PEROPUS MUTILATUS. 277 



Fig. 7, granulation of the back, somewhat magnified. 

 Fig. 8, abdominal scales, also slightly magnified. 



GENUS PEROPUS, WIEGM. 



GEX. CHAR. Pupil vertical. Fingers and toes slightly palmated, 

 dilated upon their extremity, with transverse plates beneath, 

 divided by a mesial groove. Thumbs clawless. Back covered with 

 small, granular scales. Femoral pores present. Tail depressed, 

 provided with small scales beneath. 



SYN. Peropus, TViEGM. Act. Acad. nat. car. XVII, i, 1835, 238. BUM. & BIBR. 

 Erpet. gen. Ill, 1836, 350. GRAY, Catal. Lizz. Brit. Mus. 1845, 159. FITZ. Syst. 

 Kept, 1843, 103. 



OBSERV. The chief difference between this genus and Gehyrn, con- 

 sists in the structure of the subdigital plates, which are divided by a 

 mesial groove, and obliquely disposed upon each half of the disk, so 

 as to assume a fanlike aspect. The tail itself is flattened or depressed, 

 whilst in Geliyra it is nearly cylindrical. As to the presence or absence 

 of a membrane uniting partially the toes at their base, it may be met 

 with in both genera. 



1. PEROPUS MUTILATUS, Wiegm. 



SPEC. CHAR. Eyes moderate. Mental shields rather large and poly- 

 gonal. Tail laterally subserrated. Grey above, with small brown- 

 ish spots. Beneath whitish. 



X. Peropus nnttilatus, WIEGM. Act. Acad. nat. curios. XVII, r, 1835, 238. 

 GRAY, Catal. Lizz. Brit. Mus. 1845, 159. FITZ. Syst. Kept. 1843, 103. 

 ffemidaclt/lus mutilatus, DUM. & BIBR. Erpet. gen. Ill, 1836, 354. 



OBSERV. A specimen of this species, answering to the description 

 of the authors quoted above, was collected while the squadron explored 

 the Balabac Strait. It is two and two-thirds of an inch long, the 

 tail forming about the half of that length, in which the head enters 



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