DESCRIPTION OF FIGURES. 
The 1 1 figures presented in illustration of this paper were drawn for me by Mr. 
George T. Kline, biological artist of the University of Missouri, to whom I am indebted 
for skill and painstaking care in the interpretation of the specimens represented. 
LIST OF ABBREVIATIONS USED. 
Bl. V Blood vessel. 
Col. ep Columnar epithelium. 
Fat vac Fat vacuoles. 
Cast, gl Gastric glands. 
Goblet c Goblet cell. 
M. circ Muscularis circularis. 
M. long Muscularis longitudinalis, 
M. muc Muscularis mucosa. 
Neck c Neck cells. 
Str. comp Stratum compactum 
Str. gran Stratum granulosum 
Submu Submucosa. 
Tu. pr Tunica propria. 
Wh. corp White corpuscle. 
Pl.vte XXV. 
Fig. I. — This outline figure of the adult salmon is presented especially to show the external appear- 
ance of the viscera and the space relations of its parts. A segment of the left ventral wall is removed, 
exposing the organs in their natural position. The drawing is a semitransparency. The parts to which 
special attention is called are : 
1. The liver, filling the anterior portion of the body cavity. 
2. The cardiac loop of the stomach. The index figure is placed over the anterior portion of the 
posterior limb of the intestine shown as a transparency through the thickness of the stomach. 
3. The pyloric limb of the stomach. The numeral is placed over the extreme anterior end and 
very near the constriction which is the location of the pyloric valve. 
4. The pyloric intestine. 
4^. The extreme posterior end of the intestine. 
5. The pyloric cseca. 
5'. Marks a caecum that is almost surrounded by pancreas. 
6. Pancreatic gland. 
7. The spleen. 
8. The long strap-like testes. 
9. The ventricle. 
Note that tlie pancreas is of the diffuse type of gland and is attached to the surfaces of, and lying 
among, the pyloric cseca. The gland is omitted over the caeca of the anterior loop. One-fourth natural 
size. 
Plate XXVI. 
Fig. 2. — Cross section of a normal empty stomach from salmon no. 21, Monterey, Cal. This low- 
power figure shows the relation of the gross parts, also the compact folding of the glandular portion of 
the stomach into longitudinal mgs when it is empty. Magnification, X4- 
Fig. 3.^ — A low-power drawing of a transverse section of the stomach wall, showing the histological 
relations of the various coats. For the interpretation of the abbreviations used to designate the parts, 
refer to the list of abbreviations above. Camera outlines. Magnification, Leitz ocular i, objective 3. 
Fig. 4. — A representation of a highly magnified gastric gland. To the left of the figure are three 
transverse sections of the gland tubes, one showing a deep oval. To the right of the figure is a longitu- 
dinal section of a short loop of gland cells just at the point where transition to neck cells takes place. 
The gastric-gland cells are loaded with granules from base to free margin. The granules vary consider- 
ably in size, as discussed in the text. The neck cells are free of granules. Camera lucida outlines. 
Magnification, Leitz ocular 2, objective 1/12. 
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