ead.

REGION OF WEEDS EQUIVALENT TO THE LAMINARIAN REGION OF THE EUROPEAN SEAS.

Some seventeen or eighteen localities in this Bathymetrical province were
explored by means of the dredge, varying in depth from one to seventeen
fathoms. In the south-east Australian province the principal Gasteropoda
procured were Bulla brevis, at Port Jackson, in 6 fathoms; Cyprea oryza,
at Port Phillip, in 5 fathoms; Calyptraea connata, in 6 fathoms, Port
Jackson, with Nassa suturalis, and another, a new Terebra, Monotigma
casta, Mitra sordida, a Marginella, a Columbella, and Struthiolaria
oblita. A Phasianella was dredged in from 3 to 5 fathoms on sandy mud, at
Port Phillip, with Elenchus rutilus, Marginella fornicata, and Cerithium
granarium. In the North-east Australian province, a different set of
shells was dredged in similar depths, such as a Sigaretus, possibly new,
Fissurella calyculata, Mitra obeliscus, a Turritella, a Murex, Columbella
versicolor, and a new species off Cape York, Ranella pulchella, new,
several Nassae, Phos senticosa and blainvillei, and sculptilis, in 3 and
5 fathoms, off Cape York; Strombus campbelli, in mud off Cape Upstart;
Cerithium obeliscus, and a new species of the genus Obeliscus. In the
deeper localities Cypraea fimbriata occurred, dead, off Cape Capricorn;
and two species of Ranella, one being R. pusilla, in 17 fathoms, off the
Percy Isles. The univalves dredged among the Louisiade Islands in this
region of depth were mostly known forms, such as Conus betulinus, Oliva
sanguinolenta, Mitra exasperata, Terebra maculata, consors and labiata;
these were all taken in less than six fathoms water.

The bivalves of this region were but few. In the South Australian
province species of Mactra, Psammobia, Venus, Tapes and Pecten, all
peculiar, were taken. This is the region of the peculiar genus Myadora,
of which five species were dredged on sand in 6 fathoms at Port Jackson,
along with Myochama anomioides, Trigonia margaritacea, Lima bullata, and
Cardium radiatum. In the North-east Australian province we have species
of Donax, Mactra and Corbula, all apparently new, from the shallower
localities; Corbula tunicata, Pectunculus tenuicostatus, and another,
from 8 to 11 fathoms, off Cumberland Islands; species of Arca,
Pectunculus, Avicula, Pecten, Venus, Circe, Cardium, Cardita, and
Erycina, mostly new, from 15 to 17 fathoms in a sandy and shelly bottom
off Cape Capricorn.

CORALLINE ZONE.

Some dredgings i