Hall, James, 1811-1898 / Geological survey of Wisconsin, 1859-1863. Palaeontology. Part third
Plate XV, pp. [unnumbered]-Plate XV PDF (733.8 KB)
PLATE XV-Continued. PLEUROTOMARTA AXION, HALL. Page 394. FIG. 17. View of a specimen of this species taken from a gutta-percha cast. HOLOPBA G UELPHENSIS, BILLINGS. Page 391. FIG. 18. View of a cast which has been referred to this species. MURCHISONIA CONRADI, HALL. Page 396. FIG. 19. View of a specimen of this species taken from a gutta-percha cast. MURCHISONIA LAPHAMI, HALL. Page 396. FIG. 20. The figure is from an impression taken in the natural mould, and shows the characters of the surface and form of the aperture. STRAPAROLLUS mOPSUS, HALL. Page 390. FIGS. 21, 22. Upper and lower sides of a specimen of this species. TREMANOTUS ALPHEUS, HALL. Page 399. FIG. 23. Lateral view of a specimen, showing the umbilicus. 24. Dorsal view, showing the filling of the dorsal perforations, and the radiating strim near the aperture.