96 INTRODUCTION. 



Genus — Camakophoria, Kinff, 1844. 

 Type—C. ScHLOTHEiMi, F. Buck, sp. Int., PI. VII, figs. 108—113. 



Terebratula (part), of the generality of Authors. 

 Rhynchonella (part), of M. d'Orbigny. 



Animal unknown ; shell of a subtrigonal shape, with convex valves longitudinally 

 divided by a sinus and mesial fold ; beak entire, acute, more or less incurved, under the 

 extremity of which a small fissure is sometimes exposed ; no area or deltidium ; surface 

 generally plaited, with or without marginal expansions ; shell structure impunctate -^ 

 valves articulating by means of teeth and sockets. 



In the perforated valve, the dental plates are conjoined at their dorsal margins, 

 forming a trough-shaped process affixed to a low medio-longitudinal plate. In the 

 smaller valve, the space between the sockets is occupied by a small cardinal muscular 

 protuberance or boss, on either side of which two long slender processes curve upwards, 

 to which were, no doubt, attached the free cirrated spiral fleshy arms ; from beneath the 

 cardinal process, a high vertical mesial septum extends to a little more than a third of the 

 length of the valve, supporting along and close to its upper edge a spatula-shaped process, 

 considerably dilated towards its free extremity, and projecting with a slight upward curve 

 to nearly the centre of the shell. 



Obs. We are greatly indebted to Professor King for the knowledge we possess of this 

 genus.^ Its affinities both to Bhynchonella and Pentamerus are obvious, and its natural 

 place between the two did not escape the scrutiny of the learned Professor, who observed 

 that the form of the trough and supporting plate of the larger or ventral valve in 

 Camarophoria bears a striking resemblance to the same in Pentamerus, but that the 

 apophysary system in the dorsal valve of the last-named genus " consists of two socket- 

 plates largely developed, and passing to a considerable distance into the cavity of the shell. 

 Whereas, in Camarophoria, it appears to consist of a medio-longitudinal plate, equally as 

 much developed and expanded bilaterally at its free or upper margin. That although 

 related to Pentamerus, Camarophoria is also closely allied to Rhynchonella,^ especially in 

 external form ; the only difference is in their internal structure, Mhynchonella having the 

 dental plates completely separated, and divaricating, as in Orthis, and the same amount of 

 dissimihtude prevails between the apophysary system belonging to the small valve of both 



^ Dr. Carpenter's Microscopic Examination of the Shell Structure is different from that published by 

 Professor King, ('Mon. of English Permian Fossils,' p. iv.) 



2 Refer for extended details to Professor King's description of the genus, in the 'Ann. and Mag. of 

 Nat. Hist.,' July, 1846, and to the same authors 'Mon. of Permian Fossils of England,' p. 113, 184!). 



^ The term HAjpothyris is here made use of by Professor King, but as that appellation is considered to 

 be a synonyme of Rhynchonella, I have preferred this last to the name introduced by the Professor. 



