( 134 ) 



In the male, besides the appendages that form the tail-fan, there are 

 only three abdominal appendages (somites 3 to 5) : they are placed on the left 

 side and are very unequally biramous. In the female the ist abdominal somite 

 carries a pair of uniramous appendages, and the next four somites (2 — 5) each 

 have on the left side an appendage, the first three being large and biramous, 

 the fourth having one ramus rudimentary. The telson and uropods are more 

 developed on the left side than on the right. 



The gills, which are particularly large and feathery, are 13 on either side, 

 namely a pair of arthrobranchs on somites IX to XIII and a pleurobranch 

 on somites XI to XIII as in Paguropsis, Paguristes, Clibanarius, Diogenes and 

 Troglopagurus. The gill-filaments are long and narrow and are in two rows 

 in each gill-plume. 



This rather singular genus seems to be restricted to the sublittoral slope 

 of the Bay of Bengal. Its nearest relations seem to be with Pylopagunis, 

 a genus whose optimum is in the West Indian region. From Pylopagurus 

 it differs (i) in having a pleurobranch on somites XI and XII, so that the 

 number of gills is 13 instead of 1 1 ; and (2) in the form of the right hand, 

 which, although it forms an operculum to the tenement and is undoubtedly 

 buttressed for that purpose, is not bent downwards at an angle with the wrist. 



It is also closely related to Eiipagurus, differing however from that genus 

 in the number of gills (13 instead of 11); in the vertical, instead of hori- 

 zontal, movement of the fingers ; and in the fact that the female carries a pair 

 of appendages on the first abdominal somite. 



I. Pylopaguropsis magnimanus, Henderson. Plate XIII., fig 2. 



Fylopagutus magnimanus, Henderson, J. A, S. B., LXV., 1896, pt. 2, p. 522 : 111. Zool. Inves- 

 tigator, Crust., pi. xxxi., fig. 2. 



Gastric region well calcified in the form of a well-defined shield: 

 strongly-calcified strips define (i) the hepatic regions, and (2) the posterior 

 three-fourths of the branchial regions. 



Rostrum broadly triangular, acute, reaching forward between the 

 ophthalmic scales and well beyond the antennal angles of the carapace. 



Eyestalks moderately slender, but distinctly expanded distally ; they 

 reach hardly to the middle third of the terminal joint of the antennular, 

 and a little beyond the middle of the same joint of the antennal, peduncle. 

 Ophthalmic scales acute, bearing — like the distal end of the eyestalk — a 

 few lank setse. 



Antennular peduncle more than half the length of the carapace, the 

 terminal joint contributing more than half its length. 



