FJSCICULI MALATENSES 



129 



11. Potamon (Paratelphusa) improvisum, Lanch. (Fig-. 1) 

 Proc. Zool. Soc, pi. 33, fig. 2, p. 546 (1901) 



Mabek, Hulu Jalor. 



In the above paper I described this species from a single female speci- 

 men. In this collection there are one large male, three small males, and one 

 small female ; and on comparing the large male with the description of the 

 type specimen I note the following differences : — The left hand of the male 

 is much larger than the right, with the hand much swollen, two-thirds as 

 high as long, and with the fingers gaping and hardly crossing at the tips. 

 The first epibranchial tooth (i.e., the one behind the extra-orbital tooth) is 

 blunt and conical, not sharp and conical ; this, however, may be only an 

 individual difference. The external, i.e., lateral portions of the post-frontal 

 crest are just a little more wavy than they appear in the figure (I.e., pi. 33, fig. 2). 

 The branchial regions are markedly excavate. The abdomen may be thus 

 described : The third segment extends proximally between the bases of the 

 legs, and distally becomes only very slightly narrower ; the fourth segment 

 narrows rapidly, its border being somewhat concave ; the fifth segment 

 narrows slightly, while the sixth again slightly expands ; and the seventh, at 

 first becoming narrower, then runs with parallel sides to its rounded termina- 

 tion. 



12. Potamon (Paratelphusa) sex-punctatum, sp. nov. (Fig. 2) 

 i?. Sai Kau, Nawngchik. 



From rice-field. 



1 $ . Cape Patani. 



Freshwater pool. 



In this species there are three epibranchial teeth behind the extra-orbital, 

 the carapace is very convex and marked on the gastric region with six large 

 punctae arranged roughly in a semicircle, and the meropodites of the legs are 

 armed with a sub-distal spine. 



Of the lateral teeth the extra-orbital is blunt, the other three sharp ; all 

 of them flattened conical, the second slightly smaller than the rest. The cara- 

 pace is about one-sixth broader than it is long (43 : 36 mm. and 42 : 34 mm.), 

 covered with distinct and distant punctae, six of which are very large and 

 arranged as in Fig. 2a. The post-frontal crest is distinct and interrupted at a 

 level just inside that of the internal angle of the eye ; the median piece inside 

 this level is only very slightly oblique in a backward direction as it passes out- 

 wards, while outside this level the direction of the crest becomes more oblique 



