T.isr OK I'lMRKS IN Tkxt. vii 



Hyrac/iyus pn'scits. Mandiljle and anterior part of skull 



Hyracliytis. Crown view of last left upper molar . . .158 



Helodermoidcs tiibcrculatus. Top of skull, upper and lower views . 160 



" " Part of mandible . .... 160 



Mesohippus latidots. Last upper premolar and the three molars of 



left side. ...... 161 



Trigenictis socialis. Portion of skull. Crown view of teeth . .162 



Oreodon macrorJiiniis. Side view of skull . . . . .164 



Mesocyon dniintnondamts. Skull, side view ..... 165 



" " Skull, palate view . . . . .166 



Leptomctyx trajisinontanns. Skull. Crown view of teeth . .167 



Provierycochcerus minor. Skull and mandible, side \Mew . . .169 



Talpa platybracJiys. Humerus . . . . . . .172 



Mylagaulus paniensis. Portion of mandible showing teeth . .172 



Mylagauhis. Premolar and molar . . . . . . .173 



^hirodoti brachygnatJms. Left mandibular ramus . . . -174 



Hcsperhys vagrans. Right ramus of mandible. Crown view of teeth 



of same ....... 175 



Poairiphes pahidicola. Right view of skull . . . . .177 



Merychyics smithi. Part of mandible . . . , . .179 



Vertebra of fish, end view. ........ 181 



Sciitrus sp. Portion of mandible with incisors and anterior teeth . 181 

 Scitirus arcionyoides. Left ramus of mandible . . . .182 



PalcEarctomys mo7itanus. Skull and mandible . . . . .183 



" niacrorhintts. Skull from right side . . . .184 



Skull, lower view .... 185 



Mylagaulus pristinus. Left ramus of mandible, side and top views . 188 

 proximus. Inside and top views of mandible . .189 



Mylagaulus. Portion of mandible showing position of teeth . . 190 



Mylagatilus patiieiisis. Permanent premolar, side and crown views . 191 

 Mustela minor. Left ramus of mandible . . . . . .192 



Dinocyon ossijragus. Portion of skull . . . . . -193 



" " Skull, palate view . . . . . .194 



Aphelops ccraiorJiiiius. Nasals . . . . . -195 



" " Left ramus of mandible, inner view . . 196 



Aferycodus neca/us. Portion of antler . . . . . -197 



Mervcodus. " " '< • . . . . .198 



Palate views of skulls of two guanacos taken from the same band at 



Cape Fairweather, Patagonia, showing remarkable individual 



variation in dental and cranial characters ..... 444 

 Ideal section of Miocene formations from Squaw Butte to south side 



of Running Water River, Sioux Co., Nebraska .... 474 



157 



