82 Trans. Acad. Sci. of St. Louis. 



4. Aromochelys tristycha Agz. — A musk turtle. 



About a month ago Mr. H. N. Force, Ph. G., sent me 

 quite a collection of reptiles from Ozark County, and amongst 

 them I found one half-grown specimen of this variety. 

 Professor Louis Agassiz, in his monograph on turtles, 1857, 

 mentions specimens that were sent to him by Mr. G. Stolley 

 from the Osage River, in Missouri. Agassiz writes: "Al- 

 though Ozotheca odorata, its eastern congener, varies greatly 

 not only in color but even in outline, I have no doubt that 

 this is a distinct species characterized when young by the 

 great prominence of the keels upon the vertebral and costal 

 plates and by numerous dark dots between the scales of 

 the sternum, and when adult by a marked difference in the 

 form of the snout. In Ozotheca odorata the snout is much 

 more prominent on account of the slope of the upper jaw, 

 which extends further back and is therefore less steep than 

 in 0. tristycha, the lower jaw of which is broader below 

 the symphysis than in odorata, and suddenly turned up." 



Order Squamata. 



Suborder Sauria. 



Lizards. 



Iguanidae. 



1. Phrynosoma cornutum Harlan. — Commonly called 

 " horned toad." 



Mr: H. Q. Taylor, a resident of St. Louis, informed me 

 that he captured a specimen on the sandy river shore 

 opposite Leavenworth, in Missouri. Through advertising in 

 the papers, I received letters from gentlemen stating that 

 this animal had been caught in the streets of their respective 

 places but all these seem to have been escaped specimens and 

 were thus caught. The only authentic record of this lizard, 

 as occurring in the State, I find in the United States National 

 Museum reports by Dr. E. D. Cope, Crocodilians, Lizards and 

 Snakes of North America, on page 436 under No. 17397-99 : — 

 three specimens collected by C. W. Richmond in South- 

 western Missouri. 



