1898.] A. Alcock — Garcinological Fauna of India. 193 



The chelipeds are unequal : the inner angle of the wrist may be 

 sharp, but is never spiniform : the upper and outer surfaces of the 

 wrists, of the smaller hand, and of all but the lower border and lower 

 outer corner of the larger hand (which is quite bare and usually quite 

 smooth) are covered with clusters of granules, some of which, on the 

 smaller hand — and sometimes also on the larger hand — are arranged 

 in longitudinal series. 



The carpopodites and propodites of all the legs, and the meropodites 

 also of the last pair, have the anterior and dorsal aspects granular. The 

 longest legs are not much more than half again as long as the carapace. 



In the Indian Museum are 64 specimens, chiefly from the Anda- 

 man s, but also from Mergui and Palk Straits ; (besides 10 specimens 

 from other parts of the Indo- Pacific). 



Pilumnus vespertilio, var. 



Differs from the above only in having (1) the fur stiff, fine, bristly, 

 and golden-yellow in colour, and (2) the whole of the outer surface — 

 but not the lower border — of the larger hand granular. 



In the Indian Museum are 9 specimens from Karachi and 1 from 

 Tavoy. 



112. Pilumnus longicornis, Hilgendorf. 

 Pilumnus longicomis, Hilgendorf, MB. Ak. Berl., 1878, p. 794, pi. i. figs. 8, 9. 



Carapace covered with a fine and very short fur, amid which — 

 especially anteriorly — are numerous long silky bristles. Legs and 

 chelipeds — except the larger hand, the greater part of which is quite 

 bare — covered with similar fur and fringed with similar bristles. 



Carapace somewhat quadrilateral or hexagonal, about |- as long as 

 broad, anteriorly deflexed, posteriorly flat ; the regions fairly distinctly 

 defined and areolated, the surface granular near the frontal and antero- 

 lateral margins, elsewhere smooth to the naked eye. 



Front obliquely deflexed, about a third the greatest breadth of the 

 carapace, deeply cut into two lobes, each of which consists of a promi- 

 nent angularly- convex inner portion and an independent spiniform outer 

 ancle ; the free edge finely and evenly denticulate. 



Two triangular gaps in the finely denticulated upper orbital margin 

 and a fissure in the denticulated lower margin, just below the outer 

 angle, which is not dentiform or very conspicuous. 



Antero-lateral margin a good deal shorter than the postero-lateral, 

 cut into three longish procurved spiniform teeth the bases of which are 

 granular. No denticle — at most only a slightly-enlarged granule — 

 below the outer angle of the orbit. 

 J. [I. 25 



