70 DE. J. G. DE MAN ON THE PODOPHTHALMOUS 



Amphitrite gladiator, de Haan, Fauna Japonica, Crust, p. 39, pi. i. fig. 5. 



Neptunus gladiator, Alph. Milne- Edwards, I. c. p. 330. 



Two yerj youug male specimens in the Collection I refer 

 ■with some hesitation to JV. gladiator. 



In the larger specimen, collected in the Mergui Archipelago, 

 the distance between the tips of the epibranchial spines measures 

 only 19 millim., the cepbalothorax being 10| millim. long. The 

 other, still younger individual was found at Owen Island. 



Nepttmtis gladiator, Fabr., N. argentatus, White, N. medius, 

 Stiraps., and N. 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. N. 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 

 N. gladiator. The two median frontal teeth are distinctly 

 developed ; they are, however, much smaller and narrower than 

 the next, but project equally forward. Neptumos 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. 

 Toung individuals of these species doubtless closely resemble 

 young specimens of AcJielous granulatus. 



48. Neptttntjs (Hellentjs) Andeesoni, n. sp. (PI. TV. 

 figs. 3 & 4.) 



One adult female specimen, bearing eggs, was collected at 

 Elphinstone Island. 



This remarkable little Neptunus belongs to the subgenus 

 Sellenus, in which Prof. A. Milne-Edwards grouped those species 

 which have the posterior angles of the cepbalothorax acute and 

 often armed with a short spine (A. Milne-Edwards, "Etudes 

 sur les Crustaces Podophthalmiens," pts. v. and vi., in 'Mission 

 Scientifique au Mexique,' Eecherches Zoolog. iii. partie, p. 210, 

 1879). This species also presents some affinities to the genus 

 XipJionectes of the same author, which I am inclined to regard at 



