16 
Proceedings of the Royal Society of Edinburgh. [Sess. 
The Navel string had been torn across at the umbilicus and a few coils of 
intestine protruded through the aperture in the wall. The Genital opening 
was an antero-posterior slit, 5 mm. long. The Anal orifice, about 2 cm. behind 
the genital opening, was nearly circular, and admitted only a small probe. 
The Orbit was situated immediately above the angle of the mouth. 
The eyelids were thin folds, and as the palpebral fissure, directed antero- 
posteriorly, was narrow, only a small part of the eyeball was visible. The 
orifice of the Auditory Meatus was not seen, but a shallow pit, 15 mm. 
behind the palpebral fissure, might indicate its position, though it would 
not admit a hair bristle. 
The Buccal opening was 12 cm. (4'7 in.) long and 8 cm. (3T in.) wide 
at the angles. Narrow rudimentary folds represented the upper and lower 
lips. The Palate formed an elongated triangle ; it was grooved mesially 
and the mucous membrane at the sides of the groove was thick and some- 
what succulent. The Baleen plates had not as yet formed, and except faint 
transverse markings on the surface of the mucous membrane immediately 
behind the anterior end of the palate, no indications of the transverse folds 
of membrane, in connection with which the baleen plates are developed, 
could be seen. 
The Tongue was well formed and had a distinct dorsal median furrow, 
which widened into a fossa near the tip. It was movable within the 
mouth, for 2‘5 cm. at the anterior end ; the circumference of this part 
was surrounded by mucous membrane, which formed a shallow fraenum 
continuous with the membranous covering of the floor of the mouth. 
The sides of the tongue were also free, and at the part where the mucous 
coverino- was reflected on to the floor a well-marked raised band was 
present. The mucous lining of the floor of the mouth and of the sides 
of the tongue was grey, that of the dorsum linguae was greyish black and 
with distinct papillae. 
The Bucco-pharyngeal opening scarcely admitted the tip of the little 
finger. 
The Pectoral limb was narrow and short in relation to the size of the 
foetus, its length was 9 cm. (3'5 in.), the greatest breadth 2*8 cm. (1 in.), the 
surfaces were flattened ; the posterior border was faintly convex, the anterior 
slightly concavo-convex, but in the outer third of the limb they approximated 
so that the tip assumed a lance-shaped form. 
Colour . — As the cuticle was in place on the head and on a large part of 
the body, the natural colour of the foetus had doubtless been preserved. The 
prominence on the summit of the head and the dorsum of the body were 
black. At one spot the cuticle was loose and could be raised from the 
