618 



B ATRAC HI A. 



[AMP. — BOI,. 



Amphibamus, Cope, 1865, Proc. Acad. Nat. 

 Sci. Phil., p. 134. [Ety. amphi, both ; 

 bama, a step ; from its two modes of 



Fig. 1178.— Amphibamus grandiceps. Two diam. 



progressing, swimming, and walking.] 

 Teeth small, simple, equal on margins 

 of jaws; sclerotic plates on eye; table 

 of vertex produced ; no horns ; pro- 

 podial bones distinct ; tarsus cartilag- 



inous ; neural spines of caudal verte- 

 brae well developed ; (?) centra. Type 

 A. grandiceps. 



grandiceps, Cope, 1866, 



Proc. Acad. Nat. Sci. 



Phil., p. 134, and Geo. 



Sur. 111., vol. 2, p. 135, 



Coal Meas. 

 Anisodexis, Cope, 1882, Pal. 



Bull. No. 35, and Proc. 



Am. Phil. Soc, p. 459. 



[Ety. anisos, unequal ; 



(lexis, a bite.] Teeth on 



{)remaxillary ; maxil- 

 ary, and dentary bones 

 of unequal lengths, 

 some very large, others 

 very small ; dentinal 

 inflections straight, 

 nearly reaching the 

 pulp-cavity; cranial 

 bones sculptured ; ver- 

 t e b r jc rhachitomous. 

 Type A. imbricarius. 

 imbricarius, Cope, 1882, 

 Pal. Bull. No. 35, and 

 Proc. Am. Phil. Soc, 

 p. 459, Permian. 

 Akch/k.ohelus, Cope, 1877, 

 Proc. Am. Phil. Soc, 

 vol. 17, p. 192. [Ety. 

 archaios, ancient; belot, 

 a weapon.] Maxillary 

 bone with a large, hol- 

 low tooth, with two 

 opposite shallowgrooves 

 at the base; crown 

 hollow ; skeleton un- 

 known. Type A. velli- 

 catus. 

 vellicatus, Cope, 1877, 

 Proc. Am. Phil. Soc, 

 vol. 17, p. 192, Per- 

 mian. 

 Bapiietes, Owen, 1853, Jour. 

 Geo. Soc. London, vol. 

 10, p. 207. [Ety. bapto, 

 * I dip or dive, a diving 

 animal.] Teeth conical, 

 curved ; outer series 

 one or two lines in 

 diameter, inrfer series 

 three lines or more; 

 implanted and anchy- 

 losed in shallow sockets; 

 lower third of teeth 

 longitudinally striated ; 

 cranial bones corru- 

 gated ; head broad. 

 Type B. planiceps. 

 minor, Dawson, 1870, Can. 

 Nat. and Geol., Coal 

 Meas. 

 planiceps, Owen, 1853, 



Jour. Geo. Soc. London, vol. 10, p. 207, 



and Acad. Geol., p. 359, Coal Meas. 

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



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



506. [Ety. bolos, a lump ; sauros, a liz- 



