PLATE LXIX. 



AdronndhcK iwjer. 

 Fig. 1. Lateral view, showing the disposition of the luminous organs; natural size, from a spirit 

 specimen. 



a, a, Compouud organs ; 4, simple organs ; c, luuiiuuus patch on the aide ; d, on the forehead ; e, c', on 



the upper jaw. 



Fig. 2. Transverse section through the ventral side. x 10. 



«, Conipuund huiiiiiuu.s oigaa ; li, simple luminous organ ; /, intestine ; a, cartilage; V, blood-vessel. 



Fig. 3. Compound luminous organ, from ventral side. Longitudinal section. x 1 00. 



b, comea-.shaped transparent part of .skin over the organ ; c, trausjiareut membrane outside the leus- 



sliapcd body ; d, lens-shaped body ; c, gland-tubes of the .spherical part ; /, pigment -layers ; y, y', 

 pigment coating of the outer and inner parts of the liuuinous body ; /(, gland-tubes in the outer 

 jjart of the luminous organ ; k, granular mass of secretion and cells, inner portion belonging to the 

 glands of the inner part of the organ ; /, granular mass of secretion and cells, outer part ; m, shining 

 membrane within the pigment-mantle of the organ ; n, ganglion cells in the granular central disc. 



Fig. 4. Diagrammatic section through the axis of the compound luminous organ. x 100. 



'(i, Uj, «3, Uj, /',, h.,, h.^, 64, Kays of light emitted from the central part of the organ (k) and retiected in the 

 lower sphcrica! portion of the organ ; c^, c„, Cj, rf,, d„, rf,, c„ <'„, c^, /„ /„, yj, rays of light emitted from 

 the central jiart of the organ (k), in a centrifugal direction, reUectud from the sides of the outer 

 parabolic portion of the organ and refracted by passing through the outer surface of the cornea- 

 like layer (y); Ax, axis of the optical .system ; y, cornea ; h, phosphorescent tissue of the outer 

 parabolic part ; i, glands of the inner spherical part. 



Fig. 5. Longitudinal section of a simple luminous organ. x 150. 



a, Mass of granular secretion and cells ; 6, radial gland-tubes ; c, pigment-mantle ; d, cornea ; c, re- 

 flecting membrane. 



Fig. 6. Section of a lateral luminous patch (c, fig. 1 ). x -tO. 

 a, Pigmented skin of the hsh ; b, vertical gland-tubes. 



Fig. 7. Section of a lateral luminous organ. x 4. 

 o, Phosphorescent glaud. 



Fig. 8. Vertical section of a lateral luminous organ. x 150. 



a, Granular secretion with cells ; b, gland-tubes vertical to ihc skin ; c, pigment-layer ; d, lamella;' of 

 pigment, extending upwards between the gland-tubes. 



Fig. 9. Section through outer portion of simple luminous organ. x 300. 



Fig. 10. Simple luminous organ, seen from without, x 30. 



Fig. 11. Head in profile. x 4. 



«, Frontal phosphorescent glaud ; b, anterior, c, posterior infraorbital phosphorescent glands ; rf, ocellar 

 phosphorescent organs. 



Fig 12. Transverse section of narrow posterior end of anterior infraorbital phosphorescent gland. x 150. 



a, Transparent outer skin. 



Fig. 13. Longitudinal section of anterior infraorbital gland, x 100. 

 a. Transparent outer skin. 



Fig. 14. Portion of the section figured in fig. 13, showing a gland-tube. x 500. 



a, Membrane of the gland-tube ; h, gland-cells : c, lumen of the gland-tube, fiUeil with .secretion ; d, a 

 thread of cartilage. 



