PHOTOPHORES OF DECAPOD CRUSTACEA 



341 



Similarly the photogenic cells of the carapace organs bear at their basal ends small 

 hemispherical masses of a precisely similar granular material (Fig. 17, phot.c.b.c.) 

 showing the same staining reactions and having an equally intimate relation with the 



n.chit.eL 



Fig. 17. Part of a transverse section through the branchiostegite of Hoplophorus novae-zealandiae, showing 

 one of the lateral carapace photophores. The outer wall of the branchiostegite is on the left, the inner on the 

 right, and between them a haemocoelic blood space is indicated by mechanical stippling. A section through 

 a similar but more anterior organ appears in Plate XXV, fig. 2. In each the plane of section corresponds to 

 a section passing through ab in the whole view in Fig. 18. Fi.xed Duboscq, Delafield's haematoxylin and 

 eosin. cut. cuticle; haem. haemocoele; /. lens; n.chit.ep. nucleus of chitogenous epithelium; n.r.c. nucleus of 

 reflector cell ; phot.c.b.c. basal cap of photogenic cell ; phot.c.cl.a. clear area of photogenic cell ; n.phot.c. nucleus 

 of photogenic cell; phot.c.nv. fibres innervating photogenic cell; r.c.b. reflector cell body; vac. vacuoles in 

 reflector layer. 



5-2 



