HAPLODONTID^E— VISCERA OF TTAPLODON 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 testes 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 otf 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 penis are plainly traceable to the tuberosity 

 of the ischium, fibres arising most of the way along the pubic as well as 

 ischiatic ramus. The preputial 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 sulcate; the basal extremity is emargin- 

 ate. The bone appears to continue to the very end of the organ, no glans 

 penis being evident. 



Muscles. — I add notes on a few of the muscles, as incidentally observed 

 during the examination of the viscera. 



