347 
Many previously undescribed species have been found in this 
region, viz. Calantica affinis, Scalpellopsis striatociliata, Heteralepas 
nodulosa, Verruca cristalina f. lævis, and Acasta madreporicola; each 
of these species only being recorded from one locality, it would 
be premature to try to give their biogeographic characters. On the 
other hånd, a species as f. inst. Scalpellum balanoides having pre¬ 
viously only once been caught, viz. near the Kei Islands (Hoek, 
1883), and which is now found both near Zamboanga, and in 
the Menado Bay, may be designated as a species characteristic 
of the Malay Archipelago, this might seem even more justifiable 
in a species as Megalasma striatum; Hoek (1883) described the 
species after a specimen from the Philippines, and has later (1913) 
found the species again in the „Siboga“-collections o ff Luzon, 
south of Taam Island, south of Kur Island, and east of Kei Islands; 
in the present material it again turns up south-west of Tueuran. 
Nevertheless the species also protrudes into Japanese waters, a 
single specimen occurring in material from the neighbourhood of 
Bono. On the whole, most of the species which have their geo- 
graphical centre in, and are characteristic of the Malay Archipel¬ 
ago, have their Northern limits in Japanese waters. To the same 
biogeographic category as Megalasma striatum, Scalpellum indieum, 
Acasta Dofleini, and probably also Verruca albatrossiana belong. The 
following species are evidently more strietly limited to the Malay 
Archipelago: Octolasmis orthogonica, Chtamalus moro, Balanus mi- 
nutus, Balanus proripiens, Acasta pectinipes. Acasta conica, and Te- 
traclita vitiata. On the other hånd, a species such as Balanus allium 
links the Malay region with the Australian region; we shall on a 
later occasion return to this affinity, and to that with the Hawaiian 
Islands. 
An interesting biogeographic character of the Malay Archipelago 
also pointed to by previous authors, is afforded by the abundance 
of Conopea- and /fcasta-species; they are flourishing here more 
than in any other place as far as hitherto known, and evidently 
have their centre of origin in these waters, where also Scalpellop¬ 
sis, the youngest twig of the Scalpellid branch has branched off. In 
most genera the proliferation of species and varieties also now 
seems to be more lively in the Malay Archipelago than in most 
other regions. — 
