md.org. 



Fig. 7. Transverse section through the base of the mandible and mandibular organ of Parapandahis 

 richardi at the level of the arrow in Fig. 6. Fixed Duboscq, Delafield's haematoxylin and eosin. l.c.n.iK non- 

 vacuolated liver cell; lum.l. lumen of liver tubule; md. mandible; md.ni. muscle of mandible; md.org. mandi- 

 bular organ ; phot.c. photogenic cell. 



n.lc.n.v. 



50l 



d.chit 



Fig. 8. Enlarged view of the photogenic region of the liver of Parapandalus richardi seen on the lower left 

 side of Fig. 7. The liver tubules illustrated are cut obliquely transversely at some distance from their tips 

 at the junction of the two zones of cells described in the text, fib.t. fibrous tunic of organ; l.c.ti.v. non- 

 vacuolated liver cell; /.«. lenticular nucleus; Iimi.l. lumen of liver; rnd.chit. chitin of mandible; n.l.c.n.v. 

 nucleus of non-vacuolated liver cell; n. phot.c. nucleus of photogenic cell; phot.c. photogenic cell. 



3-2 



