260 BULLETIN 33, UNITED STATES NATIONAL MUSEUM. 



Toes webbed ; tympanic drum not iuclosed by boue ; steruum a 



plate B iifo Laur. 



Toes webbed; tympauic drum iuclosed with ossilicatiou. 



Otaspis Cope. 



Toes webbed ; nostrils directed upwards Nectes Bleeker. 



ffl3. Tympanic chamber wanting. 



Cranial derm free ; digits webbed 0??of is Cope. 



Cranial derm free ; digits not distinct, inclosed in a common in- 

 tegument Crcpidoplivyne *Cope. 



Cranial derm ossified ; toes webbed .Cranoplwyue tCope. 



aa. Vomerine teeth present. 



Sternum rudimentary ; toes webbed Notaden tGunlh. 



BB. Tongue bauud or retractile posteriorly ; slightly free anteriorly. 



Sternum rudimentary ; pupil erect ..llhinoplirijnus Dam. & Bibr. 

 AA. One condyle for the urostyle. 



Pupil vertical ; no vomerine teetb ; toes free ; a sternal style. 



ScutUjer Theob. 

 II. Terminal phalanges T-shaped. 



Fingers and toes irore or less webbed ; the tipsdilatediutodisks ; 

 sternum cartilaginous..^ Ncctophriine Buch. & Peters. 



The distribution of tbese genera is as follows : 





a 



< 



o . 



o 



• '3. 





o 





1 



4 



























4 

















1 



4 





'^xdo 





33 



1 



10 



9 



25 

















1 







1 

 1 

 1 



1 

















































1 

















1 











1 





3 













Total 



6 



41 



10 



10 



5 



30 



BCFO Laureuti. 



Syn. Kept., p. 25 ; Wagl., Syst. Amph., p. 206 ; Tschudi, Batr., p. 88 ; Dum. 

 «& Bibr., VIII, p. 662 ; Giiuth., Cat., p. 55; Nat. Hist. Rev., 1865, p. 102. 



Oxyrhijnclms Spix, Spec. Nov. Test. Ran., p. 49 ; Espada, Viaj. Pacif., Vert., p. 170. 



Otiloplms Cuv., R. A. ; Tschudi, Batr., p. 89 ; Glinth., Cat., p. 69 ; Cope, I. c. 



Hylap^esia sp. Boie, Isis, 1827, p. 294. 



Chaunus sp. Wagl., Isis., 1828, p. 744. 



Pliryne (Oken) Fitz. Syst. Reptil., i, p. 32. 



Chilophryuc Fitz. /. c. ; Cope, Proc. Ac. Phila., 1862, p. 357. 



Phrynoidis Fitz. I. c; Cope, I. c, and Nat. Hist. Rev., 1865, p. 102, pars. 



Anaxyrus Tschudi, Faun. Per., ITerp., p. 78. 



Sclmmaderma Smith, 111. S. Afr., Rept., App., p. 23; Giiuth., I. c, p. 138; Cope, I. c. 



*Crepidlus Cope preoccupied. iCrauojisis Cope preoccupied. 



tThis genus may have a cranial fonlanolle. The skull has not been examined. 



