1899.] A. Alcock — Carcinological Fauna of India. 39 



Legs more or less subtomentose, quite unarmed, but the after half 

 of the distal border of the merus of the last pair is finely serrulate. 



The 3rd segment of the abdomen of both sexes is strongly and 

 sharply carinate : the length of the 6th segment of the male is nearly 

 twice its greatest breadth. 



Colours of good fresh spirit specimens, greenish yellow more or less 

 mottled : tip of dactyl as of last pair of legs blackish brown. 



A small species : egg-laden females have the carapace 22 millim. 

 long and 42 millim. broad including spines. 



In the Indian Museum are 137 specimens from the Madras coast, 

 Andamans, G. of Martaban, Penang, and Persian Gulf, besides 6 from 

 Hongkong. 



18. Neptunus {Hellenus) andersoniy de Man. 



Neptunus andersoni, de Man, Joarn. Linn. Soc, Zool., XXII. 1888, p. 70, pi. iv 

 figs. 3, 4: J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 368. 



This species differs from N. hastatoides in the following charac- 

 ters : — 



The carapace is more convex, the subregional elevations, instead 

 of being low and ill-defined, are sharply-defined tubercles, and the 

 oblique ridge that traverses either epibranchial region is particularly 

 salient. The front is more prominent beyond the inner supra-orbital 

 angles and the two middle teeth are less prominent than the others. 

 The posterior angles of the carapace are much less acute. The antero- 

 external angle of the merus of the external maxillipeds is less pro- 

 duced in a lateral direction. The chelipeds are shorter, being less than 

 twice the length of the carapace in the male, and the costse of the wrist 

 and hand are smooth. The 6th segment of the male abdomen is less 

 elongate than in N. hastatoides. 



The colour of good fresh spirit specimens is biscuit yellow with- 

 out any mottling or marking. 



In the Indian Museum are 4 specimens from the Persian Gulf. 



19. Neptunus (Hellenus) spinipes, Miers. 



Neptunus spinipes, Miers, Challenger Brachynra, p. 178, pi. xv. fig. 1. 



This species has a strong superficial resemblance to N. hastatoides^ 

 but is easily distinguished (1) by the more convex carapace (2) by the 

 non-fissured supra-orbital border (3^ by the form of the merus of the 

 external maxillipeds which has its antero-external angle rounded 

 not produced laterally (4) by the spine on the posterior border of the 

 merus of the last pair of legs, and (5) by the position of the anterior 

 spine of the hand, which is placed a good way back instead of imme- 

 diately behind the fiDger-joint. 



