REPORT ON THE DEEP-SEA FISHES. 



327 



Scheme of the Development of Phosphorescent Organs. 



Pachystomias. 



With superficial 



typical clavate cells, 



with reflector. 



Opostomias. 



With superficial 



typical clavate cells, 



without reflector. 



Ealosaunis. 



Phosphorescent organs 

 along the lateral 

 line. 

 (?) 



XcnodcrmicMhys. 

 Projecting, with 

 clavate cells, with- 

 out reflector. 



Stemoplyx. 



Immersed, with 

 reflector ami 

 clavate cells. 



Eitphausia. 



A hemispherical mass 



of gland-cells with a lens 



at the top, simple. 



Astrfmcsllus. 



Without lens and reflector, 



immersed. Composite, 

 with superficial clavate cells. 



Opostomias. 

 On barhels. 



Astronestlies. 

 In suborbital 



Ilalosaurus. 



Under gill- 

 cover. 



Stemoplyx. 

 On lower jaw. 



Astronesthes. 



Regular groups of undifferentiated 



radially arranged gland-cells, with 



pigment coat. 



Astronestlies. 



Irregular glandular patches 

 on the surface. 



EchiostoTna. 



Regular groups of radially 

 arranged undifferentiated gland- 

 cells, without pigment coat. 



Pyrosoma. 



Irregular groups of undifferentiated 

 gland-cells, without pigment coat. 



Phyllirae. 



Isolated cells containing a vesicle 

 and connected with special ganglion cells. 



Pclagia. 



Isolated gland-cells producing 

 phosphorescent slime. _ 



