Boone, Crustacea, Cruises of "Eagle" and ''Ara," 1921-28 171 



narrow, obscure, the second segment with a sharp transverse median 

 carina ; the third, fourth and fifth segments fused, with a sharp trans- 

 verse carina proximally ; the sixth segment is scarcely half as long as 

 the fifth; the seventh segment is small, triangular. The female belt 

 is seven-segmented, moderately oval, with the terminal segment 

 abruptly smaller, triangular ; the second and third segments each have 

 a sharp median transverse carina. 



The chelipeds are equal, moderately robust, the merus three-sided; 

 the carpus with a strong, acute, triangular tooth at its inner angle, a 

 weaker tooth at its outer angle, the upper surface slightly roughened ; 

 the propodus is robust with five strong, longitudinal carinae, the upper 

 and lower of which form the margins ; these carinae are continued on 

 the fingers, which are not quite as long as the palms and are regularly 

 toothed with teeth set in clusters of three, the median tooth being the 

 larger ; the finger tips are curved, crossing. 



The ambulatories are very slender, the carpus, propodi and dactyli 

 are grooved, the propodi being very acuminate, fringed with setae 

 along the inferior margin and a trifle more than one and one-half 

 times as long as the related dactyli. 



The natatory legs are unusually robust, the dactyl oval, one and 

 two-fifths times as long as the propodus, which is also laminate, sub- 

 oval. 



The antennae have the basal article greatly enlarged, the free ar- 

 ticles very slender, folding transversely. 



The antennae have the basal article large, but scarcely at all en- 

 larged at the inferior distal angle, the second and third articles are 

 successively smaller, the flagellum is about as long as the long diam- 

 eter of the orbit. 



The eye is large, renif orm ; its lower margin crenulate and fringed 

 with long setae, a deep V-shaped sinus on the outer half; the inner 

 angle acute, prominent. 



The external maxillipeds have the ischium rectangular, rather nar- 

 row, with a longitudinal groove, the inner margin setose ; the merus is 

 nearly square, with the distal margin slightly rounded; the inner 

 angle obliquely excavate for the reception of the palp. 



Synonymy. — Portunus holsatus Fabricius, Entom. Suppl., p. 366, 

 1798.— H. Milne Edwards, Hist. Nat. Crust., vol. 1, p. 442, 1834. 

 — Bell, Brit. Stalkeyed Crust., p. 109, and text fig. on this page, 

 1853. 



