THE CANCROID CEABS OF AMERICA 393 



HEXAPANOPEUS SCHMITTI,« new species 



Plate 169, Figures 3-5 



Type-locality. — Bay of Rio de Janeiro, Brazil; 1925; W. L. Schmitt 

 collector; male holotype (Cat. No. 59831, U.S.N.M.). 



Diagnosis. — Front edge thick, beveled. Anterior margin of third 

 lateral tooth directed outward and slightly forward. A raised bunch 

 of granules on subhepatic region. Color of immovable finger ex- 

 tended backward and upward on palm. Outer ends of third abdom- 

 inal segment of male rounded; terminal segment an acute, equilateral 

 triangle. 



Description. — A small species, representing H. angustifrons in the 

 Southern Hemisphere. Carapace convex, with an ascending antero- 

 lateral rim, as in angustifrons, but less hexagonal, the front being less 

 advanced and the antero-lateral margin more arcuate. Mesogastric 

 region narrower and more regularly tapering. Protogastric regions 

 covered with numerous irregular and unequal rugae, oblique or 

 transverse in direction. On the other areas, the principal single lines 

 of granules are, one transverse and interrupted at middle, on widest 

 part of metagastric region, and one oblique and directed outward 

 and slightly backward on the epibranchial region. An oblique 

 hepatic elevation bears several striae. Front narrow, edge sinuous, 

 median notch minute, outer angles a little more pronounced than in 

 angustifrons; edge thick, obliquely beveled and with a shallow furrow. 

 Supra-orbital notches small, but V-shaped, intervening lobe short, 

 ascending. Sinus between coalesced teeth deepish and rather large 

 in relation to the teeth; remaining sinuses deeper than in angustifrons. 

 Third tooth rectangular at tip, anterior margin oblique; fourth tooth 

 triangular, its posterior margin nearly straight, not convex, and 

 directed backward and inward; last tooth pointing outward. Outer 

 suborbital notch V-shaped, adjacent margin slightly concave and 

 less advanced than in angustifrons, not separated by an emargination 

 from the inner tooth, which is longer than in the related species. 

 A broad, low, subhepatic tubercle. 



Subdistal tooth of merus of cheliped lower and transverse groove 

 deeper than in angustifrons. Groove of carpus also deep and con- 

 tinued backward at the outer end in a right angle; inner tooth shorter 

 and broader at base than in angustifrons. Minor palm shorter than 

 in full grown angustifrons; propodal finger of both chelae more 

 deflexed than in that species. Legs similar to those of the northern 

 species. 



In comparison with angustifrons the third segment of male abdo- 

 men is narrower and its ends more rounded, sixth segment longer, 

 terminal segment longer and more acutely pointed, forming almost 

 an equilateral triangle. 



** For Dr. W. L. Schmitt who, as a fellow under the Walter Rathbone Bacon fund of the Smithsonian 

 Institution, has made extensive collections of crustaceans in South America. 



