196 MARGARET R. HAASE. 



PLATE III. 



FIG. 6. Oblique-longitudinal section through right ciliated pit especially to 

 show the three mesial muscle fibers (m.m.) ; associated with the ciliated pits. 

 Sensory nucleus (5.) ; transitory nucleus (/.) ; pores of gland cell (p.) ; canaliculi 

 (en.); gland cell (g.); anterior nerve (a.n.); non-ciliated ridge (r.); X 1800. 



FIG. 7. Diagrammatic reconstruction of lateral aspect of right pit. General 

 body epithelium (g.b.e.) ; transitory nuclei (/.) ; mesial application of anterior nerve 

 (a.n.); sensory nucleus (5.); pores of gland cell (p.); emptying into lumen of pit; 

 canaliculi (en.); gland cell (g.); bent, ovate nucleus of gland cell (g.n.); lateral 

 muscles of will of pit (l.m.) : mesial muscles of wall of pit (m.m.) ; X 2000. 



