PLATE LXXIT. 



Figs. 34-41. Opontomicut mirripmis. 



Hg. 34. Median section of a lenticulnr white dorsal pliosphorescent organ, x 80. 



Fig. 3.'>. Median section of another lenticular organ, showing incipient fission, x 80. 



Fig. 36. Transverse section of the distal part of tlie anterior ray nf the, pectoral fm, which is ])i-olonged 

 to fomi a barbel. x 100. 



Fig. 37. Median section of a hemispherical white dorsal phosphorescent organ, x 80. 



Fig. 38. Median section of a black dorsal phosphorescent organ, x 80. 



Fig. 39. Head in profile, from a spirit specimen ; natural size. 



", Dorsal phosphorescent oigans (simple) ; h, superior lateral line of compound phosphorescent organs ; 

 c, inferior lateral line of compound phosphorescent org.ins ; <?, suborbital phosphorescent organ : 

 t, barbel attachel to lower jaw ; /, barbels formed by the first ray of the pectoral fins. 



Fig. 40. Longitudinal section of the suborbital phosphorescent organ. x 100. 



a. Outer skin ; b, external radially .striped jiart : c, gland-tubes : rf. nervus phosphoriiis. 



Fig. 41. Section of the suborbital phosphorescent organ. Portion of the external radially striped part, 

 shown in fig. 40. x 800. 



a, Gland-tubes of the interior ; b, membrane dividing the outer layer from the inner glandular jiart ; 



f, layer of ganglion colls ; if, phosphnresoent cells: r. long and slender cylindrical supporting cells 

 between theni : /. outer siirfacc. 



Fig. 42. Eehiostnma harhafnm. 



Fig. 42. The brain in profile. x 4. 



<i, Spinal cord : b, and c, cerebral nerves ; '/, ner\nis acusticus ; e, ner\tis trigeminus ; /, nervus facialis 



g, nervus phosphorus (part of the trigeminus) : h, nervus oculomotorius ; A', nervus opticus; i. 

 nervus olfactorius : k, cerebellum; I, lobus opticus ; m, lobns phosphorius. 



Figs. 4;?. 44. Sropehis hi^witi. 



Fig. 4;i. Vertical section of the single compound dorsal phosphorescent organ shown in tig. 44. 

 X 1000. 



n. Ijong and -slender jKiluncle of the phosphorescent cell ; b, nucleus of the phosphorescent cell ; c, larf^ 

 oval vacuole outside the nucleus ; rf, slender cylindrical supporting cells ; e, granulai' cells with 

 indistinct outlines(ganglion cells); /, very ilistinct nuclei of the pinglion cells; j.onter surface clothed 

 »nth flat epithelium. 



Fig. -14. \'ertical section of the exposed ]wrt of tlio .single compound ilorsal phosphorescent organ. 

 X 80. 



", Outer surface with flat epithelial cells; h, granular mass of ganf;liou cells, with distinct nuclei; r. 

 phosphorescent cells ; rf, reflecting layer of spicules ; e, blood-vessels extending up into the masses of 

 phosphorescent cells ; /, nerves extending downwards from the external ganglion cell layer ; y, layer 

 of tissue with numerous bloo<lvessels; A, pigment coat. 



