46 ~~ + LIVERPOOL BIOLOGICAL SOCIETY. — 
F. siliquosus in its lower part, along with many shell fish; 
(3) “regio Corallinarum,”’ with Corallina officinalis, many 
ascidians, sea-anemones, molluscs, worms and sponges; 
and (4) ‘‘regio Laminariarum,”’ with nudibranchs, star- 
fishes, ascidians, Helcion, Caprella, Nymphon and Hchint. 
The close correspondence between this classification and 
that of the French observers is very remarkable. 
Ten years later A. 8. Orsted, in an important essay,* 
showed that in the Strait of Oresund, near Copenhagen, 
three zones could be distinguished, both by the charac- 
teristic plants and the animals. To these he gave the 
names :—(1) ‘‘ Regio Chlorospermearum,”’ the belt of green 
sea weeds, extending from high water mark down to a 
depth of two to five fathoms, and corresponding to the 
“Regio Trochoideorum’”’ amongst animals. The upper 
part of this zone is the subregion of the Oscillatorias, and 
the lower part the subregion of the Ulvas and Confervas. 
(2) is ‘Regio Melanospermearum,”’ the belt of olive-brown 
sea-weeds, extending down to depths of seven or eight 
fathoms, and corresponding to the ‘‘ Regio Gymnobran- 
chiorum’’ amongst animals. Here also there are two 
subregions, an upper of Fucoids and Zostera, and a 
lower of Laminaria. (8) is “Regio Rhodospermearum,”’ 
the belt of purple-red sea-weeds, extending from eight to 
twenty fathoms, and corresponding to the ‘‘ Regio Buc- 
cinoideorum’’ amongst animals. As Vaillant has since 
pointed out, the somewhat abnormal conditions of marine 
life in the landlocked Strait of Oresund may account for 
the want of exact correspondence between these zones and 
those established on the more exposed coasts of France and 
Norway, but Orsted’s first region evidently corresponds to 
the three upper zones of the French observers. 
’ 
* De Regionibus Marinis. Havnie, 1844. 
