PLATE VII a— Continued. 
Figs. 37, 
Fig. 40. 
Fig. 41. 
Fig. 42. 
Fig. 43. 
Fig. 44. 
Fig. 45. 
Fig. 46. 
Fig. 47. 
Fig. 48. 
Fig. 49. 
Fig. 50. 
Fig. 51. 
Fig. 52. 
Fig. 53. 
Fig. 54. 
SCENIDIUM HaLLI, Saffoid, VARIETY. 
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. 
SCENIDIUM PYRAMIDALE, Hall. 
(See Plate VII, figs. 29, 30.) 
A view of the pedicle-valve ; showing its elevation and the character of the surface plications. X 5. 
A cardinal view of the same specimen ; showing the concave delthyrial plate or spondylium. X 5. 
A brachial valve of the same specimen. X 5. 
Niagara group. Lockpoi't, N. Y. 
SCENIDIUM AREOLA, Quenstedt. 
A longitudinal 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 de Waldheim. 
Page 2H. 
Enteletes hemiplicata, Hall. 
An exterior view of a young individual in which the radial plications are'rudimentary. 
A similar view of a small example which bears 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, Missoun. 
A similar view of a mature individual; showing the usual character of the surface. 
Upper Coal Measures. Wintei'set, Iowa. 
A cardinal view of an individual; showing the area and delthyrium of the pedicle-valve and the 
relative convexity of the two valves. 
A profile of a very gibbous old individual. 
Upper Coal Measures. Kansas City, Missouri. 
A profile of the rostral portion of a pedicle-valve ; showing the great elevation of the median and 
lateral septa, the edges of which are more or less broken. X 3. 
A front view of the same specimen; showing the position of the septa, of which the two outer 
ones limit the area of muscular insertion. X 3. 
The interior of the rostral portion of two valves in articulation. The median septum of the upper 
or pedicle-valve is broken 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. 
A profile of the same specimen ; showing the articulation of the valves and elevation of the crura. 
X 2. 
Upper Coal Measures. Winterset, Iowa. 
Enteletes Lamarcki, Fischer cle Waldheim. 
A cardinal view of an individual; showing the area and delthyrium of the pedicle-valve. 
An enlargement of the fine striae of the surface, which are shown to be tubular, as in Rhipidomella 
and Schizophoria. 
Upper Carboniferous limestone. Mjatschkowa, Russia. 
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. 
