Boone, Crustacea, Cruise of ''Alva,'' 1931 109 



The antennulae are folded transversely ■within the fossett and are 

 separated by an interantennulary septum. 



The antennae have the basal article very large, subrectangular, 

 with the distal angle filling the orbital sinus ; the second and third 

 articles and flagellnm are greatly reduced, subrectangular. 



The external maxillipeds are wider than high, nearly square, close- 

 fitting, externally smooth, the ischium is subrectangular with the 

 proximal angle truncated, the inner margins setose; the merus is 

 squarish with the distal margin sinuate, the outer distal angle being 

 rounded ; the inner distal angle truncated ; the palp is three jointed. 



The chelipeds are equal in the female and are of moderate size, 

 closely appressed to the carapace and with the upper and outer sur- 

 faces of the merus, carpus and propodus covered with rounded, beaded 

 lobules, like those of the carapace. There is one rounded, beaded 

 lobule at the exposed distal margin of the merus, the carpus has two 

 lobules on the upper surface and three lobules along the outer side, 

 making five lobules in all on the carpus; these are well separated by 

 deep channels ; the propodus is very little longer than the carpus and 

 is entirely lobulated externally. These are large, convex, beaded 

 lobules along the upper margin; the outer face, which is not greatly 

 dilated, is entirely covered by small and large lobules of granules, 

 which decrease in size toward the lower beaded margin. The fingers 

 are short, stubby, less than one-half the length of the carapace, black, 

 granulose, their entire length moderately deflected, cutting edges 

 shallowly dentate, meeting throughout their length, the tips pointed, 

 sharp. 



The ambulatories are short, slightly decreasing in length in the 

 order 1, 2, 3, 4; each with the merus, carpus and propodus wide, 

 laterally compressed, with the exposed upper surface of the merus, 

 the carpus and propodus covered with convex, beaded lobules, sepa- 

 rated by granular channels, as on the carapace ; the dactyli are nearly 

 as long as the related propodi, stout, tapered subcylindrical, with a 

 curved, horny, sharp tip. 



References: Euxanthus sculptilis Dana, Proc. Acad. Nat. Sci. 

 Phila., vol. 6, p. 75, 1852 ; U. S. Explor. Exped., vol. XIII, Crust, 

 pt. I, p. 173, pi. 8, figs. 8a-d, 1852. — A. Milne Edwards, N;ouv. 

 Archiv. Mus. Hist. Nat. Paris, 1. 1, ser. II, p. 291, 1865.— Ortmann, 

 Zool. Jahrb. Syst., Bd. VII, p. 466, 1893-94.— Alcock, Jour. 

 Asiatic Soc. Bengal, vol. 67, pt. 2, p. Ill, 1898. 



