250 DEEP SEA FISHES. 
Synodontoids from which the lanterns are absent, and Myctophoids on which 
they are present. Besides these glands there are luminous organs on the 
top of the head, on the snout, and on the upper 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 reflect 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 Chlorophthalmus. 
For tactile purposes there are excessive developments of the fin rays, 
and there are also sensory papille, as in Bathypterois, similar to those 
on the blind fishes of the caves, Amblyopsis and Typhlichthys. The 
lateral canal system retains the characteristics and probably the function 
of that system in the shoal water forms more nearly than in some of the 
other groups. 
By the present collection there is added to the known species a new spe- 
cies of Chlorophthalmus a new species of Scopelengys, a genus hitherto 
known only from the Laceadive Sea where a species was secured by the 
steamer “ Investigator,” two new species of Bathypterois, allied to B. dongipes 
and to B. quadrifilis taken by the “Challenger” off 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 
undoubtedly be much augmented in the future from other species now 
known for which no definite depths can be given at present. 
