North American Lizards. 
25 
windings of the spermadnct near the extreme anterior ends of the 
testes. 
(b) female. (PI. I, Fig. 3.) 
The female examined was evidently not the same species as the 
male just described. 
In this form the ovaries (Ov.) lie close to the dorsal wall of the 
abdominal cavity. They are supported by two folds of peritoneum 
(N) ; the right one is somewhat anterior to the left. 
The oviducts (Ovd.) are tubes which begin some distance in front 
of the ovaries with a large slit like ostium (Os.). The ducts are 
very thin walled in this region and collapsible. Posteriorly they grad- 
ually become thicker walled and, after a few convolutions in the 
region of the anterior ends of the kidneys, they pass across these 
bodies and open into the cloaca by two distinctly separate openings. 
The kidneys of the female were slightly different from those of 
the male, but this was no doubt due to the fact that the two speci- 
mens were of slightly different species. The kidneys showed n©» 
signs of being divided into lobes, but each had a large notch in the 
side through which blood vessels passed. The two kidneys were als® 
closely applied to one another behind the anus, and there was a bridge 
of kidney substance which joined the two kidneys at about their 
middle point. But this bridge formation did not seem to be pres- 
ent in all of the specimens, and would therefore best be considered 
as an individual variation rather than a fixed structure. 
The ureters (Ur.) are practically the same as in the male, as far 
as branching out over the kidney is concerned. The ureterfe open into 
the cloaca just at the point where the oviducts terminate so that it 
is difficult to say whether they open into the cloaca or into the ovi- 
ducts. 
The adrenals (Ad.) are present as small yellow bodies lying in? 
the fold of the peritoneum which support the ovaries. 
2. Sceloporus floridanus. 
(a) male (PL IV., Fig. 15.) 
In Sceloporus floridanus the male genital organs are very sim- 
ilar in appearance to those of Holbrookia, as are the kidneys. Tte 
testes in Sceloporus are relatively larger and not so symmetrically 
placed in the abdominal cavity, and the windings of the spermaduefe 
are simpler. The animal dissected measured (snout to vent) 7cm. 
( The testes (T.) are relatively large, each measuring about 7mm,. 
by 5mm. The left one lies considerably more posterior than the rigM 
(about two-thirds of the left being entirely behind the right). The 
left testicle was invariably pigmented at the anterior pole over a zone 
