652 PLIOCENE MOLLUSCA. 



Dlmensiots. — L. 18 mm. B. 16 mm. 



Distribution. — Not recorded living. 



Fossil: Iceiiian Crag: Bramerton and elsewhere. 



Remarks. — This shell may be taken as typical of a short-spired iind strongly- 

 carinated group, not nncommon at Bramerton, departing widely from the variety 

 .'sulcata. Originally regarded by S. Woodward as specifically distinct, it was sub- 

 sequently considered by Wood and others as a variety of L. littorra. 



Var. bicarinata (S. Woodward). Plate LII, figs. 23, 24. 



1833. Turbo hicarinatus, S. Woodward, Geol. of Norfolk, p. 44, pi. iii, fig. 13. 



1848. Littorina littorea, var. bicarinata, S. V. Wood, Mon. Crag Moll., pt. i, p. 118, pi. x, fig. 14 e. 



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



Varietal Characters. — Shell of moderate size, ornamented by strong and pro- 

 minent ribs (generally two), having a spire varying in length, and in the tyj)e form 

 an expanded base ; suture deeper than in the variety carinata. 



Dhiensioiis. — L. 18 mm. B. 12 mm. 



Distribution. — Not recorded living. 



Fossil : Icenian Crag : Bramerton. 



Remarks. — This variety is most nearly allied to the carinata group, from which 

 it differs in its stronger ribs, its longer spire and its deeper suture. 



Var. angulata, nov. Plate LII, fig. 25. 



Varietal Characters.- -Shell of moderate size, thin and delicate ; whorls 6, 

 convex, angulated, with a wide sloping shelf below the suture, the last whorl 

 much the largest; ornamented by fine spiral lines and two or three distinct ridges; 

 spire elongate, rapidly diminishing upwards to a sharp point ; suture deep ; mouth 

 rather large, somewhat expanded, angulated by one of the spiral ridges ; outer lip 

 thin ; inner lip widened. 



Distensions. — L. 18 mm. B. 14 mm. 



Distribution. — Not known living. 



Fossil: Icenian Crao- : Bramerton. 



R.emarl-s. — ^This charming little shell seems to differ from anything figured by 

 Wood. Our specimen l)elongs to the collection of Bramerton fossils at the 

 Norwich Castle Museum. 



Var. truncata, nov. Plate LII, fig. 26. 



Diiiu'iisioiis. — ]j. 20 mm. B. 15 mm. 

 JHsli'iliiilion.-^Not recorded living. 



Fossil: Icenian C.rag : iJi'aniorton. 



