182 



MUSCULAR SYSTEM. 



I have not been able to devote any of the specimens as yet 

 examined to a detailed examination of the muscular system, nor 

 indeed were any, except one which I have been anxious to pre- 

 serve, as nearly as possible, intact for future reference, in a very 

 suitable condition for a careful investigation of the soft parts ; 

 but generally speaking the muscular system is very well developed, 

 especially on the limbs, pectoral, dorsal and caudal regions. A 

 large mass of nuchal muscles, sho^vm by the dotted line (I) in PI. Y., 

 fig. 1, passes from the trunk and reaches to the summit of the 

 occipital region for insertion into the triple ridge described on 

 the posterior part of the vertex of the skull. This muscular 

 mass contributes materially to the obliteration of the neck that 

 has been alluded to. 



URINARY AND GENERATIYE ORGANS. 

 (PI. IX., figs. 5 and 6.) 



The long, straight and wide rectum, lying in the middle line 

 of the body, opens into a cloaca, which receives, also, the genito- 

 urinary products. The anal aperture of this is surrounded with 

 long straight hairs. The urinary bladder, considerably elongated 

 and narrowing from the fundus, lies on, and ventral to, the rectum, 

 and into its posterior narrow extremity the ureters and vasa 

 deferentia open close together, but the former are dorsal to the 

 latter. From the bladder the first portion of the urethra passes 

 posteriorly as a straight tube of considerable length, and then 

 enters the posterior end of the penis, in which, with ordinary 

 dissection, I was unable to distinguish separate spongy and caver- 

 nous portions. This organ shows at its root two divergent 

 bulbs, which, coalescing into a single cylindrical body, passes 

 backwards, lying on, and closely adherent to, the ventral surface 

 of the rectal wall. Posteriorly, the penis terminates in a 

 single-pointed extremity, which pierces, as it were, the cloaca, 

 and when this is laid open the tip just appears lying retracted 

 within a^recess in its wall, which thus forms for it a sort of preputial 

 sheath (fig. 6) ; out of this recess the organ can be drawn con- 

 siderably. On the dorsal aspect of the point of the penis is the 

 slit-like anterior orifice of the urethra, which thus perforates the 

 whole length of the organ. 



The testes are oval bodies, which lie between the muscular 

 planes of the abdomen in a position corresponding to the anterior 

 edge of the pubic symphysis ; they are therefore prepenial. In 

 the specimens before me there is no trace of an external scrotum, 

 and the organ can scarcely be felt by careful examination from 

 the outside of the body. In the notes forwarded to me by Mr. 



