XVIII 
Darwin, and &. crenatus Brug., of which the latter ranges even into the Arctic Ocean. 
Altogether, the distribution of these species is not only a wide one, but at the same time a 
peculiar one, both species having the capability of resisting extreme conditions. 
Coming now to those species that are always found attached to objects — stones, 
rocks, shells, corals — of the sea-bottom, we are strongly impressed by the facts, (1) that by 
far the greater part have only a very limited distribution, and (2) that only very few species 
are known which inhabit this East Indian region, and are found also in the Atlantic Ocean. 
With regard to the limited distribution of the majority of the species, we must not 
forget that the species from deeper water form a high percentage of our list, and that, to say 
the least, we are not so well informed with respect to the distribution of those species. If we 
take the genus Sca/fe//um, represented in this province — so far as our knowledge goes at 
present — by 63 species, we know of only 8 of these species occurring also outside the 
province. Three of these were observed in Japan waters, and three in Australia, one was taken 
in the southern part of the Indian Ocean (between the Crozets and Prince Edward Island), and . 
only one quite outside the region: at different places in the Atlantic, etc. This latter species 
is Scalpellum acutum mihi. It is a small species — but an interesting one. The “Challenger” 
dredged it at: 
Station 78. Near the Azores at a depth of 1800 m. 
170. Near Kernadec Isl., Pacific, at depths of 936 and 1134 m. 
” 
The “Talisman” took it: 
near the coast of Portugal at a depth of 1923 m. 
The “Investigator” found it: 
Andaman Sea, at a depth of 882 m. 
and finally the “Siboga” met with it again at: 
Station 122. North of Menado (Celebes), at a depth of 1165—1264 m. 
E 151. W. of Waigeu Island, at a depth of 845 m. 
211. N. of Saleyer Islands, at a depth of 1158 m. 
On 
” 
It is the only species of Sca/fel/um known to have such a world-wide distribution, and 
it is a true deep-sea species. The only other deep-water Cirripedia that were observed in 
the Malay Archipelago and in the Atlantic Ocean as well, are two species of Poece/asma. 
The first is Poectlasma carinatum Hoek. The “Challenger” collected it on two occasions, viz. 
Station 24. Off Culebra (West Indies). Depth 7oo m. 
: 344. Off Ascension Island (South Atlantic). Depth 756 m. 
GRUVEL mentions specimens taken at a depth of 600—g00 m. near the coast of Cuba. 
The “Michaél Sars” (Atlantic Expedition of 1910) met with the same species at: 
Station 53. S. of the Azores. Depth 2615—2865 m. 
The “Siboga” collected it at the following stations: 
Station 177. Ceram Sea. Depth 1633 m. 
: 284. S. of Timor. Depth 828 m. 
The other species of Poeci/asma that seems to inhabit both oceans is Darwin's Poectlasma 
