ISOPOD GENUS LIGIDIUM. 



833 



(liftei- in slight particulars from Holmes's (1904) description of 

 Dana's material ; the antennre (judging by Holmes's imperfect 

 figure) are shorter, but as Dana's specin)ens are lai-ger than tliese, 

 the point is not of much systematic value ; the eyes of Dana's 

 specimens are described as " ratiior large '* — a verbal difference 

 depending on an unknown standard. U'liese specimens have 

 smaller eyes than the average in Ligidtum. I'here cannot be 

 much doubt that they are the same, howevei'. 



Text-figure (!. 



IJgidhtm gracile. a, Riiteuua ; h, liead from front ; c, 1st tergite, lateral edge ; 

 d, e &/, 1st and 2nd pleoi)ods of $ ; g, uropod from below. 



The specimens from British Columbia are labelled Avitli an 

 unpublished name by Budde-Lund. They are, however, speci- 

 fically identical with L. gracile, but have interesting differences 

 that entitle them to rank as a variety. Melanin pigment is 

 entirely absent, and the eyes are slightly smaller. I have no 



