220 A. GtJNTHEE ON SOME EAEE EEPTILES 



Iguana. Metopocems. 



millim. niillim. 



Fourth metacarpal 17 16 



Fourth finger, first phalanx 9 6 



Fourth finger, second phalanx 8 6 



Fourth finger, third phalanx 9 5 



Fourth finger, fourth phalanx 10 6 



Fifth metacarpal 10 10 



Fifth finger, first phalanx ...... 9 7 



Fifth finger, second phalanx 11 7 



Femur 68 60 



Tibia 53 52 



First metatarsal 18 17 



First toe, first phalanx 14 10 



Second metatarsal 25 23 



Second toe, first phalanx 13 10 



Second toe, second phalanx 13 9 



Third metatai'sal 32 30 



Third toe, first phalanx 14 11 



Third toe, second phalanx 13 8 



Third toe, third phalanx 15 8 



Fourth metatarsal 36 33 



Fourth toe, first phalanx 18 15 



Fourth toe, second phalanx 15 10 



Fourth toe, third phalanx 14 9 



Fourth toe, fourth phalanx 14 9 



Fifth metatarsal 15 13 



Fifth toe, first phalanx 12 10 



Fifth toe, second phalanx 13 10 



Fifth toe, third phalanx 15 6 



It is obvious from a consideration of these measurements that the limbs of Metopo- 

 reros are considerably shorter than those of Iguana, therefore that its habits are much 

 less arboreal. Probably it lives on rocks near the sea-shoi-e, and has assumed a black 

 coloration, like other reptiles inhabiting similar localities. 



The shortening of the limbs is conspicuous in the humerus and femur, less so in the 

 bones of the forearm and lower leg, but most in the distal boues of the fore and hind 

 feet, which are comparatively much more shortened than the proximal. 



The largest specimen received by the Society was 44 inches long, of which the trunk 

 and head measured 18 inches. 



