Different Animals, Ee, 495 
thisplaced. The’ parietal bones and the upper 
part of the frontal bone were not wanting, as is 
generally the’ case “in acephalous ‘fetuses ; but 
they were very small and pressed down flat upon 
the base of the skull, so that there was no room 
for the brain. The superior portion of the 
Occipital bone was wanting and the canal -of the 
spine was incomplete, being open behind from 
the top of the neck down to thé os sacrum. 
The'spinous processes of ‘the vértebre were not 
wanting, but’ appeared as if divided and turned 
down on each side, so that 4 kind of spoon-like 
cavity was formed, which was deepest at the 
upper part, owing to the bodies of the cervical 
vertebra projecting forwards. In the upper part 
of this cavity the cerebellum was'lodged and the 
cerebrum extended down to the os sacrum. The 
“optic nerves arose from the base ‘of the brain 
pretty low down; they were consequently much 
elongated ; they were also much slenderer than 
usual, though the retina was as large: and pulpy _ 
as is natural. The spinal marrow was divided 
into two slender cords, which were disposed one 
‘on each side’ of the encephalon and. gave off 
their nerves as they descended. The nerves of 
the extremities were of the natural magnitude. 
The brain and spinal marrow had only a mem-., 
branous covering posteriorly, «This fetus was 
born dead, but not putrid; though born at thé 
VOL. Vv. rs 
