620 



BATRACHIA. 



[COI,. DIM. 



dian line, and with elongate pleural 

 element. Type C. gyrinoides. 



FIG. 1182. Cocytinus gyrinoides. 



gyrinoides, Cope, 1874, Trans. Am. Phil. 

 Soc., and Ohio Pal., vol. 2, p. 364, Coal 

 Meas. 



COLLETTOSAURUS, Cox, 1874, Geo. Sur. Ind., 

 5th Ann. Rep., p. 247. [Ety. 

 proper name ; sauros, a lizard.] 

 Founded upon tracks having 

 five digits, and supposed to 

 be related to Batrachians and 

 Salamanders. Type C. indian- 

 ensis. 



indianensis, Cox, 1873, Geo. Sur. 

 Ind., 5th Ann. Rep., p. 247, 

 Coal Meas. 

 COLOSTEUS, Cope, 1869, Trans. Am. 



Phil. Soc., p. 22. [Ety. kolos, imperfect ; 

 osteon, a hone.] No vertebral centra, 

 spines, or sclerotic bones; short ribs; 

 two pairs of short limbs; three sculp- 

 tured pectoral bones ; abdominal region 

 protected by scales in chevron ; ? an- 

 terior teeth longer than posterior, basal 

 half incised sulcate, except two behind 

 the dentary. Type C. foveatus. 



crassisculatus, Cope, syn. for C. scutellatus. 



foveatus, Cope, 1869, Trans. Am. Phil. 

 Soc., p. 24, and Ohio Pal., vol. 2, p. 406, 



* Coal Meas. 



marshi, see Ptyonius marshi. 



pauciradiatus, Cope, 1874, Trans. Am. 

 Phil. Soc., p. 10, and Ohio Pal., vol. 2, 

 p. 408, Coal Meas. 



ecutellatus, Newberry, 1856, (Pygopterus 

 scutellatus,) Proc. Acad. Nat. Sci. Phil., 

 p. 98, and Ohio Pal., vol. 2, p. 407, Coal 

 Meas. 



CRICOTUS, Cope, 1876, Proc. Acad. Nat. Sci. 

 Phil., p. 405. [Ety. krikotos, ringed.] 

 Centra undivided, equal to the disci- 

 form intercentra in the caudal region, 

 intercentra a little smaller in the dorsal 

 region ; neural spines and zygapophy- 

 ses ; developed foramen ; chordae dor- 

 salis persistent; teeth equal, except 

 probably the palatines; limbs short, a 

 facial lyra. Type C. heteroclitus. 



craesidiscus, Cope, 1884, Pal. Bull. No. 39, 

 p. 28, Permian. 



discophorus, Cope, syn. for C. heteroclitus. 



gibsoni, Cope, 1877, Pal. Bull. No. 26, and 

 Proc. Am. Phil. Soc., vol. 17, p. 185, 

 Perncian. 



heteroclitus, Cope, 1876, Proc. Acad. Nat. 

 Sci. Phil., p. 405, Permian. 



hypantricus, Cope. 1884, Pal. Bull. No. 39. 

 p. 30, Permian. 



DENDRERPETON, Owen, 1853, Quar. Jour. 

 Geo. Soc., vol. 9, p. 58. [Ety. dendron, 

 a tree ; erpeton, a lizard, from the cir- 

 cumstance under which the reptile was 

 found.] Teeth in double series; outer 

 simple, flattened, conic : inner series 

 conical, with inflected folds of cement ; 

 teeth on the vomer ; skull-bones corru- 

 gated ; body protected below with ovate 

 or rhomboidal bony scales, imbricated, 

 horny scales above; fore-limbs the 

 larger; tail natatory; vertebrae bicon- 

 cave ; neural arches and bones ossified. 

 Type D. acadianum. 



acadianum, Owen, 1853, Quar. Jour. Geo. 

 Soc., vol. 9, p. 58, and Acadian Geology, 

 p. 362, Coal Meas. 



Fig. 1183 Dendrerpeton acadianum. 

 tooth magnified. 



(a) Cross section of 



obtusum, see Tuditanus obtusus. 



oweni, Dawson, 1863, Quar. Jour. Geo. 

 Soc., vol. 19, p. 469, and Acad. Geol., p. 

 368, Coal Meas. 



DIADECTES Cope, 1878, Pal. Bull. No. 29, 

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

 505. [Ety. dia, crosswise ; decktos, a 

 biter.] Teeth with much compressed 

 crowns, with bracket-shaped edge, longer 

 axis transverse to the jaws, edges of 

 crowns obtuse, no sculpture on the 

 face. Alveoli not separated. External 

 alveolar border more elevated than the 

 internal, inner alveolar border pierced 

 by a fossa behind the inner extrem- 

 ity of each tooth. Type D. sideropel- 

 icus. 



latibuccatus, see Empedias latibuccatus. 



molaris, see Empedias molaris. 



phaseolimis, see Empedias phaseolinus. 



sideropelicus, Cope, 1878, Pal. Bull. No. 

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

 505, Permian. 



DIMETRODON, Cope, 1878, Pal. Bull. No. 29, 

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

 512. [Ety. dimetros, two measures; 

 odous, tooth.] Dentition with enor- 

 mously long incisors and two or three 

 long maxillaries; the pubic bone not 

 distinct from ischium; humerus with 

 trochlear condyles and a defined proxi- 

 mal articular "surface ; neural spines 

 of dorsal and lumbar vertebrae enor- 

 mously elongate ; intercentra present. 

 Type D. incisivus. 



cruciger, Cope, 1878, Am. Naturalist, vol. 

 12, p. 830, Permian. 



gigas, Cope, 1878, Am. Nat., p. 327, (Clep- 

 sydrops gigas,) and Proc. Am. Phil. 

 Soc., vol. 17, p. 515, Permian. 



