70 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
Amphitrite gladiator, de Haan, Fauna Japonica, Crust. p. 39, pl.i. fig. 5. 
Neptunus gladiator, Alph. Milne- Edwards, 1. ec. p. 330. 
Two very young male specimens in the Collection I refer 
with some hesitation to WV. gladiator. 
In the larger specimen, collected in the Mergui Archipelago, 
the distance between the tips of the epibranchial spines measures 
only 19 millim., the cephalothorax being 103 millim. long. The 
other, still younger individual was found at Owen Island. 
Neptunus gladiator, Fabr., N. argentatus, White, N. medius, 
Stimps., and WV. gracilimanus, Stimps., are most closely allied 
species of a section distinguished by the posterior margin of the 
arms of the chelipedes being bispinose. These species inhabit the 
same seas, and I think some of them may hereafter prove to be 
identical. MM. gladiator may easily be distinguished from the 
others by the spine with which the upper margin of the orbits 
is armed. In the Mergui specimens, however, I do not observe 
this spine, but the external angle of the median lobe of the 
supraorbital margin only projects a little angularly forward: I 
suppose that this characteristic spine does not occur in very 
young specimens. In other respects they entirely agree with 
NV. gladiator. The two median frontal teeth are distinctly 
developed ; they are, however, much smaller and narrower than 
the next, but project equally forward. Meptunus argentatus, 
according to Prof. A. Milne-Edwards, differs by the carapace 
being comparatively less enlarged, by the absence of the supra- 
orbital spine, and by the median frontal teeth being rudimentary. 
Young individuals of these species doubtless closely resemble 
young specimens of Achelous granulatus. 
48. Neptunus (HELLENUs) ANDERSONI, n. sp. (Pl. IV. 
figs. 3 & 4.) 
One adult female specimen, bearing eggs, was collected at 
Elphinstone Island. | 
This remarkable little Neptunus belongs to the subgenus 
Hellenus, in which Prof. A. Milne-Edwards grouped those species 
which have the posterior angles of the cephalothorax acute and 
often armed with a short spine (A. Milne-Edwards, “Etudes 
sur les Crustacés Podophthalmiens,” pts. v. and vi., in ‘ Mission 
Scientifique au Mexique,’ Recherches Zoolog. ii. partie, p. 210, 
1879). This species also presents some affinities to the genus 
Xiphonectes of the same author, which I am inclined to regard at 
* 
