Paleozoic Bivalved Entomostraca. 455 
almost obsolete. B. dilobata (Miinster) israre. This species, 
in fact, is never plentiful, either in the Yoredale Rocks or in 
the Scar Limestone, where it is more often seen. 
The presence of av8ingle carapace of Bythocythere Young- 
ana, J. & K., is of interest, for it is otherwise known only 
from Brockley, Lanarkshire, and Lowick, Northumberland. 
Phreatura concinna, J. & K. (Pl. X XI. figs. 3 a, b), occurs 
both at Hurst and Downholme; and the specimens, which 
are all carapaces and not single valves, agree exactly in size 
and other features with the type examples from Gleaston 
Castle, 4 miles N.E. of Barrow-in-Furness, which is the only 
other locality known for this species. 
2. Listof Species from Downholme (Yoredale Series). 
1. Cytherella recta, J. & K.* 
2; reticulosa, J. & K.* 
3. intercalaris, sp.n. (Pl. XXI. fig. 4.) 
4, Leperditia Okeni (Miinster), Ann. & Mag. Nat. Hist. ser. 3, vol. xv. 
1865, p. 486, pl. =x. figs. 1 a-c, 2 a-c, 3. 
5. P —— sp. 
6. Kirkbya permiana, Jones *. 
7. —— Uret, Jones *, 
8. spinosa, J. & K., Ann. & Mag. Nat. Hist. ser. 5, vol. xv. 
1885, p. 185, pl. iii. figs, 12 a, 6. 
9. oblonga, J. & K.* 
10. Bairdia Hisingert (Minster) *. 
plebeia, Reuss *. 
12. —— brevis, J. & K.* 
subelongata, J. & K.* 
submucronata, J. & K., Quart. Journ. Geol. Soc. vol. xxxv. 
1879, p. 572, pl. xxix. tigs. 12-18. 
15. Bythocypris bilobata (Minster) *. 
16. —— cuneola, J. & K.* 
cornigera, J. & K.* 
18, Argillecia (Bythocypris?) equalis (?), J. & K., Ann. & Mag. Nat. 
Hist. ser. 5, vol. xviii. 1886, p. 263, pl. ix. fig. 6a. 
19. Youngiella rectidorsalis, J. & K.(Youngia) Proceed. Geol. Assoc. 
vol. ix. 1886, p. 515, woodcuts, figs. 6-7. (Pl. XXI. 
figs. 5 a-d.) 
20. Phreatura concinna, J. & K.* 
Among the Cytherelle from Downholme are some smooth, 
plump, subovate carapaces that are difficult to determine. 
In lateral outline they somewhat resemble C. scrobiculata, 
but have none of its other features. Their relative height 
(width) is too great for the highest examples of C. Benniet, 
J.& K., that we have seen, though, with this exception, they 
would come near to that species in general outline. They 
have some resemblance also to the smaller species, C. brevis, 
* Also from Hurst; see p. 453. 
