MARINE CRUSTACEANS. 833 



As in Pylopagarus the enlarged right hand is deflexed at an angle with the wrist to 

 form a door to the shell inhabited (a species of Turbo); and somewhat as in Cancellus the 2nd 

 and 3rd pairs of legs support the door though they are not specially modified for the purpose. 



Carapace bearing some tufts of setae, three tufts in a line on either side of the gastric 

 region being conspicuous. Rostrum broadly triangular, but acute, much more prominent than 

 the ill-defined antennal angles of the carapace. 



Eyestalks almost piriform, much shorter than the anterior border of the carapace, reaching 

 into the distal third of the terminal joint of the antennular peduncle, and into the distal 

 half of the same joint of the antennal peduncle. Eyes subreniform, very large and black. 

 Ophthalmic scales distant, narrow, foliaceous, dorsally concave. 



Antennal peduncle decidedly larger than antennular peduncle, setose at base : acicle curved, 

 setose, overlapping base of terminal joint of peduncle : flagellum nearly twice as long as the 

 carapace, nude. 



Chelipeds both tomentose and hairy, but not so as to entirely conceal surface sculpture ; 

 legs hairy. 



Right cheliped vastly more massive than the left, short and stout, the hand permanently 

 deflexed almost at right angles with the wrist: merus pyramidal, smooth and polished: carpus 

 triangular, as long as merus and broader than long; there are 2 or 3 claw-like spines at 

 the far end of its upper border, 3 or 4 spines in a longitudinal row on its upper surface, and a 

 short irregular median series of granules on the same surface : the palm is longer and much 

 broader than the wrist and much broader than long ; its outer edge forms, with that of the 

 fixed finger, a curve of about 120°, and its inner edge, with that of the dactylus, is almost 

 straight, both edges being thickly setose and very regularly serrated ; its extensor surface, when 

 denuded, is found to be studded with granules, of which a few here and there are enlarged : 

 the dactylus is much narrower than the fixed finger and has a median longitudinal row of 

 pearly granules on its upper surface ; the finger tips are calcareous. 



The slender left cheliped reaches the base of the right dactylus : the lower border of its 

 merus is spinulose, and the upper surface of its carpus carries two longitudinal rows of spines : 

 the palm is about as long as the fingers, which are blunt and spooned. 



The 2nd and 3rd legs slightly exceed the larger cheliped, those of the right side being 

 the longer: their three distal joints are not capable of complete extension in a straight line 

 \vith the merus and are carried, much as in Cancellus, almost at right angles with the merus, 

 so that those of the right side are closely applied to the convex outer border of the deflexed 

 hand. The legs are stout and beset with bristles : the dactyli end in sharp black claws, the 

 dactylus of the 3rd pair being as long as, that of the second pair being shorter than, its 

 propodite. 



The male has 4 abdominal appendages on the right side. 



Colours in spirit : eyestalks, chelipeds and legs, reddish-yellow. 



Length of carapace of male nearly 12 mm.: a female with eggs is smaller. 



Maldives, Hulule, Male Atoll, one male and one female. 



In Eupagurus operculatus, Stimpson, fi-om the Florida reefs the right hand forms an 

 operculum as in E. janitor, but the two species do not seem to be otherwise alike. 



107—2 



