562 DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 
d. Intestines.—The small intestines have a nearly uniform calibre throughout their 
entire course; the average diameter is three quarters of an inch. From the pyloric 
extremity of the stomach to the ileo-czecal valve they have a length of 60 feet 
2+ inches. : 
Excepting the curve of the gut as it passes round the head of the pancreas, which 
may be arbitrarily termed the duodenum, there is no definite change in the character 
of the internal mucous membrane sufficient to limit the above as it passes on to the so- 
called jejunum. In like manner, excepting greater frequency of Peyer’s patches, no 
line of demarcation exists between the jejunum and ileum. No valvule conniventes 
are present. The mucous lining of the whole of the small intestines ordinarily appears 
to the eye as smooth; but looked at more closely, and especially under water, the 
membrane is seen to be of a velvety or minutely villous character. The villi are 
arranged in transverse linear folds of a very delicate kind. 
At. the distance of 22 feet from the pyloric orifice the first Peyer’s patch is found. 
It is 3 inches long and about 0:7 inch broad. Fourteen feet further on another patch 
of Peyer’s glands is met with, which measures 7 inches in length, with a rather greater 
breadth than the first patch. The third agminated gland is 5 feet 10 inches apart from 
the second, and like it is broadish, but 5} inches long. A very considerable interspace 
then follows, apparently free from these glands. Eleven inches backwards from the 
ileo-ceecal valve there terminates an extraordinary long and continuous Peyer’s gland. 
This enormous gland, or lengthened group of Peyer’s vesicles, measures 4 feet 8 inches 
from the one extremity to the other. It varies in breadth from 0-5 to 0°8 inch, and in 
some places the vesicles or pits are more distinct than in others, but throughout its 
whole extent is well marked. - 
The caput cecum coli is a simple, wide, cylindroid diverticulum, half an inch long. 
The great intestine has few flexures; and its walls are remarkably free from saccula- 
tions. From the ileo-cecal valve to the anus it measures 59} inches, including cecum. 
The diameter of the greater part of its course is 1} inch, widening near the rectum 
to 1}inch. Mucous, muscular, and serous coats are each and all of considerable thick- 
ness. As may be inferred from the absence of sacculations, the longitudinal muscular 
fibres are not segregated in bands, but form a more or less uniformly distributed outer 
coat, thickest at the rectal portion, and terminating with the circular fibres in a large 
sphincter ani internus. The mucous folds are irregular slight elevations and shallow 
depressions, which only acquire a pronounced character at the lower part of the gut. 
The surface throughout has a minutely granulated appearance. 
From what has been said it follows that the total length of the alimentary 
tract (that is, from the mouth to anus) is approximately equivalent to 69 feet: of 
this the cesophagus counts 223 inches, the stomach 21 inches, and the intestinal tube 
65 feet 2 inches. 
