I'LATE VII A— Coutinueil. 



ScENiDiuM Halm, .Sartbrd, variety. 



Figs. 37, 38, 39. Three views of a specimen ; showing- the great length of the hinge, the relatively low and 

 narrow cardinal areas and the somewhat coarser plications of the surface. X 6. 

 Trenton horizon. Cannon Falls, Minnesota. 



SCENiniUM PVRAMIDALE, Hall. 



(See Plate VII, Hgs. 29, 30.) 

 Fig. 40. A view of the pedicle-valve ; showing its elevation and the character of the surface plications. X 5. 

 Fig. 41. A cardinal view of the same specimen ; showing the concave delthyrial plate or spondylium. X 5- 

 Fig. i'l. A brachial valve of the same specimen. X 5. 

 Niagara gi-oup. Lockport. N. Y. 



SCENIDIUM AREOLA, Queustfdt. 



Fig. 43. A longituciinal section of the two valves ; showing the extension of the median plate into the cavity 

 of the pedicle-valve. (After Davidson.) 

 See for further information, Zeitschr. der deutsch. geolog. Gesellsch., vol. xxiii, plate viii ; and 

 Davidson, Devonian Brachiopoda, Suppl., plate iii, figs. 11-14. 



Genus ENTELETES, Fisher vk Waldheim. 



Fage -214. 



Enteletes hemiplicata, Hall. 



Fig. 44. An exterior view of a young individual in which the radial plications ai-e rudimentary. 



Fig. 45. A similar view of a small example which hears a plication in the median sinus of the pedicle- 

 valve, with a corresponding furrow on the fold of the opposite valve. 

 Upper Coal Measures. Kansas City, Missouri. 



Fig. 46. A similar view of a mature individual ; showing the usual character of the surface. 

 Upper Coal Measures. Il'iJito'.set, Iowa. 



Fig. 47. A cai-dinal view of an individual ; showing the area and delthyrium of the pedicle-valve and the 

 relative convexity of the two valves. 



Fig. 48. A profile of a very gil)bous old individual. 



Upper Coal Measures. Kansas City, Missouri. 



Fig. 49. A profile of the rostral portion of a pedicle-valve ; showing the great elevation of the median and 

 lateral septa, the edges of which ai-e more or less broken. X 3. 



Fig. 50. A front view of the same specimen ; showing the position of the septa, of which the two outer 

 ones limit the area of muscular ip.sertion. X 3. 



Fig. 51. The interior of the rosti-al jiortiin of two valves in articulation. The median septum of the upper 

 or pedicle-valve is iiroken off, but the lateral septa are retained. In the brachial valve are seen 

 the high crural plates which are produced into strongly recurved crura. At (j) is the small, 

 lobate cardinal process, and in the bottom of the valve a low median ridge. X 2. 



Fig. 52. A profile of the same specimen ; showing the articulation of the valves ami elevation of the crura. 

 X 2. 



Upper Coal Measui-es. Winterset. Iowa. 



Enteletes Lamarcki, Fischer tie Waldheim. 



Fig. 53. A cardinal \-iew of an individual ; showing the area and delthyrium of the pedicle-valve. 

 Fig. 54. An enlargement of the fine strife of the surface, which are shown to be tubular, as in Rhipidomella 

 and ScHizopHORiA. 



Upper Carbonifei'ous limestone. Mjafschlioioa. Rtui.fia. 

 For further illustration of this genus, see Waagen. Salt-Range Fossils, vol. i, pt. 4 ; also. Meek, 

 U. S. Geological Survey, Final Report on Nebraska, pp. 177, 178, plates vi and viii. 



