CRUSTACEA WHITELEGGE. 129 



a crowd of which scattered before the footsteps of a visitor, and 

 sought refuge under loose coral blocks or in deep pools. Rolling 

 over a slab of dead coral rock anywhere between tide marks 

 exposed the haunt of a little community of Petrolisthes dentata 

 and Leiolophus planissiinus. Intercepted in their efforts to 

 escape, these would flatten themselves down to the surface of the 

 stone so closely that the collector's fingers with difficulty grasped 

 them. The deeper rock-pools at the border of the reef-flat, the 

 chief home of Salarius, were usually tenanted by a few Calcinus 

 elegans, whose brilliant red, blue, and white claws distinguished 

 it as the dandy of the company. This species is never found out 

 of the range of rough waves. The extreme windward portion of 

 the reef left dry at low tide was but rarely attainable ; Aniculus, 

 whose bristly claws usually protruded from a stolen Turbo shell, 

 was a distinctive feature of this zone. In the honey-combed pits 

 of the nullipore mounds that breasted the surf, cowered Daira 

 perlata. The close resemblance of colour and contour to the sur- 

 rounding rock, rendered this crab difficult to detect, and when 

 seen the creature's powers of adherence and the sweep of the 

 Pacific rollers rendered it as difficult to seize. 



" The mangrove swamp was very barren of Crustacea compared 

 to the usual population of such places. One quite missed the 

 droll little Gelasmus, waving his big claw in defiance. After 

 gathering coconuts, the natives usually husk them on the spot 

 and throw the discarded husks in a pile to decay. These stacks 

 of rotting husks are prolific collecting grounds for Invertebrata in 

 general, and the favourite shelter in day time for Birgus and 

 Cardisoma, the latter of which also burrowed in soft muddy 

 places." 



BRACHYURA. 



Tribe CYCLOMETOPA. 



ATERGATIS FLORIDUS, Rumph. 

 Atergatis jioridus (Rumph.), Dana, Crust. U.S. Explor. Exped., i., 



p. 159, pi. vii., fig. 4. 



Fourteen specimens of this very common species were obtained 

 on the outer reef at low tide line. 



RUGATA, Adams & White. 

 Actim rugata, Adams & White, Voy. "Samarang," Crust., 1848, 



p. 43, pi. viii., fig. 5. 



One half grown example, the colour being well preserved. The 

 upper surface of the carapace presents three reddish and four 

 white longitudinal lines, disposed as follows : a median red line 

 extending from the front to the first post abdominal segment, 



