458 Prof. T. R. Jones and Mr. J. W. Kirkby on the 
localities individuals occur having one end (posterior) bluntly 
pointed instead of being rounded like the other; and the 
Settle specimens, which are placed with this species, have this 
extremity more acuminate than any that have hitherto come 
under our notice, simulating somewhat Macrocypris Jonesiana, 
Kirkby, though not at all belonging to that species. Possibly 
it may be a new species, though just as likely it extends our 
knowledge of the old one. Any way, until other examples 
turn up it is retained in A. (B.?) equalis as var. acuta 
(PL XX. fig78), 
The only other specimen from Dowgill that requires notice 
is asmalltumid carapace (Pl. XXI. fig. 9) that has the dorsal 
border gibbose, being boldly arched, and the ventral feebly 
convex: it is highest and widest behind, with the anterior 
moiety of the carapace longer and more acute than the other 
portion. It also has the left valve overlapping the right 
moderately all round (most so ventrally), and the surface is 
smooth. 
This specimen much resembles Carbonia fabulina, J. & K. ; 
and had it been found in Coal-measures or other strata where 
that species might have been looked tor, it would very possibly 
have been referred to it. It differs, however, in the hinge- 
ment, which is more that of Bythocypris than Carbonia. 
Moreover, the latter seems to have been peculiar to the fresh 
or brackish waters of the Coal-measure areas; and, though it 
may have been occasionally commingled with estuarine and 
marine species, its occurrence among such a marine group as 
that in the Carboniferous Limestone of Dowgill would be 
very unlikely. We place it therefore with Bythocypris as 
Bb. breviata. 
In connexion with this new form, it may be mentioned 
that we have notes and a sketch of a similar Carbonia-shaped 
carapace from Braehead, Lanarkshire, in the collection of 
Dr. David Robertson, which had also been found along with 
marine fossils. It is, however, a little larger, and has the 
surface deeply pitted. 
4, With this notice of Carboniferous Ostracoda from York- 
shire may be mentioned a few species that we found in some 
washed shale sent us by Mr. Rhodes and Mr. James Bennie 
from the ‘‘Crow Beds, River Tees, Darlington,” though we are 
not certain whether the shale was obtained from the Yorkshire 
or the Durham side of the river. The species found are Leper- 
ditia Okeni, Kirkbya permiana, K. Uret, Bairdia plebeia, 
and B. brevis; none of these were plentiful, and all were 
flattened by pressure. Possibly the Crow Beds are referable 
