35 



greatest breadth, and the areolation of the gastric region is slightly less distinct 

 in places ; its surface sculptm-e is rougher ; 



(2) The front is narrower — a difference due to age ; and its edge is more 

 sinuous, appearing faintly four-lobed ; 



(3) The sui'face sculpture of the chelipeds is much rougher. 



The largest specimen, a male, has a carapace Ifl inch long by 2s inches in 

 greatest breadth. A female slightly smaller carries about 150 eggs about 

 3 mm. in diameter. 



ilii?. No locality recorded. Captain Butler. 4cJ,2?. 



4: 



till. Tonghoo, Burma. W.Theobald. IcJ, 2?. 



12. POTAMON (PoTAMON) ANDEKSONIANUM, var. ASPERATUM. 



In this variety the entire carapace may be closely covered with minute 

 granules — the only point of difference. 



5543 fGaniam, Cachar Hills,) -n \. j j + io/n \ 



1 I (AAA i- ,. - Purchased. 4 rf, 1 V (all younff). 



10 I about 4000 feet. J ^ > -^ \ j aj 



13. POTAMON (PoTAMON) ANDEKSONIANUM, var. MANIPURENSE. 



In this variety the only difference is — (1) that the surface sculpture of the 

 carapace has a worn look, especially on the side-walls ; and (2) that the edge of 

 the front is a little more sinuous — extremely faintly suggesting four lobes. 



^^. Manipur Hills. H.H.Godwin-Austen. lc?,l?. 



14. POTAMON (PoTAMON) ANDEKSONIANUM, var. TRITUM. 



In this variety the surface sculpture is still more worn looking than in 

 No. 13, especially on the fore part of the side-walls ; and the edge of the front 

 is as sinuous as it is in var. rangoonense, suggesting four lobes. 



— — . Sheetee Hill, Kakhyen Hills. J. Anderson. 1 ? • 



4 



15. PoTAMON (Potamon) edwardsi, Wood-Mason. (Fig. 42.) 



Telphusa edwardsi, Wood-Mason, Journal Asiatic Soc, Bengal, XL., Part II., 1S71, p. 449, pi. xxvii., 

 figs. 11-15. 



Potamon {Potamon) edwardsi, M. J. Rathbun, Nouv. Archiv. du Museum, Paris (4), VI., 1904, p. 274 

 [ubi lit.). 



This species, as Wood-Mason stated, is closely allied to P. andersoniannm. 

 The following are the points of difiference : — 



(1) The carapace is sparingly beset (more thickly on the after part of the 

 side-walls) with stiffish setae, and the edges of the legs are more setose ; 



(2) The tubercles of the fore part of the side-walls are less distinct ; 



