ANNIVERSARY ADDRESS OF THE PRESIDENT. 



195 



Genera. Species. 





2 



2 











1 



1? 



Ecbinodermata 



3 



6 



Annelida 



.... none. 





Crustacea 



1 



1 



Bryozoa 



4 



4 





10 



16 





4 



5 

 'j 





3 



5 











1 



2 





3 



9 





none. 







32 



51 



It will be seen that, out of the 51 species, the two large connect- 

 ing groups are the Brachiopoda and the Cephalopoda. 



Professor Hull, in May 1880, communicated a paper to the Royal 

 Dublin Society " On the Relations of the Carboniferous, Devonian, 

 and Upper Silurian Rocks of the South of Ireland and those of 

 North Devon"* ; and although resembling his previous paper " On 

 the Geological Relation of the Rocks of the South of Ireland to those 

 of North Devon &c," it treats of the subject-matter in a different 

 light. Prof. Hull enters more into the palseophysical geography of 

 the south of Ireland and North Devon, as indicated by the relation 

 of the formations and areas respectively. In the south-west of 

 Ireland, north and south of Dingle Bay, the rock-groups which rise 

 into high elevations belong to the Dingle beds or Glengariff grits and 

 slates of Professor Jukes. The lowest beds of the Dingle promontory 

 do not reach the surface amidst the mountain-ranges to the south of 

 Dingle Bay. 



The Glengariff beds may measure about 10,000 feet in thickness. 

 There is a total absence of the Old Red Sandstone at the base of the 

 Carboniferous beds f . Contortions in the Glengariff beds are of earlier 

 date than the deposition of the Old Red Sandstone or Carboniferous 

 beds ; this therefore implies that between the Glengariff beds and 

 the Old Red Sandstone there is a vast amount of wanting strata, 

 indicative also of unrepresented time— in other words, a wide gap 

 and ^prolonged interval of time actually separates the two formations. 

 It is the representation or filling up of this gap that Prof. Hull en- 

 deavours to show through the uninterrupted sequence in the Middle 

 and Lower Devonian beds of North Devon, or through the whole 

 series from the lowest Devonian up to the base of the Carboniferous 



* Proc. Royal Dublin Soc. vol. i. new series, 1880, pp. 135-150. 

 t Hull, " On the Geological Age of the Rocks forming the Southern High- 

 lands of Ireland," Quart. Journ. Geol. Soc. vol. xxxv. p. 699 et seq. (1879). 



