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FISSURELLA gra;ca. 

 TAB. CCCCLXXXIII. 



Spec. Char. Ovate^ oblongs convex^ radiated; ra- 

 dii decussated by elevated lines^ and thickened 

 at the intersections ; perforation smalls elonga- 

 ted ; margin of the base crenulated. 



Syn. Patella graeca Linn. &c, Brocchi, 2. 259. Fis- 

 siirella graeca, L«m. Si/st. 6. p. 2,11. Deshai/es, 

 Coquilles Foss. 2. p. 19. t. 2. Jig. 1, 8, and 9. 



There is a considerable degree of variation to be ob- 

 served in the number and proportion of the rays upon 

 the shell : but in general they are in sets, composed 

 of one large and two small ones ; and between each 

 set is a still larger ray. The base is arched and ovate, 

 with the anterior portion smallest. The surface is fre- 

 quently antiquated, especially in the fossil specimens, 

 vvhich have also smaller and more numerous rays than 

 the generality of recent ones ; but the latter are subject 

 to much variation, as observed above. 



Found in the Crag of Ipswich, many years ago, by our 

 valued friend the late Mrs. Cobbold, whose assiduity in 

 collecting Crag shells, and generosity in bestowing them, 

 have been so often proved in the course of this work, 

 that every lover of science must join us in lamenting her 

 loss, even if she had not possessed other high qualifica- 

 tions for which she was esteemed by all who knew her. 



The Rev. G. R. Leathes has also furnished us with 

 specimens. 



