296 
Protogaulus, Mylagaulus, Ceratogaulus. 
Familia II. f Wlylagaulidae. 1 ) 
559. f Protogaulus, Riggs, 1899. 
Meniscomys, p., Cope, 1878. 
Riggs, Field Colurnb. Mus., Geol., I, 1899, p. 183. 
2881. f hippodus, Cope — (2238); Riggs, 1. c., fMiocaen. Oregou. 
1899, p. 183. 
560. f Mylagaulus, Cope, 1881. 
Mesogaulus, Riggs, 1899. 
Cope, Amer. Natural., 1881, p. 586. 
2882. f sesquipedalis, Cope — (2509); Riggs, 
Field Coi. Mus., Geol., I, 1899, p. 181; 
Matthew, Mem. Amer. Mus., 1901, p. 377; 
Bull. Amer. Mus., 1902, p. 297. 
2883. f monodon, Cope — (2510); nec Matthew, 
1901. 
ballensis, Riggs, 1. c., 1899, p. 181, fig. 
2884. laevis. Matthew, Bull. Amer. Mus., 1902, 
p. 298. 
monodon, p., Matthew, 1901 (nec Cope), 
Mem. Am. Mus., p. 377, 378, f. 3 — 6. 
2885. f paniensis. Matthew, Bull. Amer. Mus., 
1902, p. 299, f. 4; Douglass, Ann. Carnegie 
Mus., 1903, p. 172, f. 14; p. 191, f. 29. 
2886. sp., Douglass, 1. c., 1903, p. 173, f. 15. 
2887. f? pristinus, Douglass, 1. c., 1903, p. 187, 
188, fig. 26. 
2888. f proximus, Douglass, 1. c., 1903, p. 189, 
fig. 27. 
2889. fsp., Douglass, 1. c., 1903, p. 190, fig. 28. 
fMiocaen. Super. 
Nebraska. 
fMiocaen. Super., 
Nebraska, Montana,. 
fMiocaen. Colorado. 
» 
fMiocaen. 
Colorado, Montana. 
fMiocaen. Montana. 
fMiocaen. Montana. 
f Miocaen. Montana. 
fMiocaen. Montana. 
561. f Ceratogaulus, Matthew, 1902. 
Matthew, Bull. Amer. Mus. Nat. Hist., 1902, p. 291. 
2890.f rhinocerus, Matthew, 1. c., 1902, p. 291, fMiocaen. Colorado. 
299, fig. 1—3. 
2 ) 
J ) Cette famille semble representer les Castoridce dans le groupe des 
Anomaluroidea. 
a ) La famille des Pedetidce est reportee aux Hystrichomorpha. 
