498 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



PLATE Vin. 



Cryptoiranchus aUegheniensis, skull. 



Fig. 1. Superior face. 



2. Inferior face. 



3. Left side, exterior. 



4. Left side, interior. 



5. Left mandibular ramus, external side. 



6. Left mandibular ramus, internal side. 



PLATE IX. 



(Copied from Wiedersbeim's Kopfskelet der Urodelen. ) 



Fig. 1. Siren lacertina, skull, left side. 



2. Siren lacertina, skull, from above, one-balf the cartilage exposed, 



3. Siren lacertina, skull, from below, one-half the cartilage exposed, 



4. Proteus anguinus, skull, left side. 



5. Proteus anguinus, skull, from above. 



6. Proteus anguinus, skull, from below. 



7. Amphiuma means, skull, left side. 



PLATE X. 



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



PLATE XI. 



Amphiuma means, one-third natural size ; from Georgia. Copied from Cope, Proceed- 

 ings of the American Philosophical Society, 1886, p. 442. 

 Fig. 1. Skull, left side. 



2. Skull, from above. 



3. Skull, from below. 



4. Skull, right half, from within. 



5. Left mandibular ramus, external view. 



6-9. An anterior dorsal vertebra ; fig. 6, front ; 7, rear ; 8, bottom ; 9, top. 

 Chthonerpeion indistinctum, E. & L., three-eighths natural size; from Brazil, Copied 



from Wiedersheim, Die Anatomic der Gymnophionen. 

 Fig. 1. Skull, from above. 

 . 2. Skull, from below. 

 3. Skull, left half, from within. 



4-6. One and parts of two other vertebrae ; 4, from above ; 5, from below ; 6, 

 right side. 



PLATE XII. 



Amphiuma means Gard. three-toed form ; viscera in place, except that the alimentary 

 canal is displaced to the right side of the animal. Two-thirds natural 

 size. 



PLATE XIII. 



Hyoid apparatus of Batrachia. Figs. 1, 3, .5, 6 dissected and drawn by E. E. Gait ; 2, 



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



Fig. 1. Necturus maculatus, small, x 3. 



2. Proteus anguinus, adult, |. 



3. Cryptobranchus aUegheniensis, adult, \. 



4. Megalobatrachus 7naximus, adult, {. 



5. Amphiuma means, small, X 4. 



6. (Siren lacertina, small, X 4. 



7. Ichthyophis glutinosus, y. 



