PLATE XXIII. 



Pig. 'J7. — Median longitudinal section of duet of poison gland, showing pro- 

 longation of funnel cell (p.fl.c), prolongation of muscles 

 (prol.m.f.) int<> the epidermis, and the connective tissue (c.t.) 

 outside them. Replacement cells (rep.c.) shewn with processes 

 extending down as far as funnel cell. Mallory's conn, tissue 

 stain. 1650 



Pigs. 28, 'J!'. 30.— Cross sections of ducts, showing funnel cells I (I.e.), gland 

 muscles [prol.m.f. ). connective tissue (c.t.) at sides of duct (d.), 



and constrictor and dilator muscles [con.m, dil.m.). Mallory's 

 conn, tissue stain. 1650 



Fig. 31. — Longitudinal section of poison gland, showing small mucus gland 

 (nt. (/I.) inside it. Large gland 440 microns by 180 microns; 

 small gland 90 microns by 4)i microns. Mallory's conn, tissue 

 stain. L650 



Fiu-. 32. — Nerve-endings (n.e.) about nucleus of poison cell (nue.p.c). Mal- 

 lory's conn, tissue stain. 1650 



