NATURAL SCIENCES OF PHILADELPHIA. 175 



Co., Texas, and were donated to the New York Lyceum of Natural H' story by 

 Mr. Robertson. The fossils are mostly thoroughly permeated with bitumen ; 

 others slightly. 



Eqdus complicatus. 



1. A first superior molar. Length along the inner median column 2i inches ; 

 antero-posterior diameter of the triturating surface 20 lines ; transverse diame- 

 ter, independent of the cementum, 13j^ lines. It nearly resembles the specimen 

 represented in fig. 9, pi. xv, of Holmes' Post Pliocene Fossils of South 

 Carolina. 



2. A last superior molar, curved to a remarkable degree. Length along t^ie 

 inner median column, less the fang, 2 inches 1 line ; antero-posterior diameter 

 of triturating surface independent of cementum 18 lines ; transverse di.ameter 

 do. 10| lines; length of curve antero-externally 35 lines, postero-externally 16 

 lines. 



3. An upper temporary molar. Length internally lOJ lines ; antero-posterior 

 diameter 17 lines; transverse diameter 9h lines. 



4. A fragment of a fourth upper molar. 



5. The upper part of the crown of a last lower molar. Antero-posterior 

 diameter 15^ lines ; transverse diameter, independent of the cementum, 5,^ 

 lines. 



fi. A fifth inferior molar. Length antero-internally to division of fangs 33 

 lines ; antero-posterior diameter 13 lines ; transverse diameter, independent of 

 cementum, 6 lines. 



All the above are completely imbued with bitumen, which has penetrated 

 the cementum and dentine throughout. 



7. Fragments of a lower jaw, with the first molar tooth. This specimen is 

 only partially impregnated with bitumen. The length of the tooth is 33 lines; 

 the antero-posterior diameter 17 lines; the transverse 7 lines. 



Mastodon americanus. M. ohioticus or 31. giganteus of authors. 

 A small fragment of a molar. 



Megalonyx validus, n. s. 



A portion of a tooth resembling most in its form the second upper tooth of 

 the Megalonyx Jeffersoni, but much larger than in the mature individuals of that 

 species. The transverse diameter is 15| lines; the antero-posterior IH lines. 

 The transverse section is quadrate. The anterior surfixce is nearly a ti-ausverse 

 plane ; the posterior surface forms a plane inclining outward ; the inner surface 

 is nearly a plane inclining forward ; the outer surface forms with those in front 

 and behind a semi-circle. The triturating surface is comparatively slightly 

 concave, and inclines postero-internally. Its anterior border is the most pro- 

 minent; the posterior being comparatively so little prominent as not strikingly 

 to interfere with the slope of the surface. The specimen is thoroughly impreg- 

 nated with bitumen. 



Felis (Trucifelis) fatalis, n. s. 



An upper sectorial molar, contained in a small fragment of the jaw, which 

 also includes the socket for a single fanged tubercular tooth. The specimen 

 is thoroughly saturated with bitumen. 



The sectorial tooth indicates a feline animal, approaching in size the lion or 

 Bengal tiger. The form of the tooth is nearly like the corresponding one of 

 the latter animals, but the crown is of less width and proportionately longer. 

 The anterior lobe differs from that in the true cats not only in a greater propor- 

 tionate development, but in its distinct separation in two sub-lobes, of which the 

 anterior is rather more than half the depth of the succeeding one. The 

 measurements of the tooth, in comparison with those in a similar one of a large 

 skull of the Bengal tiger, are as follows : 



1868.] 



