DAVIDSON — ON SCOTTISH CARnONIPEROUS BRACHIOPODA. 
25 
vcxity, as well as in t,hc chai-actcr of their ribs, wliick cither cover the entire 
shell, or become obsolete towards the beaks. When perfect, the valves pos- 
I '■ 1 
Lign. 7. — Camarophoria crnmena. 
Fig. 1. — Interior of the Dorsal Valve. Fig. 2.— Interior of the Ventral Valve. 
A, adductor, or occlusor muscular impressions (?) ; C, curved processes, to' wliich 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- 
Bhaped process, or visceral support ; R, cardinal, or divaricator muscular scars (?) ; S, septum. 
sessed marginal expansions, but wliich are rarely preserved in the fossil. The 
mesial fold differs m width and elevation according to the number of ribs which 
ornament its surface, these varying from two to seven, each valve being fur- 
nished with from twelve to twenty ribs. The sinus is of moderate depth. 
Of this species I am acquainted with but a single well-authenticated example, 
which was iouud many years ago in West Lotliian by the late Dr. Fleming. 
(To be eontinued.J 
VOL. 111. 
D 
