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



EXPLANATION OF PLATES. 

 KEY TO THE FIGUEES ON THE PLATES. 



Plate LXIX. figs. 1-14. Plate LXXIL figs. 34-44. 



Plate LXX. figs. 15-24. Plate LXXIIL figs. 45-63. 



Plate LXXL figs. 25-33. 



Phosphorescent Organs. 



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



Opostomias micripnus, . Figs. 34, 35, 37. 



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



Opostomias micripnus, . ^ 



Echiostoma barbatum, . 



Pachystomias microdon, . )>Figs. 1, 2, 5, 10, 38, 39. 



Malacosteus indicus, 



Astronesthes niger, 



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



Opostomias micripnus, 



Echiostoma barbatum, . • ,-,. 



p ; , . . , ^Figs. 1,2, 3, 4,32, 33, 



Facliystomias microdon, . 



Astronesthes niger, . . j 



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



Argyropelecus hemigymnus, . ^ 

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



Scopelus benoiti, . . -' 



5. Regular, ocellar, projecting. 



Xenodermichthys nodulosus, . Figs. 49, 50, 51, 52, 53. 



6. Regular, ocellar, covered organs attached to the lateral line. 



Halosaurus macrochir, . 1 



„- , , , -Figs. 54, 55, 56, 57, 58, 59, 60, 61, 62, 63. 



Halosaurus rostratus, . -J >>';.>>>) 



