2i6 J. G. DE Man : The Fauna of Brackish Ponds. [Voi,. II, 



marbled with partlj^ reticulate, darker lines on a pale, olivaceous 

 ground-colour ; fingers ochraceous towards the tip. Ischium and 

 posterior part of the merus of the outer foot-jaws and adjacent parts 

 of the pterygostomian region whitish. Sternum and abdomen 

 mottled with very small, dark points. 



Measurements in millimetres. 



■ cf 



& 



Ovigerous 



Distance between the outer orbital 





2 





angles . . 77 



7-2 



6-2 



575 



Greatest breadth of carapace . . 9 



8-4 



7 



6-5 



Length of carapace, without epi- 









stome . . .6'4 



6 



5' I 



5 



Length of the chelipedes . . 13 



12-5 



575 



6" 25 



Length of the antepenultimatelegs 15 



14-5 



9 



9-5^ 



3. Pachygrapsus propinquus , 



sp. nov. 







(Plate xviii, fig. 2.) 









A young male and a somewhat larger, sterile female from 

 brackish water pools at Port Canning, Lower Bengal. 



Carapace quadrangular, the distance between the outer orbital 

 angles being one-third greater than the length. Upper surface 

 depressed, very slightly arched transversely and longitudinally. 

 Cervical groove quite distinct, interrupted at either side of the 

 transverse median part, which is a little arcuate and placed imme- 

 diately behind the middle. For the rest the regions are not defined, 

 except the posterior cardiac area, which is indistinctly separated by 

 shallow grooves from the branchial regions. Lateral margins of 

 the carapace moderately convergent posteriorly, slightly concave 

 in the middle, with no tooth or spine behind the acute outer orbital 

 angles, that are directed outward. Branchial regions with eight or 

 nine oblique, linear ridges, that barely extend on to the horizontal 

 part of the upper surface ; there is but a single transverse ridge 

 on the hepatic regions, about midway between the orbits and the 

 lateral parts of the cervical groove. 



Front little more than half as broad as the distance between 

 the outer orbital angles ; it is strongly deflexed, though it is still 

 partly visible when the carapace is looked at from above. Frontal 

 lobes four in number, rounded, little prominent; lateral lobes a little 

 broader than the internal ones ; lower margin of the front very 

 slightly concave in the middle, as in Pach. minutus. Anterior half 

 of the gastric region and frontal lobes with numerous, transverse 

 markings that are continued on to the front ; the rest of the upper 

 surface perfectly smooth. Posterior margin of the carapace about 

 three-fourths the breadth of the front. 



Orbits moderately oblique, eye-peduncles nearly smooth. 

 Lower margin of the orbits sharp ; opposite the basal part of the 

 eye-peduncle, between its base and the cornea, the infraorbital 



