PLATE LXVIIL 
Fig. 
Figs. 
Fig. 
Fig. 
Fig. 
Figs. 
Fig. 
Fig. 
Fig. 
Fig. 
CONOCARDIUM CUNEUS, Var. TRIGONALE. 
Page 410. 
See Plates 67, 94. 
1. The ventral side of a small specimen. 
4-6. Ventral and cardinal views and rig® side of a small specimen retaining the shell. 
Corniferous limestone. Near Louisville, Ky. 
7. An enlargement of the surface from the post-cardinal slope of the preceding. 
8. An enlargement showing a portion of three radii and the extension of the shell beyond the 
umbonal ridg-e, from the specimen fig. 6. 
9. Cardinal view of a specimen showing the surface markings. 
Corniferous limestone. Falls of the Ohio rives'. 
10, 11. Left side and cardinal views of a specimen retaining portions of the test. 
Corniferous limestone. Near Louisville, Ky. 
12. Ventral view of a specimen showing the pedal opening and denticulated margins. 
13. Cardinal view of a cast of the interior, showing anterior and posterior muscular scars. 
Corniferous limestone. Columbus, Ohio. 
14. The right side of a specimen, preserving portions of the test and showing the extent of the 
umbonal expansion of the shell. 
16. Posterior view of the specimen fig. 12. 
CONOCARDIUM OlIIOENSE. 
Pag- 41J. 
Fig. 2. The left side of a specimen. 
Corniferous limestone. Near Louisville, Ky. 
Fig. 3. The left side of a nearly entire individual, enlarged to two diameters. 
Corniferous limestone. Falls of the Ohio rive)'. 
Conocardium normale. 
Page 411. 
Figs. 17, 18. The rig-ht side and cardinal views of a large partial cast of the exterior of a specimen. 
Hamilton group. Cumberland, Md. 
Fig-. 19. The right side of a cast of a smaller specimen, showing the anterior muscular scar and the filling 
of the foot sheath. 
Hamilton group. Cumberland, Md. 
Conocardium Eboraceum. 
Page 412. 
Figs. 20, 21. Ventral and cardinal views of a compressed specimen. 
Hamilton group. York, Livingston Co., N. Y. 
Figs. 22, 23. Ventral view and left side of a small specimen retaining the test and surface ornamentation, 
enlarged to two diameters. 
Hamilton group. York, N. Y. 
