PLATE LXII— Coiitiiiuol 



Genus CAMAROPHORIA, King. 



Page vil-' 



Camakophokia rhomboidalis, sp. nov. 



Fig. 25. Dorsal view of a specimen of somewhat, below the average size. 



Fig. 26. Frontal view of a similar specimen enlarged ; showing the character of the marginal plication 

 and the development of fold and sinus. X 2. 



Figs 27, 28, 29. Dorsal, \-eiitial and front views of an average adult shell, possessing a sharper median fold 

 and sinus, stronger plication, and showing the median .septum in each valve through the sub- 

 stance of the shell./ 



Comiferous limestone. Peru, Indiana. 



Subgenus PUGNAX, s.-gen. nov. 



Page 202. 

 PuGNAX (?) Dawsonianus, DavillsDIl. 



Fig. 30. Dorsal view of a young shell without plication. X 2. 



Figs. 31, 32, 33. Dorsal, protile and front views of a .*hell with mature characters ; showing the marginal 

 plication and the elevation of the beak. X 2. 



Carboniferous limestone. Windsor, Nora iHrotia. 



Genus CAMAROPHORIA. King. 



Page 212. 

 CAMAROPHORIA SUBCUNEATA, Hall. 



Fig. 34. Dorsal view <if a young, but freely plicated shell ; showing the shallow valves, subtriangular out- 

 line, and long cardinal slopes. 



Figs 3S, 36. Protile and front views of a mature and gibbous shell, showing the character of the plication 

 and the bi'oad, concave cardinal slopes. 



Fig. 37. A portion of the interior of the jiedicle-valve, showing the spondylium s\ipported by a median 

 septum. The summits of the teeth have been broken, showing their lateral union with the 

 walls of the shell. X 2. 



St. Louis grou)!. }Vos]i'iii<it(iii count!/. Indiana. 



Camaroi'Ikjhia .•<ubtiug()Na, Mcrk anil W'oiilicii. 



Figs. 38, 39, 40. Cardinal, frontal and ventral views of an internal cast ; showing the contour of the .shell, 

 the denticulate margin of the valves on the broad cardinal slopes, the sharply serrate anterior 

 and lateral mai'gins and the cavity left by the spondylium and median septiun of the 

 pedicle- valve. 



Chert of the Burlington limestone. Burlington, loica. 

 Figs. 41, 43. Internal casts of pedicle-valves, showing the form of the muscular imjiression. 



Keokuk group. Nauvoo, Illinois. 

 Fig. 42. The umbonal portion of an internal cast of both valves, enlarged, the pedicle-\alve being above. 

 This figure shows the cavity of the spondylium, median septum and oblique dental plates of 

 the pedicle-valve ; median septum and small umbonal spondylium of the brachial valve. X 3. 

 Chert of the Burlington limestone. Pike county, Missouri. 



Subgp:nus PUGNAX, s.-gen. nov. 



•Piige 202. 

 PuGNAX MiSSOURIENSIS, SwillloW. 



Figs. 44, 45. Cardinal and protile views of an internal cast of a lai'ge specimen ; showing the contour of the 

 shell, the cavities of the median septum of the bi'achial valve, the dental plates and the fore- 

 shortened outline of the mu.sculai- area in the pedicle-valve. 



Yellow standstones of the Burlington group. Burltnytvn, Iowa. 



