314 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



rected outward. Ambulatory legs spinulous. Tip of male first pleopod 

 slender, recurving, a loose fold beneath concealing the spermiducal aper- 

 ture. 



Description: Carapace broadly rounded, superficially glabrous, micro- 

 scopically finely pubescent, regions elevated, moderately convex, and 

 separated by sulci with the cervical groove most prominent. Frontal 

 horns short, acute, tips incurving, separated by a narrow V-shaped sinus 

 extending half way to the base of the rostrum. Basal antennal article 

 exposed dorsally to show insertion of flagellum. Orbits with a rectangular 

 preorbital tooth followed by two blunt teeth separated from the concave 

 exorbital tooth by a deep V. Gastric shield elevated, bearing a large 

 tubercle with anterior to it four smaller tubercles in a transverse line, 

 only the median pair conspicuous. Cardiac region convex, rounded, sur- 

 mounted by a prominent tubercle with a faint tubercle on either side, 

 laterad of the cardiac region two small metabranchial tubercles. Hepatic 

 region restricted in size, scarcely inflated, a sharp spinule near the post- 

 orbital spine and three smaller spinules at the subhepatic level. Branchial 

 regions each with five small tubercles disposed as follows: one antero- 

 lateral, two epibranchial, one mesobranchial, and the aforementioned 

 metabranchial. Anterolateral margins with a scattering of spinules, four 

 more prominent than the others, the first and last being the two men- 

 tioned by Stimpson, spinules continued on posterolateral margin. Intes- 

 tinal region confluent with branchial, bearing a pair of distinct tubercles. 



Basal antennal article very broad, anteroexternal spine acute, di- 

 rected obliquely outward as well as forward, second spine also acute, 

 much smaller than first, crowded towards its base, and directed even 

 more laterally. First two free segments flattened slightly, the first equal- 

 ing or exceeding the tips of the rostrum, the flagellum long and filiform. 



Inner and outer borders of endognath of external maxilliped subpar- 

 allel; ischium with inner margin denticulate; merus with outer angle 

 rectangular, slightly rounded, internal angle produced as a blade, a 

 similar extension on the compact and inflated first segment of the three- 

 segmented palp. 



Outer border of merus of male cheliped with six serrate spines in- 

 creasing in size and sharpness distally ; carpus with a proximal spinule ; 

 manus smooth and bare, little inflated, fingers slender, incurving, meet- 

 ing without gape, edges crenulate, internally excavate, a few setae pres- 

 ent within. 



Ambulatory legs hairy and, except for elongate propodal segments, 

 of moderate length; meri considerably widened at midpoint, laterally 



