Hall, James, 1811-1898 / Geological survey of Wisconsin, 1859-1863. Palaeontology. Part third
Plate XIII, pp. [unnumbered]-Plate XIII PDF (735.8 KB)
PLATE XIII. OBOLUS CONRADI, HALL. Page 375. FIG. 1. View of the cast of the dorsal valve, showing the longitudinal septum and the filling of the cavities beneath the margins of the transverse plate. a 2. Cast of a ventral valve, showing the impression of the transverse plate, the median depression of the hinge plate, and the cavities left by the teeth-like processes. STROPHODONTA PROFUNDA, HALL. Page 376. FlIG. 3. Impression of the surface of the concave valve of a small individual, with a portion of the filling of the cavity between the valves, showing the impression of the ventral valve on the margin. 4. Impression of the interior of the ventral valve of a large individual. The muscular imprints in the figure are not represented so long as they are in the original specimen. ASPIRIFERA EUDORA, HALL. Page 377. FIG. 5. Dorsal view of a specimen of this species. ' 7. Profile of the same specimen, showing the gibbosity of the valves, and the height and curvature of the area. - SPIRIFERA GIBBOSA, HALL. Page-378 FIG. 6. View of a dorsal valve of this species. " 8. Cardinal view of a specimen. SPIRIFERA PLICATELLA, VAR. RADIATA, SOWERBEY. Page 378. FIG. 9. Dorsal view of a small individual, showing the extension of the lamellse in the dorsal valve as seen in young specimens. " 10. Ventral view of the same individual, showing the extent of the lamell~e in the ventral valve. " 11. Profile of the specimen. SPIRIFERA MFTA, HALL. Page 380. FIG. 12. Ventral view of a specimen. 13. Cardinal view of the same individual, showing the height and extent of the straight area. SPIR!FERA NOBILIS, HALL. Page 380. FIG. 14. Dorsal view of an individual of medium size. 15. Ventral view of a specimen, showing plications in the mesial sinus. " 16. Ventral view of a large individual. " 17. Cardinal view of the specimen fig. 16.