THE ANATOMY OF THE INTERNAL UROGENI- 
TAL ORGANS OF CERTAIN NORTH 
AMERICAN LIZARDS.* 
BARNEY BROOKS, B. S. ## 
With Plates I-IY. 
It was suggested to me by Prof. Thos. H. Montgomery, Jr., under 
whose direction this work was done, to undertake the anatomical 
examination of the internal urogenital organs of lizards, because 
those of the American species are practically a terra incognita. 
The organs were dissected in both sexes in the following Texan 
species : 
Iguanidae. 
Sceloporus floridanus (Baird). 
Holbrookia texana (Girard). 
Phrynosoma cornutum (Harlan). 
Phrynosoma sp. 
Crotaphytus collaris (Say). 
C. wizlizenii (Baird and Girard). 
Scincidae. 
Eumeces guttulatus (Hallo well). 
Anguidae. 
Gerrhonotus infernalis (Weigmann). 
Teiidae. 
Cnemidophorus gularis (Baird and Girard). 
In none of the species here described have these organs been pre- 
viously examined, and of observations on distinctly American forms 
I know of only the papers of Cope (1900), which treats the internal 
organs quite summarily, and of Coe and Kunkle (1904) concerning 
the genus Anniella. The two common European species Lacerta 
viridis and L. vivipara have been well investigated, notably by Lere- 
boullet, Leydig and Braun. But otherwise the literature on these 
structures seems to be monographic rather than comparative, and is 
widely scattered in the journals so that much of it was inaccessible 
to me ; a list of it is given at the end of the present communication. 
* Contributions from the Zoological Laboratory of The University of Texas, 
No. 69. 
**Professor of Chemistry, Coronal Institute, San Marcos, Texas. 
