A-l." List of species and area of occurrence (Continued) 



^ Makarov (1935) cites P. borealis eous as a variation of P. borealis. Dr. Holthuis believes that it must have the rank of sub- 

 species (personal conversation). 



Kobiakova (1937) and other Russian systematists consider C communis to be a member of the genus Sclerocrangon. 



20 



