1873.] DR. A. GUNTHER ON REPTILES AND BATRACHIANS. 165 



unconditionally, in some of our latest and largest books of microgra- 

 phic and comparative anatomy, and without any reference to the 

 eminent physiologist who originally propounded it, the present mea- 

 surements are at variance with Wagner's conclusion. Indeed it 

 was as much nullified by Van der Hoeven's discovery, in the year 

 1841, of the large size of the corpuscles in Cryptobranchus, and by 

 the proof much later of their still greater magnitude in Amphiuma, 

 both species with evanescent gills. As little relation appears between 

 the size of the species and the size of the corpuscles ; for these are 

 larger in the little Proteus and Amphiuma than in the gigantic 

 Sieboldia. And this accords with my old measurements, which, 

 while proving that there is such a relation in one and the same order 

 of mammalia and birds, showed that the same rule is not applicable 

 to the lower Pyrensematous Vertebrates. 



3. Notes on some Reptiles and Batrachians obtained by Dr. 

 Adolf Bernhard Meyer in Celebes and the Philippine Is- 

 lands. By Dr. A. Gunther, F.R.S., F.Z.S. 



[Eeceived December 11, 1872.] 

 (Plates XVII., XVIII.) 



Hydrosaurus. 



In Proc. Zool. Soc. 1872, p. 145, pis. 7 & 8, I have described 

 and figured two species of Hydrosaurus from the Philippines ; but 

 , the exact habitat was known of one of them only. I am now able 

 to give more precise information in this respect. 



1. Hydrosaurus marmoratus is described by Cuvier and Wieg- 

 manu as coming from Manila. A fine specimen was obtained by 

 Dr. Meyer in Luzon, so that this species appears to be confined to 

 this island. 



2. Hydrosaurus nuchalis is from Negros ; several specimens of 

 different ages were brought by Dr. Meyer ; another we have bought 

 of Hrn. Salmin, all showing the peculiar development of the nuchal 

 scales. 



3. Hydrosaurus cumingii from Mindanao is still represented by 

 one example only. 



Tropidophorus grayi. 



One specimen was obtained by Dr. Meyer in Luzon ; and at a 

 somewhat later period we purchased three other examples of dif- 

 ferent ages of Hrn. Salmin, without precise information as regards 

 their habitat. All these specimens differ slightly from the typical 

 examples in having smaller gular scales. 



Hinulia variegata. (Plate XVII. fig. B.) 



This species has been very properly distinguished by Prof. Peters 

 from Hinulia navia, which has smaller scales, and the vertical sepa- 



