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Show 1896.]' ON A NEW GECKO FROM PENANG. 767 8. On a new Gecko from Penang. By G. A. BOULENGER, F.R.S. [Eeceived June 16, 1896.] (Plate XXXVI.) Among some Reptiles and Batrachians collected on Penang hill (at 2200 feet altitude) by M r . Stanley Flower, and presented by him to the Natural History Museum, there was a new Gecko of particular interest. At a first glance it appears to be a Ptgchozoon, that curious form of parachute-bearing Geckos of which we now know two species from South-eastern Asia, viz., P. homalocephalum, Crev., and P. horsfieldil, Gray. But this resemblance is merely a case of convergence, for whilst Ptychozoon is a modified form of Gecko, the new lizard is clearly derived from Hemldactylus. The gap between the species referred to Gecko and those on which Ptychozoon is based is so considerable, that the latter genus has been universally accepted by modern herpetologists. But in the present case the matter is not quite so simple ; for we have long been acquainted with a species of Hemldactylus,-ff. platyurus, Schn.,-which, by the presence of a well-developed fold along the side, foreshadows the development of the parachute of Ptychozoon; however, the scaling on these membranes does not show any modification, and therefore I have thought it fit to found a new genus for the species described below, which differs in the brick-like enlarged scales covering the side-membranes, as well as in the greater development of these membranes and the fuller web between the digits. If Ptychozoon deserves to stand as distiuct from Gecko, it would be illogical not to allow the same rank to the new Penang Lizard. I therefore propose to name it Mimetozoon gioweri. MIMETOZOON, gen. nov. Digits extensively webbed, strongly dilated, with two rows of lamellaB beneath ; the two distal phalanges compressed and slender, rising from within the extremity of the dilated portion ; all the digits clawed. Limbs and sides of head, body, and tail with much-developed dermal expansions. Upper surfaces covered with juxtaposed granular scales and tubercles, the parachute-membrane covered above with imbricate tetragonal scales arranged like bricks. Pupil vertical. MIMETOZOON ELOWEJJI, sp. nov. (Plate XXXVI.) Head slightly distinct from neck; snout obtusely pointed,much longer than the distance between the eye and the ear-opening, |