^im 



^ 



v 



Hi 



40 I!i:llktin hi, i:mted statkr natkixal mtskum. 



tiiict i-yoliils. TIr'.v art' (»v;il in niilliiic, the l()ii,i,' (liiiiiictcr antt'i'opos. 

 ti'iior." Tlu'.v are widely sepiir.itc.i IV(»iii eai;ii otiier and are not far Iroin 

 t!ie labial bonier. Tlie Jaws are eiiiial in front, and the niuzzle is \wv- 

 fectly tiat. The n!)i)er lip is not I'endnlus except a", its i)0.sterior end, 

 where it is also tinck. The free lower lip is deciirved, and extends only 

 about one third tlie distance round the lower Jaw. 



The mouth is wide, and the rietus falls below the posterior eanthns 

 of the eye. The luaxillopreuiaxillary arc of teeth extends to a ixtint a 

 little posterior to a line dropped from the posterior edge of the eye. 

 The voMiei()j>alatin(' seri;s is (juite close to the niaxillopreuiaxillary, and 

 extend al)out one half way as far posteriorly as the external row. At 

 the middle of the arc it sometimes presents a (ionvexity l)aekwards for a 

 short distance. At each ol ilsextri niitiesissitnat.'d the posterioi'nnslril, 

 which is an oval nu)re or less open, and never a slit, as in the C./iiscus. 

 Its position dilfcrs from that seen in .1 mphhnna menus and XcctKnis in its 

 beiuj;iit the end of the row, and not external to it. The roof of the mouth 

 is everywhere Hat. The ton;;ue is wide and is considerably free in Ironl, 

 the free border iiarrowinj,' laterally and jjosteriorly. It nearly fills the 

 floor of the mouth, leaving;' but a narrow space between it and the man- 

 dibular arc. Its surface is thrown into numerous elevated folds, which 

 are thin, and generally anteroposterior in direction. They inter(!oni- 

 municate by lesser (»bli(iue folds, which with other delicate ridges form 

 anet \vo>k between the principal ones. In old specimens or badlypre- 

 serv'.i ones the plica' may be tlattcned or lowered. 



The legs are (piite short ; when pressed to the side they are separated 

 Ity a space equal to l.'J.j the length of the anterior limb. The lingers 

 are short and rather free, and the external one is considerably shortej' 

 than the internal one. The others are subsequal. An extensive fold 

 of the skin extends from the axilla to near the extremity of the external 

 finger, forming the posterior expanded border of the limb. It is mo>t 

 prominent at the h)wer part of the ui)i>cr arm. The posterior t(»es aie 

 rather short, ami are free from web as to the phalanges. The first is 

 the shortest, and the second a little exceeds the fifth. The third ami 

 fourth are subetjual, and, with the fifth, are somewhat depressed. Ibis 

 appearance is produced by adeimal wing on the external border, which 

 increases in width from the third to the fifth, becoming veiy wide on 

 the latter. It continues from the fifih toe on the hinder border of the 

 leg to the base of the thigh, (iorrespouding with the similar fold on the 

 fore leg. The ei>idermis is not hardened into ungues in this species. 



The skin is perfectly smooth, but is thrown into a longitudinal iindir 

 lating fold on the sides betwten the fore and hind legs. Th s fold i^ 

 obsolete in some specimens, apparently on account of the distension of 

 the luHly with food or eggs. There are a shallow median dorsal groov.' 

 and lourteen costal grooves. The latter are not distinct on the back or 

 belly, and are best seen on tlu- sides (.f the latter. The tail has a fre.' 

 dermal border oi: its superior edge, but none on the inferior edge, thus 



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