258 Prof. T. E. Jones and Mr. J. W. Kirkbj on the 



Localities. In the Carboniferous-Limestone series, at 

 Murrayfield Pit, Linlithgowsliire. 



In Lower Carboniferous : Cam Beck, Cumberland ; Pla- 

 shetts, Northumberland. 



• 20. Beyrichia fodicata, sp. no v. (PI. VIII. figs. 4, 5, 6.) 



Oblong; dorsal border straight, ventral border straight or 

 slightly convex ; extremities rounded ; valves divided into 

 three or four lobes by deep sulci, the posterior lobe sometimes 

 curving round ventrally to near the anterior third ; surface 

 smooth. Length ^-V iuch. 



The only specimens we have seen of this species are single 

 valves, collected by Mr. James Bennie from tlie Carboniferous- 

 Limestone series (Upper) at Linlithgow Bridge. 



21. Beyricliia tuherculospinosaj sp. no v. 

 (PI. VIII. figs. 7, 8.) 



A small, subovate, rather compressed species, very curiously 

 tuberculated and spiked. The two specimens figured have 

 four or five round tubercles and a postero-dorsal spike on each 

 valve. These features vary, however, in number in other 

 specimens ; some have two or three spikes on each valve, 

 others have none, but only tubercles, and others again have 

 more tubercles than here figured. Length 4-^ inch. 



Mr. John Young discovered this species in the Carboni- 

 ferous-Limestone series at Boghead Quarries (Hamleton), 

 Lanarkshire ; it also occurs in the same series at Stacklaw- 

 hall (Stewarton), Ayrshire; Craigenglen, Stirlingshire; 

 Murrayfield, Linlithgowshire ; Sunnybank Quarry, Fife- 

 shire ; Skellygate (Ridsdale), Northumberland. 



22. Beyricliia multiloba^ J. & K. 

 (PI. VIII. figs. 9 a, 9 ^', 9 c.) 



Beyricliia multiloba, J. & K., MS. 1867, Trans. Geol. Soc. Glasgow, 

 vol. ii. p. 219. 



Another small Beyricliia with the surface of its valves broken 

 up into three or four mammiform or clavate lobes (the centre 

 one of which projects above the dorsal border) by deep and 

 wide sulci. In general form it is almost subpentagonal, being 

 straight above, subangular below, and nearly truncate at the 

 extremities, the anterior of which is the smallest; the right 

 valve is largest and overlaps the left ; the surface is faintly 

 reticulated (with large meshes). Seen from above (or below) 



