194 MARGARET R. HAASE. 



PLATE II. 



FIG. 4. Longitudinal section through a left ciliated pit. General body epithe- 

 lium (g.b.e.); transitory nucleus (t.); non-ciliated ridge (r.); sensory nucleus 

 (s.); pore of gland cell (p.); canaliculi (en.}; gland cell (g.); anterior nerve (a.n.); 

 nucleus of gland cell (g.n.); lateral muscle fiber (l.m.); X 1500. 



FIG. 5. Longitudinal section through a left ciliated pit, especially to show the 

 row of four sensory nuclei (s.); General body epithelium (g.b.e.); anterior nerve 

 (a.n.) ; secretion in pores of gland cell which lead into lumen of pit (se.) ; canaliculi 

 (en.); gland cell (g.); nucleus of gland cell (g.n.); X 1500. 



