. Among them was the Helix barbula, an
Asturian species, Helix pauperata, and Bulimus variatus, Madeiran or
Canarian forms. A considerable number of marine and terrestrial Testacea
were procured at Rio de Janeiro, not a few of them new and of great
interest. Terebratula rosea was dredged off Rio in thirteen fathoms
water, on a coarse sandy bottom. Collections were also made at the Cape
of Good Hope, at Mauritius and in the Falkland Isles. The radiata were
gathered with as much care and their habitats recorded with as much
attention as the Mollusca.)

It may here be remarked that the Molluscan fauna of the seas of North
Australia and of the north-east coast from Cape York southwards to Sandy
Cape, belongs to the great Indo-Pacific province, a zoological region
extending from the east coast of Africa (from Port Natal or a little
above, northwards to Suez) to Easter Island in the Pacific. But south of
Sandy Cape and onwards to Van Diemen's Land (and apparently including New
Zealand) we have a distinct (East)Australian province, marked by a
peculiar fauna in many respects, representative of the Senegal, and
perhaps also Lusitanian regions of the North Atlantic.

Proceeding in descending order we may first remark on the:

SHELLS OF SALT MARSHES.

As in the Northern hemisphere, Melampus or Convolvulus is the genus
represented in such localities. Thus Auricula australis prevails in salt
marshes at Brisbane Water, and an allied species in similar places in New
Zealand. In both instances we find this form accompanied by members of a
curious genus characteristic of the Australian province--Ampullacera, the
Ampullacera quoyana being the Brisbane Water species, and A. avellana,
that of New Zealand. In the latter case an Assiminea is its companion. A
very curious fact noted during the expedition was the presence of a Unio
living within the influence of salt water, in the River Brisbane.

SHELLS INHABIT MUD, ETC. AMONG MANGROVES.

These belong to the Indo-Pacific province. Some are found on the
mangroves themselves. Such are the Littorina scabra, on the trunks and
branches of mangroves among islets in Trinity Bay; a Phasianella
inhabiting the trunks and branches of Rhizophora at the Percy Isles; a
Littorina on the leaves of Aigaeceras fragrans at Port Curtis, Auricula
angulata, and rugulata on the trunks of mangroves at Port Essington, and
Monodonta viridis on their roots at Night Island; a new and very
beautiful Ostrea was fou