PLATE LIX. 



Fig. A. Halosaurus macrochir (page 237). 



Atlantic and Antarctic Oceans, Station V.; deptli, 1090 fatlioms. a, upper side of head ; 

 a', a", two views of the head with the integuments of the lower parts and of the 

 infraorbital ring removed to show the luminous organs. Scale magnified. 



Fig. B. Halosaurus affinis (page 241). 

 South of Japan, Station 235 ; depth, 565 fathoms, b, upper side of head. 



Fig. C. Halosaurus mediorostris (page 239). 

 West of the Philippine Islands, Station 207; depth, 700 fathoms, c, upper side of head. 



Fig. D. Halosaurus rostratus (page 241). 

 Mid Atlantic, Station 63 ; depth, 2750 fathoms, d, upper side of head. 



