A. E. Vert-ill Decapod Crustacea of Bermuda. 333 



Measurements of Bermuda specimens. 



Carapace Front CbelEe 



No. Sex length breadth width length height 



31 51 49.5 34 28 13 



3153 ? 45 48 21 r. 18 6 



sill F. M. 47 50 17 1. 2-,> 11 



Sometimes it may be seen running with great rapidity over the 

 rough ledges and cliffs, often above high-tide mark, in the same 

 manner as Grapsus grapsits, but it is even more alert, and swifter in 

 its motions, so that its capture is difficult. It readily takes to water 

 when pursued and swims very well. 



Although not rare, it has occurred in but few Bermuda collections, 

 and usually singly, owing probably to the difficulty of capturing it. 



In 1898, April to June, we found it common on the rough shore 

 ledges between tides and above high-water mark at Castle Island, 

 Bailey Bay, and other localities, where also its recently cast-off shells 

 were often found considerably above high tide, as they had been left 

 by the crabs. In 1901, at the same season, we could not find a single 

 specimen, even of the cast-off shells, at the same localities, or else- 

 where. Probably the species had been greatly reduced in numbers 

 by the unusually cold period in the preceding February, when great 

 quantities of the native fishes also perished.* 



It was represented by a single specimen in Mr. Goode's collection. 

 It was also taken by the Field Nat. Hist. Museum expedition in 

 1905, and by Prof. T. Kincaid, 1903. A small specimen is also in 

 the collection of the Bermuda Biological Station, 1903. 



It has an extensive geographical range. On the Atlantic coast it 

 ranges from South Carolina to Brazil, and throughout the West 

 Indies. Pernarnbuco, Brazil (M. J. Rathbun). On the eastern side 

 of the Atlantic it extends from the Mediterranean to South Africa. 

 St. Helena, Ashantee (Benedict). Hong Kong, Bonin Is., Hawaiian 

 Is., Loo Choo Is , and Madeira (Stimpspn). 



At Woods Hole, Mass., a single specimen was taken among barna- 

 cles from the bottom of a vessel that had just arrived from Swan 

 Island, West Indies, Jl. 14, 1887. (t. S. I. Smith in MSS.) 



* See p. 320 above, and the Bermuda Islands, i, p. 94 [506]. 1001. 



