426 



the merycoidodontim: 



Santa Clara Valley, Calif., 13, 14, 123, 242 

 Santa Cruz, N. Mex., 15, 207 

 Santa Fe formation, 6, 207 

 Santa Fe, N. Mex., 11, 14, 15,207 

 Santa Paula, Calif., 13, 14, 123, 242 

 Saskatchewan, 1, 2, 7, 8, 11, 12, 40 

 Bone Coulee, 1 3, 14 

 Cypress Hills, 14, 5 5 

 Swift Current, 13, 14, 39 

 Schlaikjer, E. M., 54, 122, 123, 230, 239, 245, 252, 253, 



255, 256 

 Schliegel's Creek, Nebr., 15, 21 1 

 Schlosser, M., 235 

 schucherti (Chelonocephalus), 5, 10, 16, 18, 256-258; 



fig'd, 256, 257; meas., 291 

 Schultz, C. B., 3 



Scott, W. B., 2, 3, 4, 26, 30, 32, 34, 36, 51, 55, 62, 97, 

 99, 100, 101, 104, 108, 154, 174, 196, 199, 235, 241, 

 255, 259, 265, 267 

 scotti (Mesoreodon), 5, 11, 17, 19, 98, 103-104; fig'd, 



399; meas., 283; skel., 104, 399 

 Scotts Bluff, Nebr., 14, 15, 46, 59, 81, 86, 235, 239, 263 

 Sespe formation 



Basal upper, 4, 5, 96 

 Upper, 4, 5, 105, 123, 242 

 Sesfia = Cyclopidius, 21, 241, 242, 243 

 Sheep Creek formation, 4, 5, 170, 256 

 Simpson, G. G., 4, 170 



simus (Cyclopidius), 5, 10, 15, 18, 241, 242, 243, 249- 

 250,251,252,253,254,255; fig'd, 385, 387; meas., 

 291 

 Sinclair, W. J., 3, 235, 236, 245 

 Sinclair Draw, Nebr., 15, 168 

 Sinus paranasales, 269-270 



Merycochcerus, 269; fig'd, 266, 269 

 Merycoidodon gracilis, 270 

 siouense (Pronomotherium), 5, 6, 11, 15, 20, 160, 161, 

 167, 168-170, 171; fig'd, 168, 169, 170; meas., 286 

 siouxensis (Merychyus), 5, 10, 15, 19, 217, 218, 224, 

 226, 231, 232-233, 234; fig'd, 233, 379; meas., 290 

 Size, 1 

 Skeleton (nearly complete) 



Cyclopidius densus, 245, 409 

 Eporeodon major cheeki, 77, 389 

 socialis, 89, 95, 395 

 thurstoni, 96, 397 

 Leptauchenia decora, 236, 407 

 Merychyus curtus, 224, 407 

 Merycoidodon culbertsonii, 49, 391 



gracilis, 57, 393 

 Mesoreodon chelonyx, 97, 99, 100 

 megalodon, 103, 399 

 scotti, 104, 399 

 Phenacocoelus typus, 185, 397 

 Promerycochcerus carrikeri, 108, 123,401 

 gregoryi, 121, 123, 403 



loomisi, 122, 123,403 

 vantasselensis, 123, 150,401 

 Protoreodon medius, 34, 389 

 Ticholeptus petersoni, 194, 405 

 rusticus, 195,405 



Skeleton (partial) 



Cyclopidius, opp. 24 

 Eporeodon, opp. 24, 63 

 major cedrensis, 75 



relictus, 79 

 occidentalis, 83 

 Hyomeryx breviceps, 40 

 Leptauchenia, opp. 24, 235 



nitida, 241 

 Limnenetes, opp. 24 



platyceps, 45 

 Merychyus, opp. 24, 217 



arenarum minimus, 221 

 elegans paniensis, 228 

 Merycochoerus, opp. 24, 152 

 ccenopus, 153, 373 

 magnus, 155 

 matthewi, 1 5 7 

 proprius, 1 59 

 Merycoides, 1 7 1 

 cursor, 173 

 latidens, 174 

 Merycoidodon, opp. 24, 45 



platycephalus, 60 

 Mesoreodon, opp. 24 



intermedius, 97, 102, 33 3 

 Metoreodon? medius, 206 

 Phenacocoelus, opp. 24, 180 



munroensis, 182 

 Promerycochoerus, opp. 24, 104 

 hollandi, 125 

 lulli, 132 



montanus grandis, 141 

 superbus, 144 



vantasselensis pygmasus, 1 5 1 

 Pronomotherium, 160 

 Protoreodon, opp. 24, 32 

 pumilus, 39 

 sp., 39 

 Ticholeptus, opp. 24, 1 86 

 bannackensis, 188 

 brachymelis, 189 

 breviceps, 191 

 Skull, evolutionary changes in, 2 

 Skull Ridge, N. Mex., 207 

 Skull Spring, Ore., 170,212 



Skull Spring (Sucker Creek) formation, 4, 6, 170, 212 

 Smith River Valley, Mont., 4, 14, 15, 98, 102, 138, 198, 



231, 249, 251, 252, 254, 255 

 smithi (Merychyus) = Ticholeptus smithi, 197 

 smithi (Ticholeptus), 5, 12, 13, 21, 187, 197-198; fig'd, 



198; meas., 287 

 Snake Creek formation 



Lower, 4, 6, 168, 191,212,213,227 

 Upper, 6, 191,209 

 socialis (Eporeodon), 5, 10, 15, 18, 63, 64, 69, 77, 81, 

 86-95,96; brain cast, 263-265, 411; fig'd, 86, 87, 89, 

 90, 91, 93, 94, 95, 263, 395, 411; meas., 265, 282; 

 skel., 89, 95, 395 

 South Dakota, 1, 8, 10, 11, 27, 63, 64, 65, 70, 74, 75, 76, 

 77, 226 



American Horse Creek, 16, 78 

 Big Spring Canyon, 21 1 



