538 Mr. L. A. Borradaile on the 
back and the cervical groove more or less indistinct, the eyes 
pale, the antennal thorns both of a good size, pleurobranchs 
on the second to fourth legs, no vestiges of gills on the 
second maxillipeds *, and a deep-water habitat.” 
Species : 
Type. A. acutifrons (Bate), 1888. ‘Challenger’ Macrura. I. 
A. kermadeci (Bate), 1888. ‘Challenger’ Macrura. I. 
A. parvus (Bate), 1888. > a I. 
? A. erista-galli, Fax., 1893. Bull. Mus. Harvard, xxiv. G. 
Subgenus Paraxtvs, Bate, 1888. 
Definition: “Species of Awius with the flat area of the 
back and the cervical groove not sharply marked, the eyes 
pale, the antennal thorns both very small, no pleurobranchs, 
no gills on the second maxilliped, and a deep-water habitat.” 
Species : 
Type. A. altus (Bate), 1888. ‘Challenger’ Macrura. I. 
Lack of information makes it impossible to place the 
following species :— 
. serratus, Stimps., 1852. Proc. Boston Soc. Nat. Hist. iv. A. 
. armatus, S. 1. Smith, 1880. P. U.S. Nat. Mus. ii. A. 
. spinulieauda, Rathb., 1902. P. U.S. Nat. Mus. xxiv. H. 
. elegans. 
ps ps ps be 
Genus Axropsis, n. 
Definition: “ Axiide with a flat area on the back in the 
fore part of the carapace well marked and continuous with 
the rostrum, no keel on the carapace behind the cervical 
groove, the eyes well pigmented, the antennal thorns long or 
of middle size, the legs of the second pair chelate, [an arthro- 
branch and a podobranch on the second maxilliped, no pleuro- 
branchs +], and a suture on the exopodite of the last limb.” 
Species : 
Type. A. affinis (de Man), 1887. Arch. Naturges. liii.i. I. 
A, princeps (Boas), 1880. Dansk. Vidensk. Selsk. Skrifter, (6) i. H. 
A. spinipes (de Man), 1887. Arch. Naturges. hii. i. I. 
? A, biserratus (Martens), 1869. Mon.-Ber. Ak. Berlin, 1868. I. 
? A. serratifrons (A. M.-Edw.), 1873. J. Mus. Godef. iv. I. 
* As it was very difficult to be certain of this point in the small speci- 
mens of Ficonaxius and Paraxius, from which the jaws of one side had 
sometimes been removed, it is possible that the above statement may be 
wrong. In that case the last difference between Liconaxius and Icon- 
axiopsis will have gone, for the exopodite of the second maxilla of the 
former is longer than the endopodite, and not as Bate figures it. 
+ These particulars as to the gills refer to the type only. They may 
or may not be true of the other species, which I have not examined. 
