﻿PLATE XXX. 



Fig. 



I, I a, "2. Tf'i(joiiia doiiyuta var. unyustata. Lye. Cornbrash, Scarborough. (Page 



154.) My collection. 



3, ;i a, :\ l),^d. „ „ The typical form. O.xford Clay, AVeyniouth. (Page 



154.) My collection. 



4, 5. „ ,, var. /a/a, Lye. Cornbrash, Scarborough. Also South 



Lincolnshire. (Page 154.) My collection. 



