XVII 



This list contains the names of 210 species. Of these, however, 30 have not been 

 observed as yet in the Malay Archipelago. It seems certain that at least part of them will be found 

 there eventually, for these species inhabit the south-eastern part of Asia, which has numerous species 

 in common with the said Archipelago. Of course, the same is the case, at least to a certain 

 extent, with the Malay Archipelago and the seas of Eastern-Asia' (China, Japan, etc.) to the North 

 of the region, and of Australia to the South of it. Yet there is an important difference between 

 the latter regions and the Malay Archipelago : while they both extend from the tropical and 

 sub-tropical regions far into the temperate zone, and, in consequence, are also inhabited by 

 several species which are peculiar to the latter, the vvhole of the Malay Archipelago lies 

 below the tropics. Nevertheless, the list of species representing the fauna of the latter region 

 combined with that of Southern-Asia contains the names of several species, the distribution of 

 which can be foliowed either into Australia or into the waters of China, Japan, etc. 



When discussing the geographical distribution of the species of Cirripedia, we commonly 

 leave out of consideration those species that always are found to live attached to floating 

 objects, drift wood, ships'-bottoms, and the like. Their distribution is generally supposed to be a 

 very wide one, if not always a cosmopolitan one. In fact, some of these species are observed 

 all over the world's surface, as for example several species of Lepas and ConcJioderma; but 

 other species of the genus Lepas have a more or less limited distribution, so far as our 

 knowledge goes at present. This seems to be the case also with several species of Cirripedia 

 that are sometimes found attached to floating objects, but which live also on rocks, stones, 

 shells, etc. and are collected even at not quite unimportant depths: Balanus tintinnaöulumlArax., 

 B. amphitrite Darwin, and B. amaryllis Darwin are good examples of this case. They have no 

 doubt a wide distribution, yet they are observed only in warmer, temperate, and tropical seas. 

 Again, we know species that are found on ships'-bottoms, which are also dredged either in 

 shallow or in relatively deep water, and have a wide distribution in the temperate zone, but 

 which do not seem to be altogether absent from warmer seas. Such species are B. improvisus 



