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560
CLINTON R. STAUFFER
Horizon and locality.—Amherstburg dolomite, Stony Island Dry Cut, Livingston Channel, Detroit River, near Trenton, Michigan.
DESCRIPTION OF PLATES
All figures are natural size.
Mr. G. S. Barkentin, delineator.
| PLATE I | ||
| Fig. | 1. | Arachnocrinus ignotus n.sp. |
| 1. | Dorsal (?) view. | |
| Figs. | 2-5. | Poterioceras canadensis n.sp. |
| 2. | Ventral view. | |
| 3. | Dorsal view. | |
| 4. | Lateral view. | |
| 5. | Posterior view of the last chamber preserved and showing position of siphuncle. | |
| PLATE II | ||
| Figs. | 1-2. | Rhipidomella intermedia n.sp. |
| 1. | Brachial valve. | |
| 2. | Pedicle valve of same specimen. | |
| Fig. | 3. | Schizophoria prima n.sp. |
| 3. | Pedicle valve. | |
| Figs. | 4-5. | Stropheodonta delicatula n.sp. |
| 4. | Impression of brachial valve showing impression of part of cardinal area of pedicle valve. | |
| 5. | Impression of brachial valve of another specimen. | |
| Fig. | 6. | Nucleospira livingstonensis n.sp. |
| 6. | Pedicle valve. | |
| Figs. | 7-8. | Loxonema inculta n.sp. |
| 7. | A small specimen showing surface markings fairly well preserved. | |
| 8. | A large specimen showing surface poorly. | |
| PLATE III | ||
| Figs. | 1-2. | Callonema perlata n.sp. |
| 1. | Lateral view showing character of surface markings. | |
| 2. | Apical view. | |
