108 THE STRUCTURE OF THE FEET OF MEGALONYX. 
Besides the bones mentioned, the collection of Prof. Tuomey contains an atlas, axis, 
and three other cervical vertebree; fragments of ribs and dorsal and lumbar vertebrae; six 
caudal vertebre; one calcaneum, one astragalus, one cuneiform, and two cuboid bones; a 
first and second median phalanx of the hind foot, co-ossified as described in the memoir 
above mentioned, and a first median phalanx isolated; a first and second phalanx of the 
fourth toe; two median mecatarpals, one fifth metacarpal, and the first and second pha- 
langes of the median and fourth toes of the fore foot. 
Mingled with these remains of the Megalonyx, there was a humerus of a large wolf, 
and the same bone of a species of deer. 
REFERENCE TO PLATE 6. 
Fig. 1. The second to the fifth metatarsal bone inclusive of the right hind foot of Me- 
galonyx Jefferson, commencing from the right d, b,c, a. One half the size of nature. 
- REFERENCE TO PLATES IV, V, VI. j 
Plate IV. Fig. 1. Skull of Zrichecus rosmarus fossilis, from the coast of New Jersey; reduced one half. Fig. 
2. Under view of a facial fragment of the skull of Vrichecus rosmarus fossilis, also found on the coast of New 
Jersey; reduced one half. 
Plate V. Fig. 1. Under view of the same specimen represented in plate IV, figure 1; reduced one half. 
Fig. 2. Tooth of Cochlicdus nitidus; natural size. Figs. 3—16. Teeth of Cochliodus occidentalis. Fig. 17. 
Tooth of Cochliodus latus. 
Fig. 18. Tooth of Helodus gibbus. 
Fig. 19. Tooth of Chomatodus venustus, upper view; enlarged three diameters. Fig. 20. Profile section of the 
tooth at the middle; three diameters. Fig. 21. Profile section at one side; three diameters. Fig. 22. Tooth of 
Chomatodus obscurus; natural size.’ Fig. 23. Profile section of the same tooth. 
Figs. 24 and 25. Posterior and anterior view of the portion of a tooth of Palaeobatis insignis; enlarged two 
diameters. Fig. 26. Profile section of the same tooth; enlarged four diameters. 
Figs. 27 and 28. Internal and external view of the tooth of Ctenoptychius digitatus; natural size. Fig. 29. 
Profile section of the same tooth. 
Fig. 30. A flat pointed bone (?), found in company with the preceding teeth; in the carboniferous limestone of 
illinois. 
Plate VI. Fig. 1, d, ¢, b, a. The second to the fifth metatarsals, of the right hind foot of Megalonyx Jeffer- 
sonii; reduced one half. B 
Figs. 2, 3. Superior and inferior molar teeth of the right side, of Dicotyles compressus. Figs. 4 and 5, supe- 
rior first and second incisors. Figs. 6 and 7, inferior first and second incisors. 
Tig. 8. Left upper maxillary bone of Saurocephalus lanciformis. Fig. 9. Tooth of do.; magnified three dia- 
meters. Figs. 10, 11. Transverse sectional outlines of the crown and fang; three diameters. Fig. 12. Left max_ 
illary (a,) and premaxillary (b,) of S. Leanus. Fig. 13. Inner view of the same specimen. Fig. 14. Left dental 
bone of S. Leanus. Fig. 15, Outline of a superior tooth of do.; magnified four diameters. 
