312 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



Group II. Ceratopiiuydes. — Frontoparietal bones fully developed ; toes free or 

 (slightly webbed; tlie external metatarsi bonnd ; terminal pbalanj^es simple: 

 .sternum a cartilaginous plate (so far known, emarginate); ear perfectly devel- 

 oped ; tongue entire, little free. 

 a. Cephalic derm distinct ; no postorbital arch. 



Pupil vertical ; prefrontals well separated ; vomerine teeth ; toes 



webbed ; inner finger opposable MiiroJijsis'' Cope 



Pupil horizontal; prefrontals more or Jess united; vomerine teeth : 

 toes webbed; inner finger not opposable ; abdominal derm areo- 



late ; a strong cuneiform shovel Odontoplinjnus R. & L. 



Prefrontals widely separated; eyelids with dermal prolongation; 

 vomerine teeth; toes nearly free; cranium elevated ; form toad- 

 like ; inner finger not opposable Stomhua t Boie. 



Prefrontals in close contact; eyelids not prolouged ; vomerine teeth 

 on palatine arch; toes free; cranium broad; pupil horizontal; 



form squat; abdomen smooth Zachcenus Cope. 



aa. Cranial derm involved in ossification; no jjostorbital arch. 



Pupil vertical; thumb opposed ; toes webbed ; vomerine teeth ; pre- 



fontals separated ; no dorsal shield Chirolejytis t Gthr. 



aaa. Cephalic derm involved in cranial ossification; a postorbital bony arch. 



Similar to Cerat ophrys as below, but without dorsal dermal osseous 



shield Phrynoceriis Tsch. 



Prefrontals wholly or in part separated; eyelids with a dermal pro- 

 longation ; vomerine teeth; toes more or less palmate; cranium 

 elevated; form toad-like; iuner finger not opposable; pupil 



transverse; a dorsal dermal osseous shield Ceratoplirys Boie. 



Group III. Criki^.— Frontoparietal bones embracing a large fontanelle; cephalic 

 derm free; external metatarsi bound; terminal phalanges simple; jirefroutals 

 never closely united, rarely in contact; sternum not distinguisliahle into style and 

 disk, broad, emarginate, cartilaginous. 

 a. Ethmoid bone with superior arch complete ; toes webbed. 



Pupil erect ; vomerine teeth Helioporus Gray. 



Auditory apparatus minute ; vomerine teeth ; pupil horizontal; ster- 

 num with a proximal semiossified portion Cojjlia'us ^ Cope. 



aa. Ethmoid arcli complete, or nearly so ; digits free; no cuneiform shovel. 

 Large parotoid glands; no vomerine teeth; pupil horizontal. 



Hyperolia Gray. 



No parotoid glands; vomerine teeth in transverse series; xiphister- 



num broad; pupil horizontal Borhoroca'Aes \\ Bell. 



No parotoid glands ; pupil erect ; sternum a plate Perialia Gray. 



No parotoid glands; pupil horizontal; vomerine teeth wanting or in 

 minute fasciculi ; sternum slender, without bony deposit ; abdo- 

 minal integument usually areolate Crinia Tsch. 



aaa. Ethmoid arch cartilaginous above ; digits free ; no shovel. 



No parotoids ; vomerine teeth ; pupil round ; auditory organs rudi- 



niental Eiisoph us Cope. 



aaaa. Ethmoid arch? No metatarsal shovel; "auditory organs wanting;" toes 

 slightly webbed. 



Vomerine teeth : no parotoids Alsodes Bell. 



* Type Cliiroleptes albogutiatus Gthr. 



t Type Ceratophrys boiei Wied. 



t Phractops Peters. 



^ Telmatohius Boulenger, not of Wiegmaun. 



II Includes L\mnody»asles Fitz., Giinther. 



