of the Pacific Shores of North America. 463 
lateral margin convex and well rounded, with nine teeth, 
the inner one forming the outer angle of the orbit; teeth 
deeply separated, their edges denticulated, their apices 
curving forward and very sharp, almost uncinate. Postero- 
lateral margin with a deep emargination near the extremity, 
forming a sharp tooth, and another, rather slight, a short 
distance within the first. "These emarginations are much 
deeper in the young than in the adult. Front sufficiently 
broad, but not projecting farther forward than the exterior 
angle of the orbit ; inter-antennary portion with three well- 
separated teeth, the middle one being smaller and rather 
below the lateral ones; preorbital tooth rather prominent. 
External antenne very large and hairy, in length equalling 
two fifths that of the carapax; apex of basal article pro- 
jecting considerably beyond the preorbital tooth. Third 
article of external maxillipeds subquadrate, a little longer 
than broad ; anterior margin nearly transverse, ciliate with 
ong hairs; angles rounded; notch for insertion of fourth 
article deep, abrupt below, continuous with the margin 
above, The slight ridge on the palate parallel with its 
inner margin is more sharply prominent in this than in any 
other Species. Feet of the first pair large, particularly in 
the male. Carpus and hand rather short and thick, in the 
adult smoothly rounded above and microscopically granu- 
lated, in the young ornamented with small spiniform tuber- 
cles; outer surface of hand costate ; costee well marked and 
granulated in the young, almost obsolete in the adult. Fin- 
gers in the female with linear grooves on the sides. Ambu- 
latory feet hairy ; third articles overreaching the margin of 
© carapax; tarsi with thick brushes of short hair along 
the angles. Margins of abdomen and other parts on the 
erior surface generally, very hairy. Terminal article 
- abdomen in the male slender, with somewhat concave 
sides and bluntly pointed extremity. à 
Color above dark purplish-brown ; below yellowish- 
white, spotted with red; finger and thumb black. 
