nd on the roots of mangroves among Low Islets in
Trinity Bay. In the last-named locality a Cytherea inhabited the mud
around their roots. At the Three Islets several new species of Melampus,
a Nerita and a Cyrena lived in a like habitat, and at Port Essington
Cerithium kieneri, was found in the same situation. The fine Cyrena
cyrenoides lives among the roots of mangroves in the Louisiade
Archipelago.

LITTORAL ZONE.

Of the many living Gasteropoda taken in this region, very few are new
species. Of Patelloid forms we have a new Fissurella and Parmophorus
convexus at Port Dalrymple, accompanied by Haliotis naevosa, and species
of Patella and Siphonaria. In the more tropical regions, Haliotis asinina
and varia, another and distinct Patella, two Fissurellae and a Scutella
were collected. Of convolute shells the littoral species gathered were
all Indo-Pacific and inhabitants of mostly the coral-reef region, such as
Cypraea arabica, annulus, isabella, errones and oryza, Conus magus,
arenatus, achatinus, etc., Oliva cruentata, tremulina and ericinus, those
of the last-named genus often living in sand. Bulla cylindrica occurred
in sandy pools on the reef at Claremont Isles. Of Volutes, V. turneri
lives on coral blocks at Port Essington, and V. undulata partially buried
in sandbanks at Port Dalrymple. Conus maculosus is an inhabitant of the
last-named locality. The Mitras found in the Littoral zone were all on
the north-east coast, and well-known Indo-Pacific forms. A new Murex was
taken on mud at Port Curtis. Fasciolaria coronata, Fusus alveolatus, and
Triton verrucosus were found on the reefs at Port Dalrymple. Many species
of Nassa, all known forms, were collected, mostly on mud in the Littoral
zone, chiefly in the north-eastern province. Phos cyanostoma lives on
muddy sand in the Trinity Bay islets, where also in similar situations is
Terebra maculata and Pyramidella maculosa. Pyramidella auriscati is a
littoral shell among the reefs of the Claremont Isles. Several Purpurae
were taken on reefs and rocks at low-water; among them was P. textiliosa,
a Port Dalrymple species. A Quoya lives on rocks being high-water mark in
Lizard Island. Several Terebrae, including T. crenulata dimidiata and
affinis, inhabit muddy sand among Pipon's Islets. The well-known Strombus
luhuanus lives on sand among the reefs at Eagle Island. A Cerithium
inhabits mud-flats at Port Molle and Pipon's Islets. Of the holostomatous
gasteropods inhabiting t