128 GEOLOGY. 
Like many other fossils common to both sides of the Atlantic, this species has a lower range 
in the Old World than in America. 
De Konninck reports it as occurring in the Mountain limestone in many parts of Europe, and 
in the Devonian rocks of the Eifel and Wales. I have never known it to be found in strata 
older than the Carboniferous in this country, and it generally occurs in the Coal measures. 
The surface markings of this shell are so delicate that they are frequently not observable; 
and imperfectly preserved specimens, having the general form and appearance of Terebratula 
Royssti, are Seats to be mistaken for that fossil. 
CHONETES. Fisher. 
CHONETES VERNEVILIANA. Norwood & Pratten. Jour. Acad. Nat. Sci., Phil. ; new series, 
vol. III, part 1, page 26. 
Plate II, fig. 6. 
Some portions of the cherty limestone on the banks of the Colorado, one hundred miles 
northwest of the San Francisco mountain, are charged with specimens of a Chonetes which 
approaches more nearly to C. Vernewiliana than to any other described species. 
The figure and description of C. Verneuiliana given by Norwood & Pratten represent it as 
‘*small, transverse, having its greatest breadth on the cardinal border; beak much larger and 
higher than in any other known American species. An extremely deep sinus extends from 
the beak to the anterior border, which is emarginated by it as seen from above. This sinus 
is bordered by high ridges, between which and the ears another sinus occurs. Cardinal border 
furnished with four tubes on each side of the beak,’’ &c. 
From this description the specimens found on the banks of the Colorado in some respects 
depart; the outline of the shell being more oblong; 4. e., the breadth near the anterior border 
approaching that of the cardinal edge; the mesial sinus being less deep, sometimes scarcely 
perceptible, and, in the same degree, the carinations bordering it being less conspicuous; the 
lateral sinuses not generally visible; the tubes of the cardinal border varying from three to 
five on each side of the beak, but usually four; the beak scarcely projecting beyond the 
cardinal border, &c. 
In other respects no differences are perceptible, and I have supposed this to be a form of 
the above species. 
Specimens precisely agreeing with mine were collected by Messrs. Meck and Hayden, at 
Manhattan, in Kansas, in the upper Coal measures. 
RHYNCONELLA. Fisher. 
RHYNCONELLA UTA. 
Terebratula uta. Marcou. Geol. N. Amer., p. 51, pl. VI, figs. 12-12e. 
Common in the middle and upper limestones near the mouth of the Little Colorado; also in 
the limestones of the Coal measures of Kansas and Missouri. 
The specimens on which the description of this species was founded were obtained in Utah, 
near Salt Lake City. 
PECTEN. Linn. 
_ PECTEN OCCIDENTALIS. Shumard. 
- > obtained an imperfect specimen of this species from coal shale on the banks of the 
“Strang " 2 Shove Easton, Kansas. 
‘= 
