368 MR. .1. K. HENDERSON — A CONTRIBUTION 



91. Neptunus SANGU1N0I.ENTUS (Herbst). 



JV. Sfinffuino/entus (Ilcrhst), A. Miluc-l'^dwards, Nouv. Arch. Mus. Hist. Nat. t. x. p. 319 (1861). 



RaiiK'swaraui (Thurston) ; Ceylon [Ilaly); Siud, Bombay, Madras (Da//). Very com- 

 mou on tlie S. Indian coast (J. R. H.). 



Disfrihiition. Mascarenes, Malay Archipelago, Japan, Australia, Sandwicli Islands. 



92. Neptunus argentatus. White. 



N. im/i'idiitm (White), A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. \. p. ■V-Vl, \)\. \xi. fig. 4 

 (1801) ; lAIiers, • Challenger' Brachyura, p. 177 (1886). 



Gulf of Martaban, four specimens ( Oates). 



The laryest specimen (a female with ov^a) measures 15 mm. long and 27 mm. broad, 

 including the lateral spines. Tliis species is characterized by the presence of a silvery 

 metallic lustre on the ridges of the chelipedes, on the transverse ridges of the abdomen, 

 and elsewhere, still visible both in the above recorded spirit specimens and in White's 

 dried types. It is very closely allied to N. gladiator, of which species Miers regarded it 

 as constituting a variety, but I am inclined to consider the tn^o as distinct. It is a smaller 

 species than N. gladiator ; the ridge on the outer surface of the baud is much more pro- 

 minent, as also are the ridges on the second and third abdominal segments ; while a black 

 spot is present towards the apex of the swimming dactylus as in N. hastatoides, but 

 which is not seen in N. gladiator. There are also differences in the form of the abdomen 

 — more particularly of the female — in the two species. The median frontal spines are 

 scarcely less developed than in some young specimens of N. gladiator, and there is a 

 rudimentary tooth on the supraorbital margin, as in young N. gladiator, hut in older 

 individuals of tlie latter this becomes a prominent spine. 



Bisfribiitioir. Borneo (TFhite) ; Celebes Sea (Miers). 



93. Nepti Nus HASTATOIDES (Eabr.). 



iV. liu.s/(i/ui<k's (Kabr.), A. Milue-]^]d wards, Nouv. Arch. Mus. Hist. Nat. t. x. p. :332 (1861). 



Gulf of Martaban, a s(n-ies including two with Saccnlina (Oates). Common at Madras 

 (J. R. R.). 



A feiTiale is 20 nun. long and 31 mm. broad, not including the lateral spines. In this 

 species tlie posterior angles of the carapace are acute and terminate in spinules — the 

 character on wJiich Prof. A. Milne-Edwards has founded his subo^enus Rellenns. Tlie 

 lateral spines are longer than in IS', gladiator ; tlic posterior gastric granulated elevations 

 are more pronounced, so as to become almost tubercular ; and the distal half of the 

 swimming dactylus is dark in colour. 



Distribnliuv. From India to Japan and N. Australia. 



94. Neptunus Andehsoni, De Man. 



iV. Aiidcrsoni, Dc Mau, Mergui Crust, p. 70, pi. iv. figs. 3, 1 (1887). 



Gulf of Martaban, ten specimens ( Oates). 



I refer these with some doubt to N. Amlersoni, as I liavo not liad an opportunity of 



