216 Miscellanies. 
9. Large Trilobite ; Iowa Coralline Marble.—Lieut. Daniel Ruggles, 
now stationed at Fort Wilkins, Lake Superior, discovered in 1841 at 
Fort Atkinson, fifty miles west of Prairie du Chien, in a blue fossiliferous 
limestone, several specimens of a gigantic trilobite, some of which indi- 
cated that the original was thirty inches long. The same gentleman in 
1840 expressed the opinion that the beautiful stellated marble of Iowa 
was from a true fossilized coralline formation.—(Extract of a letter to 
the Senior Editor, dated Fort Wilkins, Feb. 17, 1845.) : 
The Iowa marble is often seen in the heads of walking canes and in 
other ornamental forms, and is one of the most elegant things of the 
family to which it belongs. Ep. 
10. Dorudon.—Prof. Rozert W. Gizzes, M. D., of Columbia, South 
Carolina, has communicated to the Academy of Natural Sciences, a 
description of the teeth of a new fossil animal found in the green sand 
of South Carolina. The name Dorudon, or spear-shaped tooth, refers 
to a form supposed to be intermediate between a Cetacean and a Sau- 
rian, and to indicate that the Dorudon is ‘a connecting link between 
these two great classes.” 
11. Footprints ; by A. T. Kine, M. D.—The accompanying wood 
cut, from a drawing by Dr. King, represents part of a slab of limestone 
containing some of the tracks in series, which were described in the 
last number of this Journal. Dr. K. states that the hind foot, in both 
the S. pachydactylum, (fig. 1,) and S. leptodactylum, (2,) is a little 
larger than the fore foot.* 
Dr. K., in a letter to the Editors, describes other impressions which 
have a very remarkable character; but until further investigated it 
would be unsafe to consider them footprints. There are eight of these 
impressions of similar size and shape, forming a continuous series in a 
bent line ; each is of an ovoidal form, 13 inches long, 9 broad, and 8 to 
6 deep, and the interval between is 3 feet 6 inches. The impression 
before is deep and ovoidal in the bottom, but behind it is quite shallow 
or superficial. They occur in slabs of a hard, coarse-grained sandstone, 
found on the first anticlinal ridge west of Chesnut Ridge, one of the 
principal ridges of the Alleghany range. 
Dr. King proposes to call the hand-shaped tracks, supposed to be 
Batrachian, (see last number, pp. 348—351,) Thenaropus heterodac- 
tylus. ‘The generic name is from Osvag, palm of the hand, and zovs, foot. 
* References to the diagram.—1, 8. pachydactylum. 2, S. leptodactylum. 3, 8. 
therodactylum. 4, O. Culbertsonii. 
