PEROPUS MUTILATUS. 277 



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

 Fig. 8, abdominal scales, also slightly magnified. 



Genus PEROPUS, Wiegm. 



Gen. 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, Wiegm. Act. Acad. nat. cur. XVII, i, 1835, 238. — Dum. & 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 Geliyra, 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 Qeliyra 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. 



Syn.' — Peropus mutilatus, Wiegm. Act. Acad. nat. curios. XYII, i, 1835, 238. — 

 Gray, Catal. Lizz. Brit. Mus. 1845, 159.— Pitz. Syst. Kept. 1843, 103. 

 Hemidactt/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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