m 



THE MATHAfMlIA OF NORTH AMKKICA. 



101 



tcinl nearly as far forwards as the orbils, and .siirrouiid the tail to its 

 y t'xtreinity. Muzzh; bhick. 



MiKxiiydiicnln. '"• •''!"■ 



» I Totiil l('Mj;tli :! <>. 



Li'iiitlli to <'iintliiis oris (strtiif;lil ) 2. ti'i 



. LiMi^lli III ,i;iil.ir I'dld (I. 



Lciijitli I" liniiii If*. 7 



Wi.ltlM.rii.a.l :!.'^ 



"•■• Wiiltli iilmvc i'ciiiorii 'i.'2'i 



'l'h(^ sliach's of cohuatioii in this creatiiri^ are those of the Amhbixtnmn 

 oiKiriiin, liiit arc dilVcrciitly arraii<;ed. 



X(». .'>7S(;; 1 spec; (irahaiiiville, S. C. ; I»aih\v. 



: ( 



CHONDKOTl'S MlCl>'OSrOMrS Cope* 

 Amciicaii N':i turn list, l"^"<7, |i. f^S. 



.Imhiiisliimit piirjiliiiriliciim, Hallow., Vruv. \r. I'liila., I"*.'!!!, p. S (ore Sidhima iidrn por- 



phijniivu, (iii'i'ii ). 

 .Imliliislniiiii niirnislDiiiinii ('(i|to I'roc. .\c. Pliila., I~ti7, |). 'JlHl; Str;iiU'li, Siilaiii., p. ti."i; 



ISoiiicii^^ci', (.'at. I'.atr. (irail. liiit. Miis., cd. ii, Hsj, p. ,f)ii, I'l. ii. lii;-. I. 



Tiiis species is amoii;^ the most shMKh'r <»f Aiiicricaii Ainblystoinida', 



.•'r ■ , and lias other pecidiaritics l»y which it is readily rcco<>'nizal»le. The .skin 



J is very smooth and slippery, with thi^ f>laiHls less evident in the skin 



' than in A. ()i»i<'iim,j<[(}rrs(>ni<tiii(iu, vti;. The skin is eveiy where covered 



with small shallow pits, oidy visible when the nincns is removed, whi(!h 



shows the tail t(» be .sometimes cons|»i(!nonsly f;i"aniilated, the <>rannU's 



probably corresponding to the ends of the {glands. Thei'c are no evi- 



pores or pits of hir.i;i'r size than the others on the head and parotid, iis 



dent in some Ambly.stoinata. 



'i'lie In-ad is very small, narrower than tiie body, with little or no 

 const ri(!t ion at tin; iu>(;k. It is (^oidained about six and one-half to seven 

 tiim-sin the distance to the i:i(»in. Tlic muzzle i< short and wide. The. 

 head is much arched in every direi;tioii, the eyes far forward and latiM'al. 

 'i'lie lower Jaw jtrojectsa little beyond the border of thenpper, e;)neealin^' 

 the latter when viewed from above. The i-yes are distant h'ss than the 

 leiij^th of tln' orbit fiom the nostrils, their anterior extremities sepa- 

 rated by I J, times this nnil. The nostrils are one orbit lenjjth apart. 

 The anterior edye of the orbit falls opposite the middle of the j^apo 

 instead i»f in its posterior third, as in A)iihljfsltt)H(( JcJ}'<;r,s(mi<inHm. The 

 j;iilar fold is <listaiit from tin; snout one-lifth the distance to the yroin. 



Tli(^ body is slender for the jfcniis. There are fonrteen costal fnrrow.s, 

 inclinlinj,' the iii;;iiinal and axilhtry. Tluu'e is a sli;«Iit indication of a 

 dorsal oroove jjosterioily. 



The tail is about two thirds the head and body. It is nearly cylin- 

 drical at ba.se, and then becomes slightly (jompressed, jiiore and more so 

 to the tij), where it is quite flat, but without crest, allhoa.L^li the edjjjes 

 are sharp. Viewed IVoin the siih^s, there' is a constriction at th(\ base of 

 tli(^ t ill. it is one fourth higher in the mi(hlh^ than at the b.ise. 



\\\ 





I 'la If ',>.-., lii-H. 1, 



