BRACHYURA. 415 



(1) It possesses a single median frontal tooth instead of a pair, so that the front is 

 cut into three teeth only. (This median tooth is somewhat smaller and less prominent 

 than the lateral teeth, and its apex is flattened.) 



(2) The tip of the dactylopodite of walking leg 4 is not darkened in colour (one 

 must, of course, not overlook the possible agency of the spirit in producing this 

 appearance). 



(3) The carina of abdominal segment III. is more prominent in its middle portion 

 and its median notch is deeper, approaching in appearance that of N. maciophthalmus, 

 Rathbun, 1903 (R, p. 871, fig. 31). 



The granulation of the sternum of this male closely resembles that of the adult 

 male of N. hastatoides. 



Remarks. I call attention to the absence of both chelipeds. It is therefore 

 impossible to ascertain various essential characters. Leaving these necessarily out of 

 consideration, the specimen is so closely similar to N. hastatoides (except in particulars 

 given above) that it may be conveniently included as a varietal example of that 

 species, in which the pair of narrow median frontal teeth have coalesced. This latter 

 particular seems of sufficient interest to warrant my putting the specimen on record. 

 I append the following measurements : 



C.b.! (a straight line uniting the notches between the 8th and 9th anterolateral 

 teeth of either side)-;- CI. = 1*51 ; C.b. 2 (a straight line uniting points immediately 

 behind the great lateral spines) -r-Cl. = 1*10; Posterior border of C -rC.l. = 0'65 ; 

 Frontal b.-r-Cl. = 0'41 ; Fronto-orb.b. -r-Cl. = 0'82 ; lateral spine 1. (posterior border) 

 -5-C.L = - 49 ; antero-lateral border of C (a straight line uniting outer orbital angle 

 with notch between the great lateral spine and the tooth in front of it) -J- CI. = 0'69 ; 

 postero-lateral border of C. (a straight line uniting base of great lateral spine with 

 posterolateral angle) -f- CI. = - 39. 



Neptunus (Hellenus) spinipes, Miers, 1886 A.4, p. 39. 



Locality : Galle, one specimen. 



Description : An adult male, CI. = ll'OO. 



Remarks. I have examined the Martaban specimens placed by Henderson as 

 N. andersoni, and which are preserved in the British Museum, and find that in 

 reality they are N. spinipes of Miers, whose "Challenger" specimens I have also 

 consulted. 



Neptunus (Hellenus) longispinosus (Dana), var. bidens, nov. (See A.4, p. 40). 



Localities: Off Negombo, one specimen (adult cf); off Mutwal Island, one 

 specimen (adult <$ ) ; Gulf of Manaar, one specimen (ovigerous ? ). 



Description: CI. of an ovigerous female = 6'50. 



In all three specimens the hand has only two spines, a point of resemblance to 

 Neptunus {Hellenus) tuberculosus, A. Milne-Edwards. I suggest for them the 

 varietal name bidens. 



