PLATE XXV 



Fig. I . One of the pleopod photophores of Hoplophoriis novae-zealandiae. 

 Compare with Fig. lo. Fixed Duboscq, Delafield's haematoxylin 

 and eosin. x 240. f.r. fibrous reflector ; gr.z. granular zone at 

 bases of photogenic cells ; phot.c.d.a. clear area of photogenic cell ; 

 phot.l.m.a. attachment of longitudinal photophore muscle; phot.m.l. 

 photophore muscle loop; phot.nv. photophore nerve. 



Fig. 2. Lateral carapace photophore of Hoplophorus novae-zealandiae 

 in transverse section. Compare with Fig. 17. Fixed Duboscq, 

 Delafield's haematoxylin and eosin. x 240. b.v. blood vessel; 

 /. lens ; n.chit.ep. nucleus of chitogenous epithelium ; n.r.c. nucleus 

 of reflector cell; phot.c.d.a. clear area of photogenic cell; n.phot.c. 

 nucleus of photogenic cell ; phot.c.nv. nerve fibres to photogenic 

 cell, r.c.b. reflector cell body. 



Fig. 3. Longitudinal section through the right fifth thoracic limb of 

 Hoplophorus novae-zealandiae, showing the photophore at the 

 proximal end of the carpus. Compare with Fig. 14. Fixed Duboscq, 

 Delafield's haematoxylin and eosin. x 240. c.b. central body; 

 l.nv. main trunk of nerve to limb; n.r.c. nucleus of reflector cell; 

 phot.c. I, phot.c. 2, phases in the appearance of the photogenic cells; 

 phot.nv. nerve branch to photophore. 



Fig. 4. The photophore on the carpus of the fifth thoracic limb of 

 Systellaspis affinis, seen in longitudinal section by dark-ground 

 illumination, to show the nature of the white granular deposit. 

 Compare with Figs. 26 and 27 and Plate XXVI, figs. 3-6. x 80. 

 phot.u. one of the photogenic units ("rosettes"). 



Fig. 5. The distal photophore (streak) on the propodus of the fifth 

 thoracic limb of Systellaspis affinis, seen in longitudinal section 

 by dark-ground illumination, x 80. phot.u. one of the photogenic 

 units ("rosettes"). 



