PI,E.— SAU.] 



B ATRAC HI A. 



625 



triangular ; body and tail extremely 

 elongate ; dorsal vertebrae without ribs, 

 caudals without dilated spines ; no 

 vertebra; armature ; no limbs. Type 

 P. linearis, 

 linearis, Cope, 1871, Proc. Am. Phil. Soc, 

 p. 177, and Ohio Pal., vol. 2, p. 367, 

 Coal Meas. 

 serpens, Cope, 1871, Proc. Am. Phil. Soc, 

 p. 177, and Ohio Pal., vol. 2, p. 367, 

 Coal Meas. 

 Pleuroptyx, Cope, 1875, Ohio Pal., vol. 2, 

 p. 370. [Ety. pleura, a rib ; ptyx, a fold, 

 wing.] Founded upon the vertebral 

 column and ribs ; vertebras of moderate 

 length, zygapophyses well developed, 

 short neural spine in the dorsal region, 

 not. sculptured; ribs short, stout, and 

 support a wing on the posterior or con- 

 vex border, which expands downward, 

 and then abruptly contracts to the 

 shaft; it is broad and truncate, and in- 

 cludes a medullary cavity partially filled 

 with cancellated tissue. Type P. clavatus. 

 clavatus, Cope, 1875, Ohio Pal., vol. 2, p. 

 370, Coal Meas. 

 Ptyonius, Cope, 1875, Ohio Pal., vol. 2, p. 

 373. [Ety. ptyon, a fan.] Form elon- 

 gate, with 

 long tail and 

 lane e o 1 a t e 

 cranium; 

 limbs weak, 

 only poste- 

 rior known ; 

 three pec- 

 . toral shields ; 

 abdomen 

 protected by 

 packed os- 

 seous rods 

 arranged in 

 chevron with 

 angle direct- 

 ed forward ; 

 neural and 

 h ae m a 1 

 spines of 

 caudal ver- 

 tebrae ex- 

 panded and 

 fan-like ; ribs 

 well devel- 

 oped ; teeth 

 small, nu- 

 merous, sim- 

 ple or groov- 

 ed. Type P. 

 nummifer. 

 marshi, Cope, 

 1875, (Colos- 

 teus marshi,) 

 Trans. Am. 

 Phil. Soc, 

 vol. 14, p. 24, 

 and Ohio 

 Pal., vol 2, p. 375, Coal Meas. 

 nummifer, Cope, 1875, Ohio Pal., vol. 2, 

 p. 374, Coal Meas. 



pectinatus, Cope, 1868, (Sauropleura pec- 

 tinata, Proc. Acad. Nat. Sci., p. 216, and 

 Ohio Pal., vol. 2, p. 377, Coal Meas. 



serrula, Cope, 1871, (Oestocephalus ser- 

 rula,) Proc Am. Phil. Soc, p. 177, and 

 Ohio Pal., vol. 2, p. 379, Coal Meas. 



vinchellanus, Cope, 1871, (Oestocephalus 

 vinchellanus,) Proc. Am. Phil. Soc, p. 

 177, and Ohio Pal., vol. 2, p. 376, Coal 

 Meas. 

 Pygopterus, Agassiz, 1833, Recherch. Poiss. 

 Foss. 



scutellatus, see Colosteus scutellatus. 

 Raniceps, Wyman, 1858, Am. Jour. Sci. and 

 Arts. The name was preoccupied by 

 Cuvier,and Pelion has been substituted. 



lyelli, see Pelion lyelli. 

 Rhachitomus, Cope, 1878, Pal. Bull. No. 

 29, and Proc. Am. Phil. Soc, vol. 17, p. 

 526. [Ety. rachis, the backbone ; tomos, 

 cut.] Syn. for Eryops. 



valens, syn. for Eryops megacephalus. 

 Sauropleura, Cope, 1868, Proc Acad. Nat. 

 Sci. Phil., p. 215, and Ohio Pal., vol. 2, 

 p. 402. [Ety. sauros, a lizard ; pleuron, 

 a rib.] Vertebrae and ribs well devel- 

 oped ; limbs four, large ; five digits in 

 the fore foot ; carpus cartilaginous ; ven- 

 tral armature of closely arranged rhom- 

 boidal scuta, arranged in lines closely 

 placed in chevrons, with the angle an- 

 terior; teeth of Labyrinth odont type, 

 with deeply inflected enamel and acute 

 apeX. Type S. digitata. 



digitata, Cope, 1868, Proc. Acad. Nat. Sci. 

 Phil., p. 216, and Ohio Pal., vol. 2, p. 

 403, Coal Meas. 



longipes, see Tuditanus longipes. 



newberryi, Cope, 1875, Ohio Pal., vol. 2, 

 p. 404, Coal Meas. 



pectinala, see Ptyonius pectinatus. 



remex, see Oestocephalus remex. 

 Sauropus, Lea, 1849, Trans. Am. Phil. Soc, 

 vol. 10. [Ety. sauros, a lizard ; pous, 

 foot.] Founded upon tracks ; five robust 

 toes, the inner having the same direc- 

 tion as the others, and not divergent as 

 in Chirotherium ; palm or sole short, 

 wide. Type S. primaevus. 



Fig. 1192.— Ptyonius serrula. 



Fig. 1193.— Sauropus primsevus. 



primaevus, Lea, 1849, Trans. Am. Phil. 



Soc, vol. 10, Coal Meas. 

 sydnensis, Dawson, 1868, Acad. Geol., p. 



358, Coal Meas. 

 unguifer, Dawson, 1872, Geo. Mag. Lond., 



vol. 9, Coal Meas. 



