BRACHIOPODA. 



227 



Distr. 2 sp. E. psittacea, Labrador (low water?) Hudson's Bay, 100 

 fms. : Melville Id. Sitka ; Icy Sea. R. nigricans, New Zealand, 19 fms. 



Fossil, 250 sp. L. Silurian . N, and S. America, Europe, Thibet, 

 China. 



Sub-genera, ? Porambonites, Pander. P. sequirostris, Schl. Shell im- 

 punctate ; surface minutely pitted ; each valve with a minute hinge-area and 

 indications. of two septa; foramen angular, usually concealed. Distr. 4 sp. 

 L. Silurian. Russia, Portugal. 



Camarophoria, King. T. Schlotheimi, Buch. Tigs. 141, 142. Ventral 

 valve with converging dental plates (d) supported on a low septal ridge (s) ; 

 dorsal valve with a prominent septum (s) supporting a spoon-shaped central 

 process (v) ; oral lamellae long and slender (o). Foramen angular, cardinal 

 process distinct (f). Fossil., 9 sp. ? Garb. Permian (Magnesian limestone). 

 Germany; England. ' t 



Fig. 141. Internal cast.* 



Fig. 142. Section. 



PENTAMERUS, Sowerby. 



Etym. Pentameres, 5 -partite. 



Syn. Gypidia (conchydium) Dalman. 



Type, P. Knightii, PI. XV. fig. 22. Fig. 143. 



Shell impunctate, ovate, ventricose, with a large incurved beak ; valves 

 usually plaited; foramen angular ; no area or deltidium; dental plates (d) 

 converging, trough-like, supported on a prominent septum (s) ; dorsal valve 

 with two contiguous longitudinal septa (s s) opposed to the plates of the other 

 valve. 



Oral lamellse have been detected by Mr. Salter in P. liratus ; in P. ? Ire- 

 virostris (Devonian, Newton) the dorsal valve has a long trough-like process 

 supported by a single low septum. 



Fossil, 20 sp. Arctic America, U. S. Europe. 



*. Ventral side of cast, showing the V shaped cavity of the dental plates, and the 

 impressions of branchial veins, accompanied by arteries; (after King.) 



