LUMINESCENCE 



557 



invaginated from the epidermis into the underlying connective tissue 

 during embryogenesis. The bud enlarges, separates from the epithelium 



Photogenic 

 cells 



Lens 

 body 



Photopenic 

 cells 



Pigmented 

 sheath 



Fig. 13.19. Photophore of the Deep-sea Teleost Stomias, Illustrating a 

 Closed Type. (After Brauer, 1904.) 



&uct 



Reflector 



6 land 

 cells 



Pigment 



Fig. 13.20. Photophore of the Pelagic Teleost Gonostoma elongatum, 

 Illustrating an Open Type. (After Brauer, 1904.) 



and differentiates into a proximal photogenic layer and a distal lens. A 

 dense layer of connective tissue invests the outside of the structure to 

 form a reflector, and to this is added a pigmented screen (2, 25, 28). 



