118 SAURIA. 
HOLCODUS.  Gibbes. 
12. ? Holcodus acutidens. 
Mosasaurus minor. 
308 
Holcodus acutidens. 
Gippes: Mem. on Mosas., Smiths. Cont. 1851, II, 7, Pl. I, Figs. 
In part, of Grppes: Ibidem 9, PI. III, Figs. 6-9. 
Pages 38, 40, 41, 42, 45, 72, Vertebree, basi-occipital bone, tympanic bone, humerus, radius, and 
pterygoid bone with teeth, from Mississippi. PI. VII, Figs. 4-7; Pl. VIII, Figs. 1, 2,7; Pl. XI, Fig. 14. 
Page 77, Tooth, No. 88. Pl. X, Fig. 17. 
BASEODON. Leidy. 
13. Baseodon reversus. 
Pages 30, 31, Teeth, No. 30. Pl. X, Figs. 14,.15. 
Mosasauroid Remains of Uncertain Reference. 
a. Amphorosteus Brumbyi. Gippes: Mem. on Mosas., Smiths. Cont. 1851, II, 10, PL 
III, Figs. 10-14. 
b. Page 45, Two bones of extremities. Pl. VIII, Figs. 9, 10. 
MACROSAURUS. Owen. 
14. Macrosaurus levis. 
Macrosaurus levis. Owrn: Jour. Geol. Soc. Lond. 1849, V, 380, PI. 
Macrosaurus. Emmons: Rep. North Car. Geol. Surv. 1858, 213, Fig. 34 a. 
Pages 74, 75. Pl. III, Figs. 1, 2; Pl. VII, Figs. 19, 20. 
POLYGONODON. Leidy. 
15. Polygonodon vetus. 
Polygonodon vetus. Lxrtpy: Proc. Ac. Nat. Se. Phil. 1856, VIII, 221. 
Polygonodon rectus. Emmons: Rep. N. Car. Geol. Sury. 1858, 218, Fig. 37, A; Manual 
of Geology, 1860, 208, Fig. 3. ; 
Mossosaurus rectus. EEMMons: Ibidem 218. 
Page 76, A tooth, from Burlington Co., N. J. Pl. IX, Figs. 12, 13. 
HADROSAURUS. Leidy. 
16. Hadrosaurus Foulkii. 
Hadrosaurus Foulkii. Lertpy: Proc. Ac. Nat. Se. Phil, 1858, 218. 
Pages 76-97. PI. Il, Figs. 9-11; Pl. VIII, Fig. 13; Pl. XII, Figs. 1-20; Pl. XIII, Figs. 1-19, 
24-26; Pl. XIV, Figs. 1-12; PL XV, Figs. 1-6, Pl. XVI, Figs. 1-8; Pl. XVI, Fig. 4; Pl. XX, 
Figs. 1, 2. 
Remains of Undetermined Reptiles allied to Hadrosaurus. 
a. Page 97, Humerus, from Monmouth Co., N. J. Pl. XVII, Figs, 1-3. 
b. Page 98, Fragments of femora, from Gloucester Co., N. J. 
c. Page 99, Fragments of a femur and fibula, from Monmouth Co., N. J. 
