280 



THE VOYAGE OF H.M.S. CHALLENGER. 



in Pachi/sfomias microdon. 



12. Suborbital organs witb reflector, 

 o. Distribution, 

 1). Structure, 



( 1 ) General, 



(2) Special description of the mborhital urgam 



a. General appearance, . 

 p. The smaller anterior organ, 

 y. The larger posterior organ, 

 c. Innervation, 



(1) hi general, . 



(2) The brain of Eehiostoma barbatum 

 il. FuiirAion, 

 e. Denelopment, 



CONCLUSION, 



a. Comparison of the different phosphorescent organs of Hslies, 

 h. The typical phosphorescent cells, 

 r. The phosphorescent organs of fishes compared with those of some other animals, 

 Scheme of the development of phosphorescent organs, 



EXPLANATION OF PLATES, .... 

 Key to the figures on the Plates, . 



PAGE 



.•519 

 319 

 320 

 320 

 .S20 

 320 

 320 

 322 

 322 

 322 

 322 

 323 

 323 



323 

 323 



324 

 32.'J 

 327 



328 

 328 



