1. scAPHioprs. 433 



III. Sacral vertebra articulated to coccyx by one condyle ; toes 

 free or very shortly webbed. 



Vomerine teeth none ; sternum with a bony style ; vertebrae pro- 

 coeKan 5. LeptobracMum, p. 440. 



Vomerine teeth ; sternum with a bony style ; vertebrae procoelian. 



6. Xenophrys, p. 441. 



Vomerine teeth ; sternum with a bony style ; vertebrae opistho- 

 coelian; upper eyelid prolonged into a horn. 



7. Megalophrys, p. 442. 



Vomerine teeth; tongue entirely adherent; vertebrae opisthocoe- 

 lian (?) 8. Asterophrys, p. 443. 



1. SCAPHIOPUS. 



Scaphiopus, Holhr. X.-Amer. Serp. i. p. 85; Tschudi, Batr. p. 83; 



Dum. 4'- Bibr. viii. p. 471 ; Giinth. Cat. p. 38 ; Cope, Nat. Hist. 



Rev. 1865, p. 108, and Journ. Ac. Philad. (2) vi. p. 81. 

 Spea, Cope, Journ. Ac. Philad. (2) vi. p. 81. 



Pupil erect. Tongue subcircular or oval, entire or slightly nicked, 

 and free behind. Vomerine teeth in two small groups. Tympanum 

 more or less distinct, or hidden. Fingers generally with a rudiment 

 of web ; toes webbed ; tips of fingers and toes not dilated. Inner 

 metatarsal tubercle shovel-shaped ; outer metatarsals separated by 

 web. Omosternum cartilaginous, nidimentary ; sternum a cartila- 

 ginous plate. Vertebrae procoelian ; sacral vertebra with rather 

 strongly dilated diapophyses, confluent with coccyx. 



I^. America; llexico. 



Synopsis of the Species. 



I. Derm of head involved in cranial ossification. 



A round gland on each side of the thorax, 



near the axiUa . . . . ; 1. soUtarius, p. 434. 



No pectoral gland ; canthus rostralis ob- 

 solete ; loreal region obliqiie 2. couchii, p. 434. 



No pectoral gland ; canthus rostralis 



strong ; loreal region nearly vertical . 3. rectifrenis, p. 435. 



II. Derm of head fredvfrom cranial ossification. 



1. Eustachian tubes moderate. 



Vomerine teeth between the choanae ; 



tympanum distinct 4. hammondii, p. 435. 



Vomerine teeth between the choanas ; 

 tympanum concealed or scarcely visi- 

 ble : skin nearly smooth above 5. homhifrons, p. 435. 



Vomerine teeth on a level with the hinder 

 edge of the choanae ; tympanum con- 

 cealed 6. dugesii, p. 436. 



2v 



