34 



P. flumatile var. ibericiim; but the merus of the external maxillipeds is 

 irregularly hexagonal, and is as long as, or a trifle longer than, broad. 



The chelipeds and legs are in a general way as described under P. 

 flnviatile var. ibericum, dififering in the following particulars : — 



As regards the chelipeds, their inequality is less ; the edges of the merus 

 are coarsely serrate rather than crenulate, and a tooth inside the distal end of 

 the lower inner border is enlarged ; the carpus has its upper surface dimpled 

 or umbilicated and its anterior border somewhat swollen ; the whole upper 

 and outer surface of the carpus and palm, and much also of the inner surface 

 of the palm, is rugose or tuberculous (but the tubercles of the palm are never 

 large and bullous) ; the fingers are l)roader, so that when they are closed their 

 cutting edges are in apposition throughout ; and the extensor surface of the 

 fingers is rough, the upper surface of the dactylus being tuberculous or coarsely 

 serrate in its basal half 



As regards the legs, the propodites have their anterior border longi- 

 tudinally grooved, so as to form a distinct double edge as in P. atk'msonianum, 

 koolooense, etc. 



In the largest specimen, a female, the length of the carapace is 1^ inch, 

 the greatest breadth 11 inch. 



P. andersonianum seems to be a species pertaining to Upper Burma 

 and north-eastern Siam, but also occurs in Lower Burma. 



6906 

 ~3~' 

 6916 



~ir' 



6929 



3 ' 

 6932 

 ~3~' 

 6936 

 ~3~' 

 6989 



3 ■ 

 4045 



4 

 4334 



4 



Kakhyen Hills, Ponsee, Ujjper Burma. 



Yunan. 



Pegu. 



Momien, W. Yunan. 



Kakhyen Hills, Ponsee, Upper Burma. 



Burma. 



Momien, W. Yunan. 



Tavoy. 



11. POTAMON (PoTAMON) ANDERSONIANUM, Var. RANGOONENSE. (Fig. 41.) 



Potamon (Potamon) rangoonensis, M. J. Rathbun, Nouv. Archiv. du Museum, Paris (4), VI.. 1904, p. 279, 

 pi. xi., fig. 2. 



This supposed species, founded upon a large male (and a small male not 

 quite similar), is, as a series in this collection shows, only a variety of 

 P. andersonianum. It differs from the type specimen figured by Wood- 

 Mason only in the following particulars : — 



(1) The carapace is a little broader, its length being three-fourths of its 



