290 FISHES 



only abyssal fishes which are totally blind, the eyes in these 

 being absent. It is probable that they live buried in the mud. 

 One of these, Typhlonus nasus, was taken at 2150 to 2440 

 fathoms, the other Aphyonus at 955 to 1400 fathoms. The 

 species of abyssal Brotuloids are numerous, and many of them 

 come from the greatest depths ; they usually have the sense- 

 tubes, especially on the head, greatly enlarged and transparent, 

 the sense organs within being large and conspicuous. A few 

 other spiny-finned families have members at moderate depths 

 less than 1000 fathoms, such as Scorpaenidae, and Cyclopteridae, 

 or lump-suckers ; in fact species of Paraliparis of the latter 

 family range to 1800 fathoms, but the most peculiar and 

 characteristic forms are those mentioned. 



Chimaeroids live for the most part in deep water, Harriotta 

 having been taken only at depths between 707 and 1080 

 fathoms. Of Elasmobranchs few are really abyssal, only two 

 or three species of Raia having been taken at depths over 1000 

 fathoms. Centrophorns is the bathybial genus of the sharks or 

 Selachians, two of its species passing beyond the 1000 fathom 

 line. Several members of the order, however, extend beyond 

 200 fathoms. 



