PLATE XXIII. 



Fig. '27. Median longitudinal section of duet of poison gland, showing pro- 

 longation of funnel cell (p.Jt.e.), prolongation of muscles 

 (l>rol.m.f.) into the epidermis, and the c-onnective tissue (c.t.) 

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

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

 stain. X 1650 



Figs. 28, 29, 30. Cross sections of ducts, showing funnel cells (/.<.), gland 

 muscles (prnl.m.f.), connective tissue (c.t.) at sides of duct (</.), 

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

 conn, tissue stain. * 1650 



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

 (m.gl.) inside it. Large gland 440 microns by 180 microns; 

 small gland 90 microns by 43 microns. Mallory's conn, tissue 

 stain. X 1650 



Fig. ',12. Nerve-endings (n.e.) about nucleus of poison cell (WHO.;;. c.). Mal- 

 lory's conn, tissue stain. X 1650 



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