mm. Median length of skull 26 Width across squamosal enlargement 30 Width across base of horns 25 Length from muzzle to tip of horn 40 Length of horn 10 Width of horn at base 4 Length of orbit 4 Width of orbit 3 Interorbital span 6 Nos. 4472 and 4473, U. S. National Museum, from Linton, Ohio, Coal Measures. mm. Median length of skull 16 Maximum width of skull 20 Length of horn from base 7 Length of orbit 3 Interorbital width 3.5 Length of vertebral column to sacrum 33 Length of femur 5.5 Length of tibia and fibula 3 Length of second digit (incomplete) 7 Length of metatarsal 1.5 Length of clavicle 6 Width of clavicle 3.5 [Illustration: Fig. 25. Restoration of skeleton of _Eoserpeton tenuicorne_ Cope. × 1 .5. Skull: _pmx_, premaxilla; _n_, nasal; _fr_, frontal; _par_, parietal; _pf_, prefrontal; _mx_, maxilla; _pof_, postfrontal; _po_, postorbital; pp, postparietal; _j_, jugal; _qj_, quadratojugal; _spt_, supratemporal; _sq_, squamosal; _tab_, tabulare. Skeleton: _ic_, interclavicle; _cl_, clavicle; _sc_, scapula; _h_, humerus; _r_, radius; _u_, ulna; _c_, carpus; _sr_, sacral rib (uncertain?); _il_, ilium; _f_, femur; _fb_, fibula; _t_, tibia; _ts_, tarsus. ]