( '-^8 ) 



In the female the first abdominal somite carries a pair of small unira- 

 mous appendages : the appendages of the next four somites (2nd-5th) are 

 present on one side only — right or left ; the first three of them are biramous, 

 slender but of good size, for carrying the eggs, and are contained within 

 a capacious cup-like brood-pouch formed by a fleshy lobe that springs from 

 the side of the 5th somite ; the fourth of them is a tiny biramous 

 appendage not enclosed in the brood-pouch. 



In both sexes the appendages of the 6th somite are symmetrical bira- 

 mous swimmerets placed symmetrically on either side of the symmetrical 

 telson : their rami are slender and falciform, the inner one being much 

 reduced in size : an inconspicuous patch of corneous granules exists on the 

 outer surface of the inner ramus, but is almost obsolete on the outer 

 ramus. 



There are 13 branchiae on either side, somite XIV having no pleuro- 

 branch. Each gill consists of two series of leaflets, but each leaflet bears, 

 near the tip, a pair of slender filaments. 



The single known species of the genus does not inhabit a shell, but is 

 protected by the coenosarc of a colony of commensal Anthozoa. It belongs 

 to the sublittoral fauna of the Oriental Region. 



Paguropsis is closely related to Paguristes, from which it differs in its 

 short and stout eyestalks, its non-coiled abdomen and symmetrical tail-fan, 

 its cheliform 4th pair of legs, and in the important fact that its unpaired 

 abdominal appendages are still in an unsettled state. The stout eyestalks 

 and large eyes may be regarded as an adaptation to the gloom of its habitat, 

 and the straight abdomen and cheliform 4th pair of legs as an adaptation to 

 its means of shelter, which does not necessitate any coiling, but does require 

 a well-adjusted grip. The indifferent position of the unpaired abdominal 

 appendages, however, can hardly be of any functional advantage, but may 

 be rather supposed to be a persistent primitive tendency to asymmetry. 



I. Paguropsis typica, Henderson, Plate 11. 



Paguropsis typicus, Henderson, Challenger Anomura, p. 99, pi. x., fig. 4, 1888. 



Chlanopagunis andersoni, Alcock, J. A. S. B., LXVIII, pt. 2, 1899, p. 115, pi. i ; and Illustra- 

 tions of the Zoology of the Investigator, Crust., pi. liii, fig. 1, 2, and pi. liv, fig. I ; and Cat. 

 Indian Deep-Sea Crust. Decap., p. 229. 



The cervical groove is deep-cut, and the portion of the carapace that 

 is included within it is strongly calcified. The triangular cardiac region is 

 also fairly well calcified, especially m its anterior part. But all the rest of 

 the carapace, except here and there along the outer edge of the cervical 



