54 



obscure wrinkles near the antero-lateral borders and some Hue short striations 

 across the postero-lateral borders. 



Gastric region well defined, but, except for the furrow-like continuation of 

 the fore-lobe of the mesogastric area, not areolated. Cervical groove distinct 

 but broad and superficial, becoming lost just behind the post-orbital crests. 

 Epibranchial regions not distinctly areolated, but broken by broad ill-defined 

 depressions. 



Epigastric crests blunt and wrinkled, continuous with the almost trenchant 

 post-orbital crests ; these latter are quite transverse and curve forwards distally 

 to join the lateral epibranchial tooth. 



Front, in adult, not much more than one-fourth the greatest breadth of the 

 carapace, moderately deflexed, deeply bilobed, the lobes not making an angle 

 with the orbit. Outer orbital angle well marked, separated from the lower 

 border of the orbit by a gap. 



Antero-lateral borders of the carapace not cristiform, rather irregularly 

 crenulate ; lateral epibranchial tooth fairly distinct. 



In the male abdomen the length of the 6th segment is a little more 

 than half its greatest breadth, and the 7th segment is not quite as long as 

 broad. 



The exopodites of the maxillipeds have strong flagella. The merus of the 

 external maxillipeds is a little broader than long. 



" The chelipeds are greatly unequal in males and subequal in females ; 

 the meropodites are rugose and have a few hairs near the base of the posterior 

 angle ; the carpopodites are rugose above, and bear a strong sharp spine in the 

 usual position and beneath it a smaller one ; the pincers are multidentate and 

 their arms cross at the extremities." 



" The ambulatory legs are very long." 



In the largest specimen the carapace is ItV inch long, 1 ] ,t inch broad, and 

 nrths inch deep. 



Penang. F. Stoliczka. 1 (J, 1 ?, types of the species. 



28. PoTAMON (Potamon) thagatense, Eathbun. (Fig. 47.) 



Potamon(,Potamon)thagatetisis, Mary J. Rathbun, Nouv. Archiv. du Museum, Paris (4), VI., 1904, p. 296 

 {ubi synmi.). 



This species (the " Telphusa stoliczkana " of de Man) is nearest to P. stolicz- 

 kanum, Wood-Mason. 



The carapace is flat ; its length is about three-fomths its greatest breadth, 

 its depth just exceeds two-fifths its length ; its surface is pitted, but is otherwise 

 remarkably smooth. 



