390 TEIID^. 



broad frontonasal ; two prsefrontals, forming a short suture ; a 

 frontal ; two frontoparietals ; a pair of large pariteals separated by 

 an equally long, narrower interparietal ; no occipital ; three large 

 supraoculars and a minute posterior fourth ; a loreal and a freno- 

 orbital ; a row of small infraorbitals ; temples with small irregular 

 shields ; seven upper and six lower labials ; chin-shields very large, 

 three anterior pairs forming a suture ; a double longitudinal row of 

 large transverse gulars ; collar-shields five, elongate. Dorsal scales 

 narrow, exactly similar to those of Meterodactijlus, forming regular 

 transverse series which are not at all interrupted on the median 

 line of the back, and are not separated from the ventrals by any 

 smaller scales ; thirty-nine scales round the middle of the body, 

 including ventrals ; twenty-eight scales from occiput to sacrum 

 inclusively. Ventral plates longer than broad, strongly rounded 

 and overlapping posteriorly, also very similar to those of Heterodac- 

 tylus ; they form eight or ten longitudinal and eighteen transverse 

 series. Four principal pra3anals, two median, with their points 

 touching, and two lateral. Fore limb with large shields, granulate 

 under the arm ; bind limb with large shields anteriorly and interiorly ; 

 hinder side of thighs granulate ; upper side of tibia with very small 

 keeled scales. Tail with a distinct groove along the side ; the 

 scales narrow, forming regular imbricate verticilles, the upper 

 and lateral keeled and sharply pointed, the lower smooth and 

 obtusely pointed posteriorly. Light reddish brown above, reticulated 

 with blackish and with longitudinal series of small light spots ; head 

 variegated with blackish ; lower surfaces cream-coloured, lips and 

 throat black-spotted. 



millim. millim. 



Total length ....... 118 From end of snout to vent 43 



Head 11 Fore limb 12 



Width of head 6-5 Hind limb 19 



From end of snout to fore Tail 75 



limb 17 



Ecuador, 

 a. 5. Canelos. Mr. Buckley [C.]. (Type.) 



17. PRIONODACTYLUS. 



Pantodactylus, part., Peters, Ahh, Bed. Ac. 1862, p. 182. 

 Prionodactylus, O' Shawjlm. Proc. Zool. Sue. 1881, p. 231. 



Tongue moderately elongate, arrow-headed. Lateral teeth com- 

 pressed, bi- or tricuspid. Head with large regular shields ; fronto- 

 nasal separating the nasals, prsefrontals and frontoparietals present ; 

 nostril pierced in the middle of a siugle nasal, or in the suture be- 

 tween two nasals. Eyelids developed, lower with a transparent 

 disk composed of several scales. Ear exposed. Limbs well de- 

 veloped, pentadactyle. Dorsal scales large, hexagonal-lanceolate, 



