TO INDIAN CARCINOLOGY. 



451 



elongated and narrow ; the flagella are wanting in the single specimen. The antennular 

 peduncles are long, and about equal in length to the antenual scales, with the two 

 Hagella subequal, and slightly longer than the carapace. The cervical groove is faintly 

 marked on the carapace. 



The first four pairs of legs are rather short, with the meral and carpal joints broad 

 and flattened, and the lower margin of all the joints fringed with modertitely long but 

 not very numerous hairs ; no spines are visible at the bases of any of the legs. The 

 second and third chelate pairs have the fingers long and slender, almost twdcc the length 

 of the palm. The last pair of legs, in the female at least, are elongated and slender, 

 especially the last three joints, which are cylindrical and very narrow. The thelycum 

 shows two prominent parallel ridges bounding its lateral moieties internally. The last 

 three abdominal segments are carinated, and there are traces of a carina on the third 

 segment. The telson and last appendages are rather short, the former with a lateral 

 basal notch on each side, but the margins otherwise entire, and without spinules, the 

 apex not specially narrowed. 



The branchial formula given below requires confirmation, as taken from a single 

 specimen in which the gills readily became detached. There can be no doubt, however, 

 that the last thoracic segment is without branchiae, and the peu ultimate carries merely 

 a single arthrobranch ; the presence of a pleurobranch on segment VII. is unusual. 



The length of l)ody, not including the rostrum, is 39 mm., of the rostrum 3-3 mm., 

 and of the antennal scales 7 "5 mm. 



Although there is only a single specimen of this species, I have ventured to descinbe 

 it as new, for it possesses very decided characteristics, in the broad flattened feet, the 

 narrow elongatcnl last pair of legs, the long antennular flagella, and the toothing of the 

 rostrum ; these characters arc suflicient to distinguish it irom tlie other described 

 species. It does not belong to the restricted genus Pencsus, and is perhaps typical of a 

 new genei'ic division. In souk; respects it bears a resemblance to certain species of 

 HemipencBus, Bate, but in the diagnosis of this genus the liepatic spine is said to be 

 absent, while it is present in our species. 



