Paleozoic Bivalved Entomostraca. 459 
to strata associated with one or two seams of coarse coals, 
locally termed “ Crow Coals,” that occur in the Yoredale 
Rocks of North Yorkshire and Durham. 
Higher up the ‘es, near to Barnard Castle, Dr. James 
Barron, of Sunderland, found a shale containing Leperditia 
Okeni, Kirkbya permiana, Beyrichia sp., and Bairdia plebeva, 
associated with marine fossils. 
Lastly, many years ago we received from Mr. J. H. Burrow, 
of Settle, some fragments of “ Lower Scar-Limestone ” con- 
taining specimens of Bazrdia and evidently varieties of 
B. plebeia. 
The adjoining Table includes all the species of Carboniferous 
Ostracoda (the Cypridinide and allied families excepted) 
already known from Yorkshire. Rather oddly, there is not 
a single form to record as known from the Upper Coal- 
measures, nor from any horizon in the Lower Coal-measures, 
Gannister Beds, and Millstone-Grit, notwithstanding the thick- 
ness of these deposits and the wide area of their outcrop. 
Table of Ostracoda occurring in the Carboniferous 
Rocks of Yorkshire. 
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