Tapayaxin.
The animal represented on the plate is the Tapayaxin of Hernandez, Phrynosoma orbicularis of Wiegmann, Tapaya orbicularis of Cuvier. The specimen from which it was drawn was entrusted to my care by my friend Richard Harlan, M. D., to whom it was presented by Mr Nuttall, who found it in California. A notice respecting this species by Dr Harlan will be found in the American Journal of Science and Arts, vol. xxxi.