PalcBOzoic Bivalved Entomostraca. 261 



Quany, Roscobie Quarry, in Fifeshire ; Kicllaw Quarry, 

 Burlage Quarry, in East Lothian ; Whitebaulks, Linlithgow- 

 shire; Barmullock Quarry, Williamswood, Brockley, Gair, 

 Robroystone, in Lanarksliire; Orchard Quarry, Renfrewshire; 

 Scales Green, Humphrey Head, in Lancashire. 



28. Kirlchya tricolUna, J. & K. (PI. VIII. fig. 19.) 

 Kirhbya tricollina, J. & K., MS. 1885, Geol. Mag. dec. 3, vol. ii. p. 540. 



Dorsal border straight or slightly incurved ; ventral border 

 convex ; extremities flatly rounded or subtruncate. Three 

 round tubercles form the chief character, one placed just above 

 the centre of valve, the others high up, one near each extremity. 

 Free margin strongly rimmed ; surface strongly reticulate ; 

 traces of a subcentral oval pit just below middle tubercle. 

 Length -^V inch. 



Rare in the Scar Limestone at Arnside, Westmoreland. 



29. Moorea obesa^ sp. nov. 

 (PL VIILfigs. 20 a, 20 5.) 



Subtriangular in outline, greatest length rather below the 

 dorsal border ; dorsal border incurved ; ventral and extreme 

 borders forming an inverted arch ; extremities pointed ; free 

 margins rimmed, a little inside of which is another and 

 stronger ridge, continuous and concentric ; main ai-ea of valve 

 smooth. Length -g'y inch. 



A very rare species, and only known from the debris of 

 Carboniferous Limestone in a vein at Brocastle, near Bridg- 

 end, Glamorganshire, where it was collected by Mr. Charles 

 Moore, F.G.S. 



30. Moorea tenuis^ sp. nov. (PL VIII. figs. 21 a, 21 5.) 



This species is from the debris of Carboniferous Limestone 

 in a vein at the Charterhouse lead-mine, Mendip Hills, Somer- 

 set, and it has much the outline of M. ohesa, but the dorsal 

 border is convex instead of incurved, and the valves are less 

 compressed. The inner ridge is also further away from the 

 margin and almost regularly oval in shape, thus not con- 

 centric ; the surface seems to have been smooth. Length 



To inch- 



These two species * and Moorea silurica^ J. & H. (Ann. 

 & Mag. Nat. Hist. ser. 4, vol. iii. p. 225, pi. xv. fig. 8), are 

 the only members of the genus known to us, and tliat but 



* These were referred to in the Quart. Journ. Geol. Soc. vol. xxiii, 

 1857, pp. 494, 523, and 559, as Moorea obesa and M. tenuis, Jones, MS. 

 (once with a misprint of " obtusa " for obesa) . 



