PLATE IV. 
Fig. 59. Pterinea newsomensis. Left valve. B, right valve, with concen- 
tric striations on the posterior wing. Newsom, Tennessee. Waldron bed. 
Fig. 60. Pterinea nervata. Left valve with outline restored after comparison 
with Pterinea newsomensis. Between the conspicuous radiating striae there are 
2 to 3 much finer striations, not readily seen except under a lens. Newsom, Ten- 
nessee. Waldron bed. 
Fig. 61. Pterinea brisa. Left valve. Newsom, Tennessee. Waldron bed. 
Fig. 62. Rhombopteria (Newsomella) ulrichi. T, right valve, with cross- 
striations. B, left valve, with only concentric striae, more or less lamellose. New- 
som, Tennessee. Waldron bed. 
Fig. 63. Rhombopteria (Newsomella) revoluta-divaricata. A, right valve, 
with posterior wing restored. B, left side. C, right valve, apparently represent- 
ing a shell shorter in length but greater in height than those figured by A andR. jii 
Newsom, Tennessee. Waldron bed. I 
Fig. 64. Orthostrophia newsomensis. Pedicel valve, with small deep muscular I 
area and strong vascular markings. Newsom, Tennessee. Waldron bed. Glade | 
southwest of Dixon Spring, Tennessee. Brownsport bed. 1 
Fig. 65. Orthostrophia dixoni. Pedicel valve, with small deep muscular area. I 
Glade southwest of Dixon Spring, Tennessee. Brownsport bed. I 
Fig. 66. Rhynchotreta thebesensis. A, Brachial valve. B, Lateral outline r 
of a thin shell. C, Lateral view of a more obese specimen, illuminated from the 
lower right hand side so as to show the flattened sides toward the beak. Beak of ( 
pedicel valve restored. About a mile north of Thebes, Illinois. In the lower part 
of the Silurian, about 3 feet above the Cape Girardeau limestone. 
Fig. 67. Stropheodonta (Brachyprion) newsomensis. Pedicel valve. New- | 
som, Tennessee. Waldron bed. 1 
Fig. 68. Scendium bassleri. T, Brachial valve. B, lateral outline. Newsom, 
Tennessee. Waldson bed. i 
Fig. 69. Lyellia thebesensis. Two specimens. About a mile north of Thebes, j| 
Illinois, 3 feet above the Cape Girardeau limestone. Silurian. j 
Fig. 70. Triplecia (Cliftonia) tenax. A, Brachial valve. By Pedicel valve. 
Clifton, Tennessee. Osgood bed. 
Fig. 71. Hebertella (Schizonema) fasciata. A, Pedicel valve. New Marion, 
Indiana. Osgood bed. ' 
Fig. 72. Rhipidomella newsomensis. A, Brachial valve. B, Lateral view. 
Newsom, Tennessee. Waldron bed. 
Fig. 73. Eucalyptocrinus springeri. Ornamentation too minute to be seen 
readily without a lens. Newsom, Tennessee. Waldron bed. ! 
Fig. 74. Favosites obpyriformis. Part of a globular corallum 6 cm. in width. 
Glade 2 miles west of Vice store, Tennessee. Brownsport bed. 
