HAPLODONTIDA—VISCERA OF HAPLODON RUFUS. 589 
nearly opposite the last rib. The ureters pursue the usual course, to open at 
the side, near the base, of the urinary bladder, which is of large size. The 
kidneys are capped by well-developed adrenals, which are slender bodies, 
about half an inch long. 
In the condition observed, the ¢esfes are abdominal, lying in the large 
inguinal canal, not bulging beyond the general plane of the obliquus externus 
muscle, and consequently causing no visible swelling of external parts. There 
is no proper scrotal dilatation of the integument; though in the periodical 
increase in size, which the organs doubtless undergo, and their presumed 
descent some way through the inguinal ring, it is supposed the organs may 
“cause some turgidity of the exterior contour. The testes are enveloped in a 
conspicuous muscular tunic, an incompleted cremaster, given off from the 
transversalis abdominis. The body proper, in the state observed, is less than 
an inch in length, of narrowly oval shape, invested with a firm whitish 
tunica albuginea; but the organ has a long tapering prolongation upward, 
while at the lower extremity is the small mass of the epididymis. The vas 
deferens ascends the border of the testes part way before leaving the organ to 
pursue a nearly straight course to the urethra, where it empties close to 
its fellow, at the middle line of the large transverse gland, which embraces 
the base of the urethra posteriorly. 
The muscular crura of the pénzs are plainly traceable to the tuberosity 
of the ischium, fibres arising most of the way along the pubic as well as 
ischiatic ramus. The przeputial sheath of the penis is freely movable along 
the whole length of the os penis. This is of large size, and in the inactive 
state of the member is directed backward, causing the tegumentary invest- 
ment of the organ to project conspicuously, as already noted in describing the 
external parts of the animal. The bone is about an inch long (0.80 in 
the specimen examined), straight and flattened, widening regularly and gradu- 
ally from base to tip, where it is enlarged, with a clubbed and deeply bifid 
extremity; this end of the bone suggesting the condyles of a femur, though 
its cleft is much deeper. The dorsum is smoothly convex from side to side ; 
the urethral surface of the bone is suleate; the basal extremity is emargin- 
ate. The bone appears to continue to the very end of the organ, no gians 
penis being evident. - | 
Muscles—I add notes on a few of the muscles, as incidentally observed 
during the examination of the viscera. 
