|
Geological Survey Professional Paper 58
The Guadalupian Fauna |
PLATES — PLATE X.
CAPITAN FORMATION, GUADALUPE MOUNTAINS.
|
ORTHOTETES GUADALUPENSIS n. sp. (p. 199). | |
| FIGS. 1 to 1d. |
The type specimen retaining both valves in conjunction. All the figures X 1-1/2. It was not found possible to represent quite faithfully the fineness of the lirae and their rounded shape. |
| 1. |
Ventral view. |
| 1a. |
Dorsal view. |
| 1b. |
Anterior view. |
| 1c. |
Posterior view. |
| 1d. |
Side view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 2 to 2b. |
A similar but somewhat irregular specimen retaining both valves. All the figures X 1-1/2. |
| 2. |
Side view. |
| 2a. |
Posterior view. |
| 2b. |
Dorsal view. Capitan formation, Capitan Peak (station 2926). |
| FIG. 3. |
A dorsal valve from which the shell has been largely exfoliated, so that the socket plates can be seen. Seen from above, X 1-1/2. Capitan formation, Capitan Peak (station 2926). |
| FIG. 4. |
A ventral valve with the apex ground down to show the septal arrangement, X 3. The typical camerate structure is seen, but as the specimen was somewhat distorted the septum is not quite central. Capitan formation, Capitan Peak (station 2926). |
| FIG. 5. |
Fragment of a ventral valve which has been broken along the dental plates and septum. x, Pseudodeltidium; y, y, converging dental plates; z, median septum. Specimen viewed obliquely downward and to the right, X 3. Capitan formation, Capitan Peak (station 2926). |
|
ORTHOTETES DECLIVIS n. sp. (p. 200). | |
| FIGS. 6 to 6b. |
A ventral valve taken as the type of the species. The figures of this species are not enlarged, so that its size relative to the preceding type is misrepresented. |
| 6. |
Seen from above. |
| 6a. |
Posterior view. |
| 6b. |
Side view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 7 and 7a. |
A fragmentary dorsal valve supposed to belong to this species, with the shell partially removed to show the long socket plates. |
| 7. |
Seen from above. |
| 7a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 8 and 8a. |
A somewhat imperfect dorsal valve referred to this species. |
| 8. |
Seen from above. |
| 8a. |
Side view in outline. Capitan formation, bill southwest of Guadalupe Point (station 2906). |
|
ORTHOTETES DISTORTUS n. sp. (p. 201). | |
| FIGS. 9 to 9c. |
The type specimen preserving both valves in conjunction. The extremely fine liration can not be accurately represented on figures of this size. All figures nearly X 2. |
| 9. |
Posterior view. |
| 9a. |
Side view. |
| 9b. |
Anterior view. |
| 9c. |
Dorsal view. Capitan formation, Capitan Peak (station 2926). |
|
ORTHOTETES DISTORTUS var. CAMPANULATUS n. var. (p. 202). | |
| FIGS. 10 to 10c. |
A ventral valve; the typical specimen. All figures X 1-1/2. |
| 10. |
Anterior view, showing the great length of the septum. |
| 10a. |
Side view. |
| 10b. |
Seen from above. |
| 10c. |
Posterior view. Capitan formation, Capitan Peak (station 2926). |
|
DERBYA sp. a (p. 184). | |
| FIGS. 11 and 11a. |
A ventral valve provisionally referred to this species. The shell has been much exfoliated, partially obscuring the sculpture. |
| 11. |
Seen from above. |
| 11a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
|
DERBYA sp. b (p. 185). | |
| FIG. 12. |
A fragmentary ventral valve. Posterior view. Capitan formation, Capitan Peak (station 2966). |
 |
| Plate X. (click on image for a PDF version) |
| <<< Previous | <<< Contents >>> | Next >>> |
pp/58/plate10.htm
Last Updated: 05-Dec-2008