4 ORTMANN 
and concave posteriorly. Sternum between fifth pereiopods 
with a strong, triangular, anteriorly directed, spiniform process. 
Description of adult mate of first form: 
FRostrum subovate, upper face slightly concave, margins 
elevated, converging, without marginal spines, contracted into 
a short, triangular acumen, which is shorter than the width of 
the rostrum at the base. Postorbital ridges subparallel, ante- 
riorly without spines. Carapace rather compressed, covered 
with punctations, which are rather large on gastrical region and 
base of rostrum; sides of carapace finely granulated, granules 
more distinct on hepatical region. Suborbital angle blunt. 
Branchiostegal spine short, tuberculiform; cervical groove 
slightly sinuate; no lateral spines on the sides of the carapace ; 
areola wide, with four to five irregular rows of punctations, 
slightly longer than half of the anterior section of the carapace 
(including rostrum). 
Abdomen as wide as, and longer than, carapace; basal seg- 
ment of telson with three or four spines on each side; posterior 
segment semicircular. 
Epistoma with anterior part broadly triangular, sharply 
pointed in the median line; lateral margins concave anteriorly, 
convex posteriorly; azdennal scale broad, greatest width ante- 
rior to the middle; flagellum rather short, reaching to the second 
or third abdominal segment. 
first pereiopods rather stout; hand elongated-ovate, slightly 
compressed; surface with strong, subsquamiform tubercles, dif- 
fering in color from the surface of the hand, being, in alcoholic 
specimens, bluish black, while the rest of the hand is brownish 
yellow; tubercles irregularly distributed, but with the tendency 
to form two or three rows near the inner margin, and slightly 
more crowded on the rounded outer margin of the hand; on 
under surface of hand, the tubercles are more remote from each 
other, and not colored differently from the surface. Fingers 
distinctly longer than the palm, slightly gaping at the bases, 
each with a smooth longitudinal rib on outer and inner face, 
included by rows of punctations; tubercles of palm extending 
upon bases of both fingers, and forming a short row upon prox- 
imal part of outer margin of movable finger; cutting edges with 
