106 B. G. Wilder on a foetal Manatee and Cetacean. 
outer curves of the head, trunk and tail. But while we may 
fee] sure that the truth lies between these two extremes, it is 
not easy to decide upon the points which should be traversed by 
a straight line representing the total length. The measurements 
here given may therefore be regarded as only approximately 
true to nature, 
described by the same author (1, 133). ; 
e ubdomen is closed but the umbilicus is large, ‘004 in 
diameter. The umbilical cord is not present, but there projects 
a loop of intestine about ‘040 long, together with a delicate 
membraueous tube which is apparently connected with the in- 
testine and is probably the remains of the yolk sack. (This 
will be fully described when the dissection is made). 
_ The clitoris is large, 003,2 in length. By its caudal deflec- 
tion it covers the genital and anal orifices. 
The brain was softened and its parts hardly distinguishable. 
It will be described hereafter. (‘The photograph was taken 
after its removal by a longitudinal incision). The extent of the 
cavity 1s approximately indicated by the dotted line. 
There is no external ear, and the orifice of the auditory mea- 
tus is a minute round hole* with wrinkled borders as in the. 
adult. A pigmentary deposit in the surrounding skin is all 
that can be seen by the unaided eye. The skull is prominent 
at this point, as shown in fig. 4. 
he upper and lower eyelids are separated by an elliptical 
opening, the long axis of which is oblique to that of the head. 
Its length is is -001,2. The third eyelid, if it exists, does not 
appear. By blowing between the lids there is revealed a space 
surroundings the orifice about ‘004 inch diameter; how far this 
represents the size of the globe can only be known by dissec- 
on. 
The nostrils have the same form as in the adult, but owing 
to the squareness of the muzzle, they do not appear upon a front 
view. 
anteve triangular pinna. t proves to exist upon only 
bly been produced artificially. Its position is just behind that of the meatus, and 
it closely resembles the early stage of the pinna in swine. 
