374 



PROr. M. WA.TSON AND DR. A. H. YOUNG ON 



Laetnx and Cieculatoey Organs. 



The Larynx (PL YI. fig. 5), as will be seen by a reference to the 

 accompanying sketch, in its outward features resembles that of 

 the CervidsB in general. With regard to its cartilages, these 

 have been already described and figured by Professor Owen*. 



The Heart is small, and does not diff'er in respect of form from 

 that of most Euminants. Its cavities and valves are arranged 

 in the usual manner. The trunk of the aorta divides, as in other 

 Buminants, into two, anterior and posterior. The "anterior 

 aorta" passes forwards to be distributed to the headj^neck, and 

 fore limbs ; whilst the " posterior aorta" supplies the trunk and 

 posterior extremities. 



Ueinaey and Geneeative Oegans. 



Kidney. — This is smooth and non-lobulated, a fact previously 

 observed by Perrault (loc. cit.). The uriuiferous tubules open, not 

 on separate papillse, but upon a single elongated ridge. In this 

 respect the Elk agrees with the larger Cervidae. 



Testicle and Accessory Parts (PL YII. fig. 6). — The testicle 

 (a, a) is of the usual form, and is provided with a well-marked 

 epididymis. The scrotum is non-pendalous. The vas deferens 

 (J, h) measures 18 inches in length, and is slightly dilated at its 

 entrance into the urethra. Before passing through the wall of 

 this canal, the two vasa are closely applied to one another ; they 

 terminate on the floor of the urethra in a manner to be presently 

 described. Connected with the posterior extremity of each vas 

 deferens, previous to its passage through the urethral wall, is a 

 small vesicula seminalis (c, c), which measures 1^ inch in length. 

 It is placed along the outer side of the corresponding vas, and is 

 uncovered by muscular fibres. Each unites with the vas of the 

 same side to form the ejaculatory duct. 



Lying between the bladder and rectum is a well-marked fold of 

 peritoneum, which consists of two layers, one of which is refiected 

 from the lower aspect of the rectum, and the other from the upper 

 surface of the bladder to become continuous at the free margin of 

 the fold, which is directed forwards. Lying between the laminae 

 of this fold are the two vasa deferentia and a well-marked vesicula 

 prostatica. The former extend from without -inwards, lying in 

 the free margin of the fold, and, having reached the middle line, 

 * ' Comparative Anatomy of Vertebrates,' vol. iii. p. 694. 



