THE F(Kii ft 



901 



covered by the peritoneum, and arrives at the liver, into which it enters and 



.Jims directly into the vena portte ; the junction of the two vessels giving 



U> a single canal from which proceed the hepatic veins. In other 



animals than Solipeds, this vessel gives off a particular trunk of somewhat 



Fig. 4-JS. 



A FCETU8 OPENED ON THE LEFT SIDE TO SHOW THE COURSE OF THE UMBILICAL 

 VESSELS IN THE BODY. 



vmmmul ui HIE, uvur. 



A, Umbilical cord ; B, Umbilical vein ; C, Umbilical artery ; D, 

 F, Kidney ; o, Spleen ; H, Liver ; I, Intestine ; j, Lung ; K, 

 artery ; M, Ductus arteriosus ; N, Thymus gland. 



, Bladder ; E, Testicle ; 

 Heart ; L, Pulmonary 



considerable volume, which passes directly to the posterior vena cava, 

 forming what is named the ductus venosua (Figs. 429, 430). 



Such are the umbilical vessels, and it will be seen that they form a part 

 of the circulatory system of the young creature which will be more com- 

 pletely studied hereafter. 



DIPFEBENTIAL CHAUACTEBS IN THE ANNEXES OF THE KBITS OF OTHER THAN SOLIPED 



MAL8. 



1. RUMINANTS. Placenta. The placental apparatus of the Cow is not uniformly 

 spread over the outer surface of the rhorion. but is ootMtituted by a varinl.lt- number of 

 vascular bodies, about sixty on an avem : ml' d here mi. I tin n-. an,! ,|,.\, tailed by 



reciprocal penetration of prominences ami cavities, into analogous bodies on tin- inner 

 surface of the uterus, designated cotyledon*. These r<- only ihick- n- .1 points of the 

 mucous membrane, the follicles of which are enormously mlanr-d. Tli--v r\ist, we have 

 seen, before gestation; but observation denxNUtrtie* that they may In- ai't- -rwar Is formed 

 <>r ntirely renewed, especially in those cases in which accidental circumstances have 

 1 those present insuhVient f>r tie ir olli.-e >t an- t'oimd in t .e bo l\ ,.f 



the uterus; in the cornua they are smaller as they are nearer the extremity. Their 

 form in generally elliptical, and they are attached to the uterine surface by a wide mucous 



