AND ON THE FCETUS OF THE DELPHINUS NESARNAK. 273 



DESCRIPTION OF THE PLATES. 

 PLATE XXXV. 



Fig. 1. A correct representation, full size, of the foetus with its umbilical cord ; to which is attached 

 a remaining part of the amnios. In opening the abdomen the urinary bladder was cut open, and a probe 

 passed along the urachus towards the allantois. 



Fig. 5. The alimentary organs, to which is attached a small remaining portion of the liver. « is a 

 thread passed into the bonnet, which communicates by a small aperature with the many-plus, in which is 

 seen a thread h, that passes through a valvular opening into the third stomach, or red, which is the rennet. 



c. The small intestine which has no cjecum nor colon. 



Fig. 3. A vertical view of the tongue glottis and lungs, a the tongue, b the glottis, which projects 

 through a narrow slit in a velum. The glottis seems to be capable of inhaling or expiring air above this 

 velum through the blow-hole when projected through the slit ; when withdrawn, it doubtless can drive the 

 air of the lungs out through the mouth, to expel any substances contained therein, that the animal may 

 have occasion to reject. 



Fig. 4. a. b. c. Show the same parts in profile. 



PLATE XXXVL 



Fig. 1. The two-horned womb of the Porpoise represented of full size, a the right, and b the left 

 uterus. The foetus was developed in the right cavity. 



c. A large probe passing from the right into the left womb, through an opening in the strong septum 

 between them. 



d. (I. d. Show the plicated or pleated arrangement of the internal membrane or surface of the wombs 

 which gives rise to a vast increase of the superficies or surface of contact. This surface with its 

 foldings is a true caduca. 



e. The vagina. 



/. The OS uteri with its pleated surface. 



g. The cervix uteri incised longitudinally. 



h. h. h. The chorion, which was left in the wombs, though much broken. The figure serves to show 

 how its external or uterine aspect, being folded or pleated like the inner aspect of the wombs, gave rise to 

 a vast multiplication of surface of contact and aeration. 



i. The ovary split open. 



Fig, 2. a the inner os tincse not yet cut open ; b the outer or lower os tinea open and strained out to 

 show its folds, and the manner in which the upper surface is invaginated in the lower one ; c the vagina ; 

 d the canal of the cervix uteri. 



Fig. 3. Section of a portion of the womb magnified, but giving a good idea of the pleated surface or 

 decidua at a, while b shows the muscular or fleshy substance on which the deciduous coat is developed. 



