wood, Mou. Crag Moll., pt. i, pi. x, fig. 14^. 



Remarks. — The specimen figured by Wood under this name may be a mis- 

 shapen form of tlie typical L. littorea, having a wide base, a large and projecting 

 mouth and a deep umbilicus. 



Var. elongata (S. Woodward). 



1833. Turbo elongatus, S. Woodward, Geol. of Norfolk, p. 44, pi. iii, figs. 16—18. 



1842—48. Littorina elongata, S. V. Wood, Auu. Mag. Nat. Hist. [1], vol. ix, p. 532, 1842 ; L. littorea, 



var. elongata, Mou. Crag Moll., pt. i, pi. x, tig. 14 A;, 1848. 

 1864. Litorina litorea, var. elongata, S. P. Woodward iu White's History of Norfolk, ed. 3, p. 118. 



Dimensions. — L. 16 mm. B. 8 mm. 

 Distribution. — Not known living. 



Fossil : Icenian Crag : Bramerton, Thorpe. 



