the Palaeozoic Bivalved Entomostraca. 225 



the middle of the valve it touches the lower end of the narrow 

 dorsal sulcus above mentioned. The marginal ridge is in 

 some specimens acute, and in others it scarcely rises above the 

 general surface of the valve. 



In a bed of grey micaceous limestone in the Upper Ludlow 

 rocks at Hales End, three miles north-west of Malvern ; it is 

 not uncommon. 



The other known forms of Kirkbya are — 



Kirkbya permiana, Junes, in King's Monog. Perm. Foss. (Pal. Soc), 1851, 



p. 66, pi. 18. fig. 1; Trans. Tyneside Field Club, vol. iv. p. 129, pi. 8. 



tigs. 1-3. Permian and Carboniferous; Britain. 

 , var. glypta, Jones, Monog. Perm. 1. c. fig. 12 ; Trans. Tynes. I. c. 



figs. 4-7. Permian ; Britain. 

 , var. Richteriana, Jones, Trans. Tynes. I. c. fig. 8. Permian ; 



Germany. 

 , var. Roessleri, Meuss (sp.), Jabresb. Wetter. Ges. 1854, p. 70, 



fig. 1 1 ; Trans. Tynes. I. c. fig. 9. Permian ; Germany. 

 , var. Schrenkii, Keyserh'ng (sp.), in Scbrenk's Reise Nord. 



Russl. &c. p. 112, pi. 4. fig. 37. Permian; Nortb Russia. 



, var. sticta, Keys, (sp.), ibid. fig. 38. Permian ; Nortb Russia. 



, var. grapta, Keys, (sp.), ibid. fig. 39. Permian ; North Russia. 



(Some, if not all, of tbese may be distinct species ; for the soft parts 

 may have varied more than the carapaces. — T. R. J.) 



annectens, J. $ K MS., An. N. H. s. 3. xviii. 42, &c. ; Trans. Geol. 



Soc. Glasgow, ii. 220. Carboniferous ; Ireland and Britain. 

 costata, M'Coy, sp., Synops. Carb. Foss. Ireland, p. 165, pi. 23. fig. 11; 



An. N. H. /. c. p. 43. Carboniferous ; Ireland and Britain. 

 Eichwaldiana, J.SfK. MS., Trans. Geol. Soc. Glasgow, ii. 221. 



Carboniferous ; Britain. 



oblonga, J. fy K MS., ibid. p. 221. Carboniferous ; Britain. 



plicata, J. cy K. MS., ibid. p. 221. Carboniferous; Britain. 



Scotica, J. § K MS., ibid. p. 220. Carboniferous ; Britain. 



spinosa, J. 8f K. MS., ibid. p. 220. Carboniferous ; Britain. 



striolata, Eichwald, sp., Leth. Ross. livr. vii. p. 1348, pi. 52. fig. 14. 



Carboniferous ; Russia. 

 umbonata, Eichwald, sp., ibid. p. 1347, pi. 52. fig. 10 ; Trans. Geol. 



Soc. Glasgow, ii. p. 221. Carboniferous ; Russia. 

 Urei, Jones, Trans. Tynes. Nat. Field Club, iv. 136 ; Trans. Geol. 



Soc. Glasg. ii. 220. Carboniferous ; Britain. 



Mooeea, Jones & Kirkby, MS. 



During an examination some time since of a series of bi- 

 valved Entomostraca collected by Mr. Charles Moore, F.G.S., 

 from the contents of some fissures in the Carboniferous Lime- 

 stone of Somersetshire and elsewhere, Messrs. Jones & 

 Kirkby discriminated a few specimens having simple, thick, 

 flattened carapace-valves, longer on the dorsal than the ventral 

 margin, without any subcentral pit, and ornamented with 

 narrow, rounded ridges, following more or less closely and 

 completely the marginal contour. Some Kirkbyce are but 



