Plate 9. 



Figs. 43-46. Chauliodus barbatus Garman. 



Fig. 43. Axial section vertical to tlie median plane of the fish throngh a regular simple 

 radiating organ witli pigment slieatlj. Stained : haematoxylin-picric acid-fiiehsin. 

 Drawing; magnified 1: 280. c, connective-tissue membrane forming the cover- 

 ing of the mass of radiating cells on the outer side ; h, outer apparently struct- 

 ureless covering of organ; 1, central mass of polyedrical cells; m, granular 

 protoplasmic mass at the base of the organ ; p, pigment sheath ; pc, peripheral 

 cylindrical radiating cells. 



Fig. 44. Axial section vertical to the me<lian plane of the fish through an irregular simple 

 radiating organ with pigment sheath. Stained : haematoxylin-picric acid-fuchsin. 

 Drawing ; magnified 1 : 280. c, connective-tissue membrane forming the cover- 

 ing of the mass of radiating cells on the outer side ; h, outer, apparently 

 structureless covering of organ; 1, central mass of polyedrical cells ; m, gran- 

 ular protoplasmatic mass at the base of the organ ; yi, pigment sheath ; pc, 

 peripheral cylindrical radiating cells. 



Fig. 45. Axi.al section vertical to the median plane of the fish through a medial lateral 

 compound radiating organ. Stained: haematoxylin-picric acid-fuchsin. Draw- 

 ing; magnified 1: 140. A, proximal spherical p,art of the organ; a, mass of 

 .small cells in the central portion of the proximal spiierical part of the organ ; C, 

 constriction between the proximal and distal parts of the organ ; c, connective- 

 tissue capsule within the pigment sheath ; D, distal paiaboloidal part of the 

 organ; d, gelatinous connective tissue occupying the distal part of the organ; 

 f, cells in the facets of the outer region; i, inner region; 1, cells composing 

 the middle region ; m, middle region ; o, outer region ; p, pigment sheath ; pc, 

 large conic cells of the inner region ; r, reflecting layer. 



Fig. 46. Transverse section through the centre of the proximal spherical part of a medial 

 lateral compound radiating organ. Stained: haematoxylin-picric acid-fuchsin. 

 Drawing; magnified 1 : 340. a, mass of small cells in the cential portion of the 

 proximal s[)lierical part of the organ; b, blood vessels extending radially to 

 the centre of the sphere ; c, connective-tissue capsule ; lui, nucleus of the conic 

 cells; p, pigment sheath; ph, proximal only slightly stainable part of tiie 

 conic cells; pt, peripheral highly stainable part of the conic cells. 



