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Geological Survey Professional Paper 58
The Guadalupian Fauna |
PLATES — PLATE XI.
CAPITAN FORMATION, GUADALUPE MOUNTAINS.
|
DERBYA sp. a (p. 184). | |
| FIG. 1. |
A large dorsal valve considerably exfoliated and broken around the edges. Seen from above. The cardinal process, owing to its direction, is considerably foreshortened in this view. Capitan formation, Capitan Peak (station 2926). |
|
GEYERELLA AMERICANA n. sp. (p. 204). | |
| FIGS. 2 to 2b. |
An imperfect ventral valve which has lost part of the left side, the fracture passing along the dental plate and septum. |
| 2. |
Anterior view. |
| 2a. |
Posterior view. |
| 2b. |
Side view, in which the dental plate and septum arc exposed by the fracture. Capitan formation, Capitan Peak (station 2926). |
|
STREPTORHYNCHUS GREGARIUM n. sp. (p. 177). | |
| FIGS. 3 and 3a. |
An imperfect specimen retaining both valves in position. |
| 3. |
Side view. |
| 3a. |
Posterior view, X 2. Owing to the fracture there can here be seen the dental callosities, without real dental plates or septum. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 4 to 4c. |
An imperfect specimen with both valves |
| 4. |
Posterior view, somewhat tilted backward. |
| 4a. |
Anterior view, somewhat tilted forward. |
| 4b. |
True front view in outline. |
| 4c. |
Side view, in outline. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 5 to 5b. |
A specimen having a low altitude and regular growth. |
| 5. |
Anterior view in outline. |
| 5a. |
Side view. |
| 6b. |
Dorsal view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 6 to 6b. |
A small distorted ventral valve. |
| 6. |
Side view. |
| 6a. |
Front view. |
| 6b. |
Front view, X 2. Capitan formation, Capitan Peak (station 2926). |
| FIG. 7. |
An elongate specimen of irregular growth. Side view. Capitan formation, Capitan Peak (station 2926). |
|
CHONETES HILLANUS n. sp. (p. 228). | |
| FIGS. 8 to 8b. |
A rather large ventral valve. |
| 8. |
Seen from above. |
| 8a. |
Posterior view. |
| 8b. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
| FIG. 9. |
A somewhat smaller ventral valve. Seen from above. Capitan formation, Capitan Peak (station 2926). |
| FIG. 10. |
A cast taken from an imperfect natural mold of a dorsal valve. Seen from above. Capitan formation, Capitan Peak (station 2926). |
|
PRODUCTUS LATIDORSATUS n. sp. (p. 264). | |
| FIGS. 11 and 11a. |
A slightly imperfect ventral valve. |
| 11. |
Side view. |
| 11a. |
Anterior view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 12 to 12b. |
A ventral valve of the usual size and configuration. Some examples show finer and more distinct ribs. |
| 12. |
Posterior view. |
| 12a. |
Seen from above. |
| 12b. |
Side view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 13 to 13b. |
A dorsal valve showing for the most part the inside of the shell. This specimen is marked by rather fine, obscure costae. |
| 13. |
Anterior view. |
| 13a. |
Seen from above. |
| 13b. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
 |
| Plate XI. (click on image for a PDF version) |
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Last Updated: 05-Dec-2008