98 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



nearly of a length, of the fourth pair shorter ; besides the close, short 

 hair with which they are covered, there is on the posterior surface of 

 the last three segments of the second and third legs a thin fringe of 

 long, fine hairs; it extends obliquely across carpus and near upper 

 edge of propodus and dactylus; dactyli similar, curved, rather nar- 

 row with long, slender tips. 



Segments of abdomen separate; lateral margins of third segment 

 arcuate ; terminal segment equilaterally triangular, blunt-pointed. 



Measurements. Female, holotype, length and width of carapace 

 each 4.4 mm.; male (40397), length 4.3, width 4.2 mm. 



Habitat. In transparent tunicates. 



Range. British Columbia. 



Material examined. 



Departure Bay, British Columbia; in a transparent tunicate; 

 George TV. Taylor, collector; 1 male, 1 young female (39127). 

 " Common." 



Ucluelet, British Columbia; in transparent tunicates; Geological 

 Survey of Canada; 1 male, 1 female holotype (40397). 



Variations. The immature female from Departure Bay has an 

 abdomen almost as narrow as the male, which in other respects it 

 entirely resembles. In both the carapace has a more uneven surface 

 than in the male from Ucluelet which is a little larger, and the lat- 

 eral margin at widest part of carapace shows a short raised rim. 



PINNOTHERES ORCUTTI. new species. 



Plate 22, figs. 5 and G. 



Type-locality. Manzanillo, Mexico; October, 1910; C. R. Orcutt, 

 collector; 1 male holotype, dried (49215). 



Diagnosis. Longer than broad, hairy. Cheliped very stout. Sec- 

 ond leg longest, fourth shortest; dactyli slender, curved, subequal. 

 End joint of outer maxilliped minute, attached to distal, oblique 

 margin of preceding segment. 



Description of male. Small. Carapace subhexagonal, longer than 

 broad, broadest in posterior half, very uneven, postere-lateral portion 

 of branchial region forming a steep triangular facet; dorsal surface 

 densely hairy and bordered by a raised rim; cardiac region sur- 

 rounded by a furrow except anteriorly, and surmounted by a median 

 tubercle near its posterior end. Front truncate, corners rounded, a 

 small but clear-cut, triangular, median notch; behind this runs a 

 broad median furrow. Lateral margins long, convex ; postero-lateral 

 margins short, concave; posterior margin short and straight. Basal 

 segment of antenna elongate and very obliquely placed. 



