of the North of Ireland, 



169 



GENEKA. 



SPECIES. 



PLACES. 



Belemnite .... 





Colin Glen and 



Donald Hill 



Colin glen 



Ibid. 



Ibid. 



Ibid. 



Ibid. 



Ibid. 



Belfast Mountains 



Colin glen 



Ibid. 



Ibid. 



Ibid. 



Ibid. 



Carrickfergus 



Belfast Mountains 



Venus ? Lin 



Ostrea 



fragment of 



Crista Galli 



edulis 



Ostrea 



Area. 



Glycimeris 



Pecten 



varia 



Anomia 





Ditto 



Gryphus, two varieties 



Crista GalH 



lithophagus 



Lin. Tr. V. 8. p. 6.f. 1 



My tilus 



Ditto 



Cardium ? 



Serpula 





Dentallum 



Pinna 



hexangulum 



laevis ? 



Echinus 







F. ChalL 



The chalk formation in Ireland has hitherto been frequently- 

 distinguished by the name of white limestone, its compact texture 

 having caused those who w^ere acquainted only with the superior 

 beds of the English chalk formation to hesitate in admitting their 

 identity : the occurrence of the cornu ammonis among the fossils 

 of the Irish chalk was also supposed to furnish another distinctive 

 character; in both these circumstances, however, it agrees with 

 the lower beds of the English chalk ; further, its geological position, 

 (reposing as it does on the same bed of calcareous sandstone, with 

 chloritic grains, which supports the English chalk) the analogy 



Vol. III. Y 



