THE CRUSTACEA OF THE BERMUDA ISLANDS. 523 



laboratory was situated. The most of the littoral forms were 

 found in the vicinity of these two places. Tonging for coral in 

 Castle Harbor, at a depth of a few feet, gave some of the rock- 

 living forms, as Alphciis. Expeditions to Castle, Cooper, and 

 St. David islands, increased the number, especially in land 

 and rock crabs {Gccarci?ius and Grapsiis). In 1897 an excellent 

 opportunity was afforded the expedition of learning something 

 of the bottom at six fathoms depth, through the courtesy of Lieut. 

 Gubbins, in charge of the government dredger "St. Albans," at 

 work in the channel at St. George ; from the material thus 

 gathered several species of Alpheiis were procured. In 1898 

 some attempt at hand dredging at the Flatts and in Harrington 

 Sound was made. The securing of a new species of Nika, a 

 genus hitherto unknown from this region, and the Nebalia of 

 the Challenger Expedition, proves that many interesting forms 

 may be found by an extension of the work on these lines. 



CHARACTERISTICS OF THE BERMUDA CRUS- 

 TACEAN FAUNA. 



The physical conditions of the Bermudas : warm, shallow 

 waters, a coral shore, largely rocky, but with stretches of sandy 

 beach, would naturally lead us to expect a similarity in their 

 crustacean fauna to that of the West Indies and the adjacent 

 shores of Florida ; and such, in fact, we find to be the case. 

 The land-crabs, Gecarcinus, find dry exposed hillsides suitable 

 for their burrows ; the mangrove swamps hide the bright col- 

 ored Goniopsis ; on the spray- washed cliffs the rock-crab, Grap- 

 siis, climbs ; the great variety of littoral crabs find shelter under 

 the stones of the beaches ; and masses of Sargassum conceal the 

 Naiitilograpsiis, which, with Leandcr fiatator, and perhaps others, 

 have found their way to the islands in the floating weed. In 

 the tide-pools may be found the swimming zx'ahs,Callinectes and 

 AcJieloils, and the hosts of the agile shrimp, Leander afiriis ; while 

 the coral is tunneled by, and gives shelter to, the Alpheus and 

 Gonodactylus. 



All these characters of the Bermudan shores must be familiar 

 to one who has visited the West Indies ; so it is not surprising 



