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498 BULLETIN 34, UXITEU STATES NATIONAL MUSEUM. 



PLATE Vin. 



Cryptobraxclius alhyhenieiisis, skull. 

 Fig. 1. Superior face. 

 3. Inferior face. 



3. Left side, exterior. 



4. Left side, interior. 



5. Left maudibular ramus, external side. 



6. Left mandibular ramu.s. internal side. 



PLATE IX. 



(Copied from Wiedersheiin's Kopfskelet der Urodeleii.) 



Fig. 1, 



o 



Siren lactrtimi, skull, left side. 



Siren hiartina, skull, from above, oue-balf the cartilage exposed. 



3. Siren Jacirtina, skull, from below, one-balf the cartilage exjiosed. 



4. Proteus aniininus, skull, left side. 



5. Proteii8 antjiiiuui, skull, from above. 



6. Proteus anguinus, skull, from below. • 



7. Jmphiuma means, skull, left side. 



PLATE X. 



Amphiuma means, skeleton, from below, two-thirds natural size, 



PLATE XL 



Amphiuma means, one-third natural sizt;; from Georgia. Copied from Cope, Proceiil- 



ingsof the American Philosophical .Society, 18~t), p. 442. 

 Fig. L Skull, left side. 



2. Skull, from above. 



3. Skull, from below. 



4. Skull, right half, from within. 



5. Left mandibular ramus, external view. 



6-'J. An anterior d(n\sal vertebra; tig. 6, front : 7, rear; t, bottom; St, top. 

 Chthonirpeton indiiitinctnm, R. A, L., three-eighths natural size; from Brazil. Coiiiid 



from Wiedersheim, Die Anatomic dtT Gymnophionen. 

 Fig. I. Skull, from above. 



2. Skull, from below. 



3. Skull, left half, from within. 



4-G. One and parts of two other vertebni' : 4, from al)ove ; '>, from below • li. 

 right side. 



PLATE XIL 



Amphiitma means Gard. three-toed form : viscera in place, except that the alimcMtiuv 

 cauai is ilisplaced to the right side of the animal. Two-thirds natuiiil 

 size. 



PLATE XIII. 



Hyoid apparatus of Batr.achuj. Figs. 1,3, '•,() dissected and drawu by E. E.Gait : .;, 



4, and 7, by E. D. Cope. 



Fig. 1. Xecturus mnvulalus, small, x 3. 



2. Proteus angninus, adult, j. 



3. Cryptobranchna alleglnnieiisis, adult, \. 



4. ilegahbatrachus masimns, adult, \. 



5. Am})hiuma mcanii, small, X 4. 



6. Siren lacertina, small, x 4. 



7. Jchthyophis ylutinosui. \. 



