TO INDIAN CAKCINOLOGY. 369 



comparing them with De Man's type ; but they agree on the whole with his description 

 and figures. In all the specimens the distance between the external orbital angles is 

 about equal to the length of the carapace, the character on which De Man lays most 

 stress in distinguishing the species from N. hastatoides. The arms of the chelipedes are 

 variable in length, but scarcely so short, even in females, as represented by De Man. 

 The characters of the front are not stated in the original description, as the single type- 

 specimen was injured in this respect ; in the Martaban examples the two median frontal 

 teeth are obtuse and of small size, being less prominent than the lateral teeth, whereas 

 in N. rugosus, A. Milne-Edw., with which De Man also compares his species, there is but 

 a single median tooth. The cai*apace carries seven antero-lateral teeth between the 

 external orbital angle and the long lateral spine, and these teeth, especially the anterior 

 ones, are usually shorter and more obtuse than represented in De Man's figure. The 

 postero-lateral angles of the carapace terminate in a somewhat obtuse tooth, whereas 

 De Man describes it as a spinule. I have some doubt whether the specimens are not 

 referable to a stunted variety of N. hastatoides, for, on examining a large series of the 

 latter, I find variation in the direction of the characters assigned to N. Andersoni ; the 

 characteristic black spot is, however, absent from the swimming dactylus. 



The largest specimen — a female with ova — has the carapace only 9 mm. long and 

 14 mm. broad, not including the lateral spines. 



Distribution. Mergui (De Man). 



95. Nepttjnus tubercttlostjs, A. Milne-Edw. 



N. tuber ctdosus, A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. x. p. 333, pi. xxxi. fig. 5 (1861). 

 N. Brockii, DeMau, Brock's Crust, p. 328, Taf. xiii. fig. 4 (1888). 



Gulf of Martaban, four specimens (Oates). 



De Man, when describing N. Brockii, stated that it might possibly prove to be identical 

 with N. tnberculosus, and the above specimens certainly tend to confirm this opinion. 

 There can be no doubt, I think, that they are identical with the species so well described 

 and figured by De Man. At the same time the median frontal projections are slightly 

 larger than shown in his figure, and they project as far forwards as the contiguous pair, 

 as in N. tvbercalosns ; while, as regards the lateral spines of the carapace, the second, 

 fourth, and sixth are smaller than the others, an arrangement which is indicated in the 

 figures of both writers. In the largest specimen the hand is almost as described by 

 De Man, though a rudimentary spine can be made out over the base of the mobile finger ; 

 in a younger specimen, a second small spine is seen near the articulation with the carpus 

 and on the outer surface, as described by A. Milne-Edwards, and his description was 

 evidently taken from a young individual. I thus imagine the two species are identical. 

 In all probability we have to deal with a species in which certain spines, present in the 

 young, diminish in size or altogether disappear in the adult. 



The carapace of the largest specimen (a female) is 125 mm. long and 'I'l mm. broad, 

 including the lateral spines ; it has a swelling on the left side, evidently due to the 

 presence of a Bopyrid. 



