328 THE VOYAGE OF H.M.S. CHALLENGER. 



EXPLANATION OF PLATES. 

 KEY TO THE FIGUEES ON THE PLATES. 



Plate LXIX. figs. 1-14. 

 Plate LXX. figs. 15-24. 

 Plate LXXL figs. 25-33. 



Plate LXXIL figs. 34-44. 

 Plate LXXIIL figs. 45-63. 



Phosphoeescent Organs. 



1. Regular, oceUar, simple, sunk, without pigment. 



Opostomias micripims, . Figs. 34, 35, 37. 



2. Regular, ocellar, simple, sunk, with pigment 



Oj)Ostomias micripnus, 

 Echiostoma harbatum, . 

 Pachystomias microdon, 

 Malacosteus indicus, . 

 Astronesthes niger, 



^ 



}>Figs. 1, 2,5, 10, 38, 39. 



3. Regular, ocellar, composite, sunk, without reflector. 



Opostomias miaipmis, . 1 



Echiostoma hai'ha^um, . 



Pachystomias microdon, , j 



Astronesthes niger, . . j 



4. Regular, ocellar, composite, sunk, with reflector. 

 A rgyropelecus hemigymnus, 



Figs. 1, 2, 3, 4, 32, 33. 



Argyropelecus liemigymnus, . ^ 



Sternoptyx diaphana, . . !>Figs. 15, 17, 18, 19, 20, 21, 22, 23, 24, 43, 44. 



Scopehis henoiti, 



5. Regular, ocellar, projecting. 



Xenodeiinichthys nodtdosus, . Figs. 49, 50, 51, 52, 53. 



G. Roo^ular, ocellar, covered organs attached to the latcrul line. 



Hidosaurus macrochir, . ] c^ r:^ cc c^ co kq rn at ro rr, 



^^ , y Figs. 54, 55, 56, 57, 58, 59, 60, 61, 62, 63. 



Ilalosaurus roslratus, . 'J 



