Boone, Crustacea, Cruise of "Alva," 1931 197 



The female chelipeds are very weak and small, not longer than the 

 width of the carapace; with the palm small, much compressed later- 

 ally, not much longer than the carpus, the finger slender, one and one- 

 half times as long as the palm, curved inward and with spoon-shaped 

 tips. The fingers have a narrowed gape, meeting only at the hol- 

 lowed, rounded tips ; with a brush of sieve-like setae on the inner dis- 

 tal margin. 



The ambulatories are similar except that the first, second and third 

 pairs have the meral joints foliaceous, while the merus of the smaller 

 fourth pair of legs is not. All of the legs have acute, fluted dactyli. 



The eyes are set upon slender, cylindrical stalks, each of which ex- 

 tends to the outer angle of the carapace, the stalk dilating slightly at 

 the immediate base of the cornea and continued as a narrow line on 

 the frontal side of the cornea, and terminating distally in a rounded 

 node. The cornea is of greater diameter than the stalk and is set ob- 

 liquely terminal, longer on the posterior than on the anterior side. 



The antennulae are greatly reduced and lie semi-concealed in the 

 fossett below the frontal border. 



The antennae are small and occupy the normal position between 

 the angle of the inferior orbital margin and eyestalk ; the basal anten- 

 nal article is enlarged and externally flattened and bent obliquely 

 inward, its distal border touching the base of the eyestalk ; the second 

 and third articles are slenderer, cylindrical, the third being only half 

 so long as the second ; the flagellum is short, composed of about twenty 

 rings and does not extend one-fourth of the length of the eyestalk. 



The external maxillipeds are wider than high, with the lateral 

 margins curved, convergent anteriorly. The ischium is subrectangu- 

 lar with its distal margin oblique; it has the inner lateral margin 

 much thickened, this ridge being paralleled by a longitudinal sulcus 

 that is continuous distally with a much wider median depression on 

 the merus. The merus is much wider than long, with its distal margin 

 truncate and slightly sinuate; the palp is large and swings from the 

 outer distal angle of the merus, across and partly beneath its distal 

 margin and along the inner lateral margin of the merus and ischium. 

 The lateral margins of the palp are setae fringed as are also the inner 

 lateral margins of the merus and ischium. 

 References : f Cancer vocans minor Herbst, Naturg. Krabben und 



Krebse, Bd. I. pt. II, p. 81, pi. 1, fig. 10, 1782-1790. 

 Gelasimus annulipes H. M. Edwards, Hist. Nat. Crust., t. II, p. 55, pi. 

 18, fig. 11-13, 1837.— Ann. Sci. Nat. Zool., ser. 3, vol. 18, p. 149, 



