J899.] A. A\cock—C arcinological Fauna of India. 43 



pi. XXXI*. fig. 5 : Miers, Challenger Brachyura, p. 176 : J. R. Henderson, Trans. Linn, 

 Soc, Zool., (2) V. 1893, p. 369. 



Carapace flat, its length in the middle line between | and { it3 

 breadth without the great lateral spines, its surface rough, granular, 

 and symmetrically puckered or tubercled. 



Front prominent beyond the inner supra-orbital angles and beyond 

 the epistome, cut into four bluntly triangular teeth of nearly equal size, 

 of which the middle two are the more prominent. Supra-orbital 

 margin cut by two fissures. 



An tero- lateral borders rather long, moderately oblique, cut into 9 

 teeth (including the outer orbital angle) the last of which is about 

 3 times longer than any of the others : the teeth are often rather irregu- 

 lar. Posterior border nearly straight and forming a dentiform angle of 

 junction with the postero-lateral borders. 



The orbits are not completely dorsal. The merus of the external 

 maxillipeds is elongate, but has not the antero- external angle produced 

 laterally. 



Chelipeds of the male a little over twice the length of the cara- 

 pace, granular, the hand the most massive joint. 3, occasionally 4, 

 teeth on the anterior (inner) border of the arm, and 1 at the far end of 

 the posterior border. Hand and upper surface of wrist costate, the 

 cost88 granular: both inner and outer angle of wrist spiniform : two 

 spinules, which are often blunt and inconspicuous, on the hand in the 

 usual position : fingers a good deal shorter than the palm. 



Legs unarmed ; sternum granular. 



A small species ; ovigerous females have the carapace 1 1 millira. 

 long and 21 millim. broad including spines. 



Colours of good fresh spirit specimens yellow, profusely mottled 

 and speckled with brown green and purple. 



In the Indian Museum are 43 specimens from the Andamans, off 

 Ceylon 28 fathoms, and the Persian Gulf. 



23. Neptunus {Hellenus) Brockit, de Man. 



Neptunus hrockii, de Man, Archiv. f. Naturges. LIU. 1887, i. p. 328, pi. xiii. 

 fig. 4. 



Closely resembles N. tuberculosus^ but is distinguished by the 

 following characters, specimens of the same size and sex being com- 

 pared : — 



(1) the front is not cut into teeth, but forms a simple lamina that 

 projects slightly beyond the inner supra-orbital angles ; 



(2) the surface of the carapace is cut up into low granular sub- 

 regional elevations, but the tubercles characteristic of N. tuherculosus 

 are absent : 



