CHAPTER IX. 
DESCRIPTIONS AND NOTICES OF THE FOSSILS COLLECTED UPON THE 
| ROUTE 
BY PROFESSOR JAMES HALL. 
The fossils of this collection were submitted to me by Mr. W. P. Blake, in July, 1855. 
They consist of cretaceous and carboniferous species, most of them previously described and 
well known. A considerable number of specimens were not sufficiently perfect to be identified 
and described in detail, though they were clearly of the age of the formations designated 
above. At the time of my examination, two of the carboniferous species were undescribed ; 
since then, however, one of them has been described by Dr. Shumard, in the Geological Report 
of the State of Missouri. | | | 
The following list embraces those which have been recognized, with the single new species. 
LIST OF FOSSILS DESCRIBED AND FIGURED. 
GnayPuxA Prrcmerr. Plate I, figures 1-6. 
GRYPHAA PITCHERI, var. NAVIA. Plate I, figures 7-10. 
OSTREA CONGESTA, Plate I, figure 11. 
TEREBRATULA MILLEPUNCTATA. Plate II, figures 1 and 2. 
—TEREBRATULA suBTILITUS. Plate II, figures 3, 4, and 5. 
SPIRIFER LINEATUS. Plate II, figures 6, 7, and 8. 
SPIRIFER KENTUCKENSIS. Plate II, figures 10 and 11. 
SPIRIFER CAMERATUS. Plate II, figures 9, 12, and 13. 
Propuctus Rocersr. Plate II, figures 14 and 15. 
PRODUCTUS SEMIRETICULATUS. Plate II, figures 16 and 17. 
CRETACEOUS SPECIES. 
GRYPHÆA, Lamarck. GRYPHÆA PITCHERI.—Plate I, figs. 1-6. 
Grypuma Prrcuert, Morton, Synopsis of the Organic Remains of the Cretaceous Group of the 
United States, 1834, page 55, plate XV, fig. 9. 
GRYPHÆA Tucumcari, Marcou, Resumé of a Geological Reconnoissance, de. 
GRYPHJEA DILATATA, var. Tucumcari, Marcou, Bulletin de la Soc. Geol. de France. Tome XII, 
Mai, 1855, plate XXI, figs. 1, 2, 3. 
Shell subovate, more or less thickened, expanded, distinctly lobed ; lower valve very convex, 
gibbous in the middle; beak more or less strongly incurved; umbo large and prominent; upper 
valve thick, subconvex anteriorly, concave in the middle; postero-ventral margin sinuate and 
elevated in a line corresponding to the depression in the opposite valve; surface strongly lamel- 
. lose, with sometimes a few impressed radiating lines near the centre. 
This shell presents much variation in specimens from different localities, and even in those 
from the same locality. In well marked specimens the larger valve is very distinctly lobed by 
a broad, undefined depression, extending from the posterior side of the back to the postero- 
ventral margin. It is sometimes simply convex, often gibbous and extremely arcuate, with the 
beak strongly incurved. In the simply convex specimens, the inner side of the beak often pre- 
sents but a slight incurvation, while the exterior is still strongly arcuate. The surface exhibits, 
more or less distinctly, an imbricate-lamellose structure. The upper valve is often abruptly 
elevated in front, flat or concave in the middle, with the surface strongly imbricate-lamellose, 
