AO AX gn, O We SS, 
IN WHICH AN ATTEMPT IS MADE TO DEFINE MORE CLOSELY THE GENERA AND SPECIES OF 
REPTILES WHOSE REMAINS ARE DESCRIBED IN THE PRECEDING PAGES. 
SAURIA, 
THORACOSAURUS. Leidy. 
1. Thoracosaurus neocesariensis. 
New Jersey Gavial. Dr Kay: An. Lye. Nat. Hist. N. Y. 1833, III, 156, Pl. ITI, Fig. 7-10. 
Gavialis neocesariensis. Dx Kay: Zool. New York, 1842, III, 28, Pl. 22, Fig. 59. 
Crocodilus s. Gavialis clavirostris. Morton: Pr. Ac. Nat. Sci. Phil. 1844, III, 82. 
Crocodilus basifissus. Owen: Jour. Geol. Soc. Lond. 1849, V, 381, Pl. X, Figs. 1, 2. 
Sphenosaurus. Aaassiz: Pr. Ac. Nat. Se. Phil. 1849, IV, 169. 
Thoracosaurus grandis. Lxrtpy: Pr. Ac. Nat. Se. Phil. 1852, VI, 35. 
Pages 5-12, Plate I, Figures 1-6; Plate II, Figures 1-3; Plate III, Figures 5-11 
BOTTOSAURUS. Agassiz. 
2. Bottosaurus Harlani. 
Extinct species of Crocodile. Hartan: Jour. ‘Ac. Nat. Sci. Phil. 1824, IV, 15, Pl. I. 
Crocodilus Harlani. Meyer: Paleologica, 1832, 108. 
Crocodilus macrorhynchus. Haruan: Med. and Phys. Res. 1835, 369. 
Bottosaurus. Agassiz: Pr. Ac. Nat. Sci. Phil. 1849, IV, 169. 
Crocodilus basitruncatus. Own: Jour. Geol. Soc. Lond. 1849, V, 380. 
Pages 12-14, Pl. IV, Figs. 19-21; Pl. XVII, Figs. 11-14. 
CROCODILUS. 
3. Crocodilus tenebrosus. 
Page 14: Two cervical, a dorsal, the sacral, and two caudal vertebra, and portions of both humeri, 
from Big Timber Creek, Gloucester Co., N. J. Pl. III, Figs. 12-15. 
4. Crocodilus obscurus. 
Page 15: Four vertebre, the shaft of a femur, and four broken dermal bones, from Barnsboro, @lou- 
cester Co., N. J., Pl. II, Figs. 4, 5. ; 
Page 16, Two posterior dorsal or lumbar vertebrx, from Arneytown, Burlington Co., N. J. 
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