Plate 10. 



Figs. 47-51. Stomias hexagonatus Garman. 



Fig. 47. Tlie fish seen from tlie side. Drawing ; natural size, a, ventrocaudal compound 

 radiating organs ; al, anterior lateral compound radiating organs ; g, guttural 

 compound radiating organs ; L, radiating organ of the barbel ; ml, medial 

 lateral compound radiating organs ; so, suborbital radiating organ ; ve, ventro- 

 medial compound radiating organs ; vt, ventrothoracic compound radiating 

 organs. 



Fig. 48. Tlie fish seen from below. Drawing ; natural size, a, ventrocaudal compound 

 radiating organs ; al, anterior lateral compound radiating organs ; g, guttural 

 compound radiating organs; ml, medial lateral compound radiating organs; ve, 

 ventromedial compound radiating organs; vt, ventrothoracic compound radiating 

 organs. 



Fig. 49. Transverse section through the outer distal part of the cylindroconic plug-shaped 

 part of a ventrothoracic compound radiating organ. Stained: haematoxylin- 

 picric acid-fuchsin. Drawing ; magnified 1 : 280. cc, central facet of cylindro- 

 conic plug ; pc, transverse sections of cells in the outer facets of the cylindroconic 

 plug. 



Fig. 50. Axial section transverse to the barbel through the radiating organ of the barbel. 

 Stained: haeraatoxylin-picric acid-fuchsin. Drawing; magnified 1 : 120. A, 

 upper (dorsal) part of the organ ; B, lower (ventral) part of the organ ; b, 

 blood vessel following the axial thread, and sinuous blood vessels in the lower 

 chamber of the dorsal part of the organ ; c, connective-tissue sheath inclosing 

 the organ ; cv, cavities in the upper part of the organ ; p, dorsal pigment 

 sheath ; pc, large radial conic cells of the lower spherical part of the organ ; 

 pra, pigmented membrane traversing the upper part of the organ; pt, annular 

 thickening of the pigment layer ; z, axial thread in the lower spherical part of 

 the organ. 



Fig. 51. Axial section vertical to the medial plane of the fish through a ventrothoracic com- 

 pound radiating organ. Stained : haematoxylin-picric acid-fuchsin. Drawing ; 

 magnified 1 : 160. d, blood vessels in the septa between the conic cells of the 

 proximal spherical part of the organ ; c, connective tissue covering the distal 

 part of the organ on the outer side; cc, central facet of cylindroconic plug 

 forming the distal part of the organ; co, conic proximal end of the outer plug- 

 shaped part of the organ ; cy, cylindroconic plug-shaped outer part of the organ ; 

 p, pigment sheath ; pc, longitudinally elongated cells in the outer facets of the 

 plug-shaped distal part of the organ ; ph, inner only slightly stainable part of 

 the radiating conic cells in the proximal spherical part of the organ ; r, annular 

 reflecting membrane surrounding the plug-shaped distal part of the organ ; s, 

 annular cavity surrounding the plug-shaped distal part of the organ. 



