CARCINOLOGICAL STUDIES. 229 



ual of the Linnean Society of London, Vol. XXIT , 1888, 

 p. 52), and it appears most closely allied to Heteropanope 

 indica de Man , that inhabits the Mergui Archipelago. 



As regards indeed the general form of the cephalotho- 

 rax , of the chelipedes and of the ambulatory legs , both 

 species no doubt present a striking resemblance with one 

 another and it is only by a close examination that the 

 slight differences can be observed. As in the Mergui spe- 

 cies, the cephalothorax is broadest at the third antero- 

 lateral teeth ; the proportion of the width of the cephalo- 

 thorax to the length is nearly quite the same in both 

 species. The upper surface , rather depressed in Heterop. 

 indica , appears to be slightly convex in the Dutch 

 species and distinctly declivous towards the front and the 

 lateral margins. The transverse groove , separating the car- 

 diac region from the mesogastric area, is rather deep and 

 the two grooves which border the latter anteriorly and 

 converge towards the very slight frontal furrow , are also 

 quite distinct, but the other interregional grooves are 

 faintly marked. The posterior branchial regions are some- 

 what rugose and the anterior half of the upper surface is 

 marked , like in Heterop. indica , with some transverse , 

 minutely granulated , pubescent , elevated lines , five on 

 each side, which, however, present a different 

 arrangement in both species. The epigastric lobes, 

 lying immediately behind the frontal margin , and each 

 of which in the Mergui species bears a transverse line, 

 appear smooth in Heterop. tridentata. In both species 

 each protogastric lobe is marked with two transverse li- 

 nes; in Heterop. indica these ridges are placed nearly in 

 the same transverse line near one another, but in Heterop. 

 tridentata they are placed behind one another, and the 

 anterior is somewhat shorter than the posterior; in some 

 individuals these two lines are divided into smaller ones. 

 The mesogastric area presents on each side a 

 transverse line, but in Heterop. indica this region is 

 smooth. The fourth or last antero-lateral tooth is slightly 



Notes from the Ley den ]Muse\iiii, Vol. XIV. 



