REPORT ON THE DEEP-SEA FISHES. 



327 



Scheme of the Development op' Phosphorescent Organs. 



Pachystomias. 



With superficial 



typical clavate cells, 



with reflector. 



Opostomitis. 



With superficial 



typical clavate cells, 



without reflector. 



BalosauTus. 



Phosphorescent organs 

 along the lateral 

 line. 

 (?) 



XcnodcrmKhthys. 

 Projecting, with 

 clavate cells, with- 

 out reflector. 



Euphausia. 



A hemispherical mass 



of gland-cells with a lens 



at the top, simple. 



Stcrjwpiyx, 



Immersed, with 

 reflector and 

 clavate cells. 



Astronesthcs. 



Without lens and reflector, 



immersed. Composite, 

 with superficial clavate cells. 



Opostmnias. Aslroncslhes. Halosaurus. Sternoptyx. 



On barbels. In suborbital Under gill- On lower jaw. 

 region. cover. 



AstroncstJi^. 



Regular groups of undifferentiated 



radially arranged gland-cells, with 



pigment coat. 



Astrcmcsthes. 



Irregular glandular patches 

 on the surface. 



Echiostoma. 



Regular gi-oups of radially 

 arranged undifferentiated gland- 

 cells, without pigment coat. 



Pyrosmna. 



Irregular groups of undifferentiated 

 gland-cells, without pigment coat. 



PhyUiroi. 



Isolated cells containing a vesicle 

 and connected with special ganglion cells. 



Pelagia. 



Isolated gland-cells producing 

 phosphorescent slime. _ 



