Palaeozoic Bioalced Entomostraca. 177 



List of Species and Varieties 0/' Kirkbya. 



/v. umbonata, permiana, spiralis, and costata have been 

 found in the Scar Limestone of the North -west of England 

 and K. plicata in the Carboniferous Limestone of the South- 

 west of the same country. How far these rocks may be in 

 part equivalent to the Calciferous Sandstone or Lower Carbo- 

 niferous series of Scotch geology we are unable to say ; but to 

 some extent they undoubtedly are so (as already suggested by 

 other writers), though we may probably have to go lower 

 than the base of the Scar Limestone to find anything on the 

 same horizon as the Lower Calciferous Sandstone beds of the 

 South-east of Scotland. 



1. Kirkbya permiana, Jones. (PI. III. fig. 1.) 



Dithyrocaris p< rmiana, Jones, 1850, in King's ' Monograph of Permian 

 Fossils' (Palseont. Soc), p. 66, pi. 18. figs. \n~d. 



