REVISION OF THE FISH FAMILY LIPARIDAE 29 



important in marking the region between two differently colored 

 faunas is discussed under another heading. What we wish to note 

 here is that none of the species are found on both sides of the 250 to 

 500 fathom region. Certain species extend from far above into this 

 region, others appear to be confined to it, and still others extend from 

 it to the regions far below. The facts seem to indicate that this 

 region marks a distinct change in the environment. It is a dimly 

 lighted region and favorable to the development of the Liparidae. 



The region at from 20 to 30 fathoms separates the typical tide-pool 

 species of Liparis from the shallow-water species of Careproctus and 

 Paraliparis. It is doubtful if any of the tide-pool species extend into 

 this region. A number of species of Liparis cross it, but none of 

 them are known with certainty to inhabit the tide pools. Three 

 species of Careproctus — C. falHandica, C. pallidus, and C. ranula — 

 are reported from depths of less than 20 fathoms. The remaining 

 species of the deeper-water genera extend from 29 fathoms downward. 



The following table indicates the bathymetrical distribution of 

 most of the species of Liparidae. 



