250 DEEP SEA FISHES. 



Sf/nodoiitoids from which the lantenis are absent, and Dfijctopholds on which 

 tliey are present. Besides these glands there are luminous organs on the 

 top of the head, on the snout, and on the npper and sometimes the lower 

 edges of the caudal pedicel, in many cases. On some the fins are luminous, 

 especially the adipose dorsal, and the scales rellect the light like mirrors. 

 There are also extraordinary developments of the eye, making it at once an 

 organ of sight, a luminous organ, and a reflector. The greatly modified 

 eyes of Ipnops were shown by Mosely to have the structures of visual 

 organs, yet it is probably the case that the broad ocular areas have the 

 additional functions of phosphorescent organs, of reflectors, and of flash 

 lights. In the iris of various species it is possible the different metallic tints 

 and great brilliancy afford a means of recognition of their fellows by the 

 members of the schools, and the luminosity of the eye itself is much 

 increased in such forms as those ranged in Chlorophthahnus. 



For tactile jiurposes there are excessive developments of the fin rays, 

 and there are also sensory papilloe, as in Bathypterois, similar to those 

 on the blind fishes of the caves, Amblyopsis and Typhliclithys. The 

 lateral canal system retains the characteristics and probably the function 

 of that sj-stem in the shoal water forms moi-e nearly than in some of the 

 other groups. 



By the present collection there is added to the known species a new spe- 

 cies of Chlorophthahnus a new species of Scopelengys, a genus hitherto 

 known only froui the Laccadive Sea where a species was secured by the 

 steamer " Investigator," two new species of Bathypterois, allied to B. lonxjipes 

 and to i>. qundrifills taken by the "Challenger" ofl:' the eastern coasts of 

 South America, a new and very distinct species of Ipnops, and six or seven 

 species belonging to various of the subgenera of Myctophum and all more or 

 less closely allied to species of that genus from the Atlantic. 



The list of the species with ascertained depths is a long one, yet it will 

 midoubtedly be much angmented in the future from other species now 

 known for which no definite depths can be given at present. 



