174 ENGYSTOMATIDE. 
Pachybatrachus, Keferst. Arch. f. Naturg. 1868, p. 273. 
Systoma, sp., Cope, Journ. Ac. Philad. (2) vi. 1867, p. 193. 
Pupil erect. Tongue oval, entire and free behind. Choanz very 
large, with a dermal movable flap, which can close the nostril ; two 
small bony prominences close together, between and on a level with 
the hinder edge of the choanze ; a small papilla on the hind margin 
of each choana; a narrow denticulated dermal ridge across the 
sphenoidal region; another, very broad, in front of the cesophagus. 
Tympanum hidden or very indistinct. Fingers free; toes webbed 
at the base, the tips not dilated. Outer metatarsals united. Pre- 
coracoids none ; sternum a large cartilaginous plate. Diapophyses of 
sacral vertebra rather strongly dilated. Terminal phalanges simple. 
India. 
1. Cacopus systoma. 
Uperodon marmoratum, Giinth. Cat. p. 49. 
Rana systoma, Schneid. Hist. Amph. i. p. 144; Peters, Mon. Berl. 
Ac. 18638, p. 82. 
Engystoma marmoratum, Cuv. R. A.; Guérin, Icon. Rept. pl. 27. 
f. 3: 
Systoma leschenaultii, Tschudi, Batr. p. 86. 
Uperodon marmoratum, Dum. § Bibr. p 749. 
Cacopus systoma, Giinth. Rept. Brit. Ind. p. 415. 
Systoma marmoratum, Steindachn. Novara, Amph. p. 36. 
? Pachybatrachus petersii, Keferst. Arch. f. Natwrg. 1868, p. 274, 
pl. 6. f. 8-10. 
Sternal apparatus. 
Habit very stout. Head small; mouth small; snout rounded, 
without canthus rostralis, as long as or slightly longer than the 
diameter of the orbit; interorbital space twice or not quite twice 
the width of the upper eyelid. Fingers moderate, first a little 
shorter than second; toes rather short, webbed at the base ; subar- 
ticular tubercles generally rather indistinct; two strong, com- 
pressed, shovel-shaped, metatarsal tubercles, inner very large, as 
long as second toe. Hind limb short. Skin smooth, upper surfaces 
sometimes tubercular. Olive or pinkish brown above, marbled with 
blackish brown ; beneath whitish, immaculate. Male with a sub- 
gular vocal sac. 
India. 
