90 THE BERMUDA ISLANDS. 



while they differ somewhat from tlie closely related Epidromus 

 Swifti, from Antigua. A seemingly undescribed form of Col- 

 umbella (Anachis) is, so far as I have been, able to determine, 

 most nearly related to a species from New Caledonia, Anachis 

 plicaria ; Natica Marochinensis is a member of the faunas of both 

 Western Africa and the Pacific, and Natica ladea is apparently 

 undistinguishable from N. Flamingiana, from the Viti (Feejee) 

 Islands, Philippines, etc.whence we have also the Area imhricata- 

 A number of forms common to the west coast of Africa and to 

 the southern waters of Europe also occur, but these appear to 

 be less numerous than the forms which occur in the Pacific 

 and Indian oceans. Seemingly but few of the Bermudian 

 species are found in the Azores {Purpura hsemmstoma, Neritina 

 viridis, Avicula Atlantica, Pinna rudis), a somewhat surprising 

 circumstance in view of the large representation of Pacific forms, 

 and considering that the Azores lie directly in the path of the 

 heated waters of the Gulf Stream. It is, indeed, difficult to 

 account for these anomalies of distribution, and for still more 

 marked ones, as we shall presently see, which are presented by 

 the Crustacea. 



Of molluscan forms which have been hitherto considered 

 to be restricted to the west coast of America, I can state the 

 positive occurrence of only two or three species — Chama 

 exogyra, Tellina Gouldii, from the Californian coast. In the 

 case of both of these forms I have very carefully satisfied my- 

 self as to absolute identity. Area solida, from the west coast, 

 does not appear to differ measurably from Area Adamsi, 

 a West Indian form which has its representative in the Ber- 

 mudian fauna. I feel satisfied that many more forms are 

 common to the east and west coasts of America than is 

 generally assumed to be the case. 



There appears to have been no systematic determination of 

 the Bermudian Crustacea prior to our visit to the islands. 

 The collections made by us are not extensive, but probably a 

 full half of the species which they contain are now for the 

 first time recorded from the archipelago. By far the greater 



