1. SCAPHIOPTJS. 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- 

 coelian 5. Leptobrachium, p. 440. 



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



6. Xenophrys, p. 441. 



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

 coelian ; upper eyelid prolonged into a horn. 



7. Megalophrys, p. 442. 



Vomerine teeth; tongue entirely adherent; vertebrse opisthocoe- 

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



1. SCAPHIOPUS. 



Scaphiopus, Holbr. N.-Amer. Jlerp. i. p. 85 ; Tschudi, Batr. p. 83 ; 



num. Sr Bib?: viii. p. 471 ; CHinth, 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, rudimentary ; sternum a cartila- 

 ginous plate. Vertebrae procoelian ; sacral vertebra with rather 

 strongly dilated diapophyses, confluent with coccyx. 



N. America; Mexico. 



Synopsis of the Species. 



I. Derm of head involved in cranial ossification. 



A round gland on each side of the thorax, 



near the axilla 1. solitarius, p. 434, 



No pectoral gland ; oanthus rostralis ob- 

 solete ; loreal region oblique 2. coudhii, p. 434. 



No pectoral gland ; canthus rostralis 



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



II. Derm of head free from cranial ossification. 

 1. Eustachian tubes moderate. 



Vomerine teeth between the choanse ; 



tympanum distinct 4. hammondii, p. 435. 



Vomerine teeth between the choanse ; 

 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 choanse ; tympanum con- 

 cealed 6. dttgesii, p. 436. 



2y 



