CORRIGENDA. 



Part I, p. 11, for "Purpuroidea Moreausia," read "P. Morrisii, Buv. ;" Purpura Moreausia, is considered 

 by M. Buvignier to be a distinct species, 

 p. 48, for " Eulima pygmaea," read "Eulima vagans (junior)." 

 p. 93, for "Patella nana," read " Patella cingulata (junior)." 

 Part II, p. 24, for " Inoceramus Fittoni, Tab. iv," read "Tab. iii." 



p. 48, sixth line from the bottom, erase tbe four words within the parenthesis. 



p. 49, second line, erase tbe last three words. The raised ledge which supports the anterior 

 muscular impression in Macrodon separates it from other sub-genera of Area ; in Cucullsea the 

 ledge is posterior. 

 p. 7o. Both Cypricardu Bathonica, d'Orb. and C. cordiformis,Desh., occur in the Inferior Oolite of 

 the Cotteswolds but in different beds, further observations have induced us to regard them as 

 ouly varieties of the same species induced by peculiarities of the beds in which they occur. 



