8. HTPOPACHTTS. 159 



sclerotica ossified, so as to form a hard annulus round the cornea. 

 Tympanum concealed. Fingers and toes free. Preooracoids pre- 

 sent; no omosternum; sternum cartilaginous, much dilated, and 

 entirely in contact with the coracoids. 

 Brazil. 



1. Stereocyolops incrassatus. 



Stereocyclops incrassatus, Cope, I. c. 



Physiognomy approaching Pipa. Gape large, the muzzle pro- 

 jecting slightly beyond it. Limbs short, humerus and femur in- 

 cluded in the skin. Toes very unequal, the inner and outer very 

 short. An obtuse tubercle at the base of the outer toe. Epidermis 

 everywhere thickened by a chitin-like deposit. Colour everywhere 

 leather-brown ; a narrow white line from end of muzzle to vent. 



Sao Matheos, south of Eio Janeiro. 



8. HYPOPACHUS*. 



Hypopachua, Keferst. Qotting. Nachr. 1867, p. 852. 

 Engystoma, sp., Cope, Proc. Ac. Philad. 1866, p. 131. 

 Systoma, sp., Cope, Journ. Ac. Philad. (2) vi. 1867, p. 194. 



Pupil erect. Tongue elliptic, entire, free behind. Vomerine 

 teeth none. A dermal ridge across the palate between the choanse, 

 and another in front of the oesophagus. Tympanum hidden. 

 Fingers free ; toes with a rudiment of web, the tips not dUated. 

 Outer metatarsals united. Precoracoids present, very weakj no 

 omosternum ; sternum cartilaginous. Diapophyses of sacral ver- 

 tebra moderately dilated. Terminal phalanges simple. 



Tropical America. 



1. Hypopachus variolosus. 



Engystoma variolosum, Cope, Proc. Ac. Philad. 1866, p. 131, and 



Proc. A?ne7: Philos. Soc. 1869, p. 166 ; Brocchi, Bull. Soc. Philom. 



(7) i. p. 192. 

 Hypopachua seebachii, Keferst. Qotting. I. c, and Arch.f. Naturg. 



1868, p. 293, pi. 9. f. 1 & 2. 

 Systoma variolosum, Cope, Journ. Ac. Philad. (2) vi. 1867, p. 194. _ 

 Hypopachua variolosus, Cope, Journ. Ac. Philad. (2) viii. part ii. 



p. 101 ; Brocchi, Miss. 8c. Mex., Batr. pi. 10. f. 2. 



Snout short, subacuminate, moderately prominent, once and a 

 half the diameter of the eye. Fore limb much longer than its 

 distance from the tip of the snout ; fingers moderately elongate. 

 Hind limb stout; it being carried forwards along the body, the 

 tibio-tarsal articulation reacl^s the shoulder, or nearly as far ; toes 



* Capeafulva, Steindachn. Vroh. zooL-bot. Gee. 'Wien, 1864, p. 286, pi. xyii. 

 f. 5, beloDgs perhaps to this genus. Hab, Brazil. 



