136 THE VOYAGE OF H.M.S. CHALLENGER. 



animals that have been collected on the Gulf Weed, compiled chiefly from the 

 Challenger collections : — 



Plumularia obliqua, Aglaophenia latecarinata, 1 Desmoscyphus pumilus. 1 



Stylochus mertensi, Stylochus pellucidus. Sjnrorbis sp. 



Pontia atlantica. Lepas anserifera, Lepas pectinata, Lepas anatifera, Conchoderma 

 rirgatum. Amphithoe pelagica, Vibilia pelagica, an Amphipod of the family Hyper- 

 idse. Idotea metcdlica, Idotea whymperi, Bopyrus squillarum, Bopyroides latreuticola. 

 Siriella sp. Sergestes oculatus, Tozeuma stimpsoni, Palcemori pelasgicus, Palwmon fucorum, 

 Leander tenuicornis, Hippolyte tenuii'ostris, Hippolyte ensiferus, Virbius acuminatus, 

 Alpheus sp., Caridina sargopce. Lupea sp., Nautilograpsus minutus, Neptunus sayi. 



Patina tella, Patina pellucida, Lepeta caeca, Ianthina rotundata, Litiopa melanos- 

 toma. Phylliroe atlantica, Scyllcea pelagica, Scyllaa pelagica, var. marginata, sEoli- 

 della occidentalis, Spurilla sargassicola, Fiona marina, Cuthona pumilio, Glaucus 

 atlanticus, Doto pygmcea. Creseis spinifera. Onychia caribcea. 



Membvanipora tuberculata, Flustra membranacea, Flustra tuberculata, Flustra 

 peregrina. 



Antennarius marmoratus, Dactylopteris volitans, Syngnathus pelagicus. 



The nest of Antennarius, an ally of the common Angler of British seas, though 

 very unlike it in its habits, was frequently procured ; it is composed of bunches of 

 the Gulf Weed bound together by means of long sticky gelatinous strings formed by 

 the fish for this purpose, and is filled with eggs. 



The Gulf Weed fauna, as is well known to naturalists, is a peculiar one, and presents 

 many remarkable instances of protective resemblance. The Crustacea, Molluscs, and Fish 

 are all bright yellow or orange in colour with white spots, thus imitating very perfectly 

 the Gulf Weed with the white patches of Membranipora and Cirripeds. A similar fauna, 

 comprising species of some of the same genera (e.g. Antennarius), inhabits the floating 

 weed in the Pacific Ocean. Oscillatorise were very abundant on the surface throughout 

 this trip, and at times were sufficient to discolour the water for several miles. 



On the 3rd April the Bermudas were sighted at 2 p.m., and that day and the 

 greater part of the 4th were occupied in obtaining soundings and dredgings off the 

 group. In the afternoon of the 4th, the ship proceeded to the anchorage in Grassy Bay. 



Bermuda. 



At, and in the neighbourhood of, this interesting group of islands, the Challenger 

 remained from the 4th to the 23rd April, and from the 28th May to the 13th June. 

 The group, with its outlying reefs, is in the formof an ellipse, the major axis of which 



1 Professor Allman says that these two species are destitute of gonosomes, a fact probably connected with the float- 

 ing habit of the plant, which is itself never provided with reproductive organs in the Sargasso Sea. 



