DAYIDSOX — OX SCOTTISH CAEBOXIFEROUS ERACHIOPODA. 



25 



vexity, as well as in the character of their ribs, Tvhich either cover the entire 

 shell, or become obsolete towards the beaks. When perfect, the valves pos- 



Lign. 7. — Camarophoria crumena. 



Fig. 1.— Interior of the Dorsal Valve. Fig. 2.— Interior of the Ventral Valve. 



A, adductor, or occlnsor muscular impressions (?) ; C, curved processes, to vrhich were 

 affixed the fleshy spiral arms ; D, deltidium ; E, teeth ; H, conjoined dental plates or trough- 

 shaped process ; J, cardinal process ; K, sockets : M, marginal expansions : O, spatula- 

 shaped process, or visceral support ; R, cardinal, or divaricator muacular scars (?) ; S, septum. 



sessed marginal expansions, but which are rarely preserved in the fossil. The 

 mesial fold differs in width and elevation according to the number of ribs which 

 ornament its surface, these varying from two to seven, each valve beiog fur- 

 nished with from twelve to twenty ribs. The siiius is of moderate depth. 



Of tliis species I am acquainted with but a single well-authenticated example, 

 which was found many years ago in West Lothian by the late Dr. Flemuig. 



(To he contim'cd.) 



VOL. III. 



