444 



1) The superficial epithelium (Fig. 2) is precisely like that found 

 in most fish stomachs— long cylindrical or columnar cells with oval 

 nuclei about the middle of the cell. Where they are best developed, 



z.ep. 



art. 



Fig. 2. 



c.t. 



.*i)2;'1f 





— s.ei). 





— - C. i. 



Fig. 3. 





-J" A, 



-■'C^~- ' veil. 

 . . - c. «. 



inl.cp. ■- 



:*v:;<»;*ir^^ 







c. l.n. 



cap. 



r. b. c 



c. Lf. 



Description of the Figures. 



The following letters are used to indicate the same structures throughout. 



ser. serous coat; m. long. longitudinal muscular coat; m. circ. circular muscular 

 coat; m. m. muscularis mucosae; c. t. connective tissue; c. t. f. connective tissue fibre; 

 c. t. n. connective tissue nucleus; «. c. stratum compactum; b.v. blood vessel; art. artery; 

 ven. vein; cap. capillary; r. b. c. red blood-corpuscle; I. leucocyte; eos. I. eosinophile 

 leucocyte; muc. mucosa; «. muc. submucosa; ep. m, epithelial part of mucous membrane; 

 s. ep. superficial epithelium ; int. ep. intermediate epithelium ; z. ep. zymin-secreting epi- 

 thelium; z. gr. zymogen granules; col. ep. columnar epithelium; ch. c. chalice cell; 

 deg. ep. degenerated epithelium; p. d, pancreatic duct; ft. fat. 



The figures are drawings by the author. The outlines were in all cases filled in 

 with Zeiß's camera lucida. For Figs. 2, 3, 4, 9 — 12 the objective was Zeiß homog. immers. 

 apochr. 2,0 mm apert. 1,40 with compensat, ocular 8, and the magnification is there- 

 fore X 1000; for Figs. 6, 7, the same objective with comp, ocular 4, magnification 

 X Ö00; for Fig. 1 Zeiß DD. with ocular 2, magnification about X 200; for Figs. 5, 8 

 Leitz 3 with ocular 4, magnification about X ^^^ 



Fig. 1. Stomach of salmon from mouth of river, to show normal arrangement. 

 Hsematoxylin and eosin. 



Fig. 2. Superficial epithelium of stomach (estuary salmon). Iron-h«matoxylin. 



Fig. 3, Junction of intermediate and zymin-secreting epithelium from gastric gland 

 (estuary salmon). Iron-hsematoxylin. 



