Mr. G. A. Bouleugcr on a new Iguanoid Lizard. 85 



Dlscoglossus from that of other Disco glos8ida3 * ; but there is 

 a character in the rnaxilhuy which is very striking and which 

 I think I can discern in t'.ie fossil, although 1 am not quite 

 sure about it — that is, this bone sends up a broad process wliich 

 joins the anterior limb of the T-shaped squamosal, whilst in 

 Alytes and Bomhinator the maxillary tapers posteriorly 

 without sending off" any sort of process. 



XI. — Description of a new Genus of Iguanoid Lizards, 

 By G. A. BOULENGER. 



APTYCHOL.EMUS. 



Tympanum distinct. Body cylindrical ; no dorso-nuchal 

 crest. Dorsal scales equal, juxtaposed, keeled ; lateral scales 

 granular j ventral scales imbricate and keeled. Head-scales 

 small ; no gular fold, no gular sac. No femoral or prasanal 

 pores. Digits subcylindrical, with smooth lamelke below. 

 Tail very long, cylindrical. Lateral teeth tricuspid; ptery- 

 goid teeth present. No sternal fontanelle. Abdominal ribs. 



This genus is allied to Urostrophus^ D. & B., and Aniso- 

 hpisj Blgr., but differs from both in the absence of a gular 

 fold and in the dorsal lepidosis. 



Aptycliolcemus longicauda. 



Head rather small, body elongate. Nostril lateral, near 

 the end of the snout ; ear-opening small, suboval, oblique. 

 Upper head-scales rather small and smooth, smallest on the 

 supraocular region, largest on the snout ; occipital slightly 

 enlarged, larger than the ear-opening ; upper labials eight or 

 nine, very low. Anterior gular scales small, equal, granular, 

 keeled. Dorsal scales mostly hexagonal, strongly keeled, 

 forming about twelve longitudinal series, passing gradually 

 into the small granules which cover the sides. Ventral scales 

 much larger than dorsals, strongly keeled, shortly mucronate, 

 imbricate, in 16 to 18 longitudinal series ; the keels forming 

 straight longitudinal lines. The adpressed hind limb reaches 

 the shoulder, or halfway between the fore limb and the ear. 

 Tail at least three times as long as head and body, covered 



* The mandibles of the Discoglossidae and Pelobatidae differ from those 

 of all other European frojjs in the absence of sympliysial or mento- 

 mcckeliau bones. 



