98 BULl.ETIN 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; dactjdi 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 w'idth of carapace 

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



Uahitat. — In transparent tunicates. 



Range. — British Columbia. 



Material examined. — 



Departure Bay, British Columbia; in a transparent tunicate; 

 George W. 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 Bpecies. 



Plate 22, figs. 5 and C. 



Type-locality. — Manzanillo, Mexico; October, 1910; C. K. 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, postero-lateral portion 

 of branchial region forming a steep triangular facet; dorsal surface 

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

 rounded b}'^ 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. 



