GENUS CAMAROPHORIA. ' 367 



GEXrS CAMAROPHORIA (King, 1844). 



The Genus Camarophoria is described as having the shells of subtrigo- 

 nal form, 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 expan- 

 ' sions : shell structure impunctate ; valves a^-ticulating 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-longi- 

 ' tudinal 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 closQ 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." 



The typical form, C. schlotheimi (Von Bcch sp.), has the same form and 

 expression of a strongly plicated Rhynchonella, and diffiers mainly in 

 the trough-shaped process formed by the union of the dental lamellae. 

 Authentic examples are known in Europe from the Carboniferous and 

 Permian systems, and Mr. Davidson expresses a belief that it will be 

 found in the Devonian. Unfortunately I have had no opportunity of 

 seeing more than a single American species which could be satisfactorily' 

 referred to this genus, ^nd that one has a plicated surface and rhyncho- 

 nelloid form. It is with much hesitation, therefore, that I refer the fol- 

 lowing smooth shell of Devonian age to this genus. 



In making a final examination of the obscure and doubtful mate- 

 rial of the Corniferous limestone, containing Meristella, Terebratula, 



