M. 



liiict »>r«l»'r, 

 itiun ;;iv('ii 

 11 V. MiiU's 

 w'ini;." or 

 I', HjU'cios is 



me~vic<inHH, 

 Hiial orj^^aii, 

 ul by (liiii- 

 ivo species. 

 i(!k's, wliieli 

 : nulinuMit- 



lii'ir cuiiiii- 

 it in iU'.eonl- 

 n the onltT 



le cliai.u'tcr 

 he majorit;* 

 ^ (listiiiet ill 

 iials, !•. 1").')) 

 L's tlie orltit. 

 1) theHle^,M»- 

 ther genera, 

 ovistieortlie 

 oeeiipy the 

 llary. 



lie L'nulehi, 



deuce. Thr 



)rms ihroiujU 



ilies t)f the 

 Australian 

 ilin. In the 



1(1 Mexican 

 li reputed to 



especially to 



% 



liw. tjoc., I'eb. 



TlIK rtATKACIIlA Ol' NOUTII AMKKKJA. 



86 



I'^lllliliCN. 



l'"'"- In.lian. '•:"'!" 



iili'tli'. 



liiaii. 



I 'i \ |itiiliiarii'lilil 

 AiiililS'-'t'Miiiil.i' 



II.M illil' .. 



I'IrllliMl'illllila' 

 ni'.iiiio^iiatliiihi 

 'I'lioi iiil^r 



S.lllllllMlllll'illn' . 



l'lrin;ilrli.l;r .. 

 Ainithitiiiiida' . - 

 Caciliiila' 



1 ' 

 1 



H . 

 I . 





Nfllic Neil ,| 



lir. 



lU 



•-'11 



llii|iii'al 



r.>tai 



'n.lal 



51 



'J I 



;!i 



. :i 



U(l 

 H 



III! 



:i 

 I 



I J 



in 



1 



;i: 



us 



The temperate rej-ions of the New World is, then, the home of the 

 jiieatest niimher of species of Urodela, after which the temperate re- 

 jiions of the Old World follow. 



The distribution of the families and their spe(!ies in Xorth Ameriiia 

 is as follows: 



The details of distribution are given under the family and generic 

 heads. 



riij/loycuy — This order is probably of considerable antiquity, but no 

 siteeies positively referable to it is known from any pretertiary forma- 

 tion. In tertiary beds we have re])resentativesof ditferent types. The 

 .utniis Chelotriton I'omel from the Miocene of Allier, France, has opis- 

 llioiMcclous vertcbrie like most of the e.\istin{>' sjiecies of Euro])e, and 

 has in addition an expansion of the neural spine of each vertebra, to 

 which tlie epideiniis was closely adherent, yiviiiya row of roujih plates 

 down the middle line of the back. Jleliarchon and I'olysemia of Von 

 .Meyer are known fronj specimens from the Miocene beds of (Jermany. 

 They have apparently the cartilaginous carpus and tarsus of the Amer- 

 ican genera. The .Miocene of Switzerland has liirnished the renuiins of 

 a species, i»robably of Cryptobranchida', which has been referred to the 

 genus Aiidrias by Tschiidi. It is very nnu^h like Cryptobranchus. 



In older foimations we have in the North Aniericau Laramie the 

 genus Scauherpeton Cope, which may well belong to the Urodela, but 

 the skull is unknown. In the Wealden of Belgium the genus Ilyheoba- 

 tnichus Dollo may belong to this order, but the skull is not yet well 

 kuowu. 



