a. Long-eared Rats.

Hapalotis.

H. albipes. New South Wales, Victoria, and South Australia.

H. apicalis New South Wales, Victoria, and South Australia.

H. hemileucura. Queensland.

H. hirsutus; North Australia.

H. penicillata. North Australia,

H. conditor. New South Wales.

H. longicaudata. Western Australia.

H. Mitchellii. New South Wales, Victoria, and South Australia,

H. arboricola, New South Wales.

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b. Short-eared Rats.

Mus.

M. fuscipes. Southern Australia.

M. vellerosus. South Australia.

M. longipilis. Victoria River.

M. cervinipes. New South Wales.

M. assimilis New South Wales,

M. manicatus. Port Essington.

M. sordidus. New South Wales.

M. lineolatus. New South Wales.

M. Gouldi. From East to West coast.

M. nanus. New South Wales and Western Australia.

M. albocinereus. Western Australia.

M. novæ-hollandiæ. New South Wales.

M. delicatulus. North Australia.

M. macropus. North Australia.

M. personatus. North Australia.

c. Water Rats.

Hydromys.

H. chrysogaster. Various parts of Australia.

H. fulvolavatus. Various parts of Australia.

H. leucogaster. Various parts of Australia.

H. fuliginosus. Various parts of Australia.

H. lutrilla. Various parts of Australia.

Numerous Eats have been described according to the colour of their fur; but few authors have examined the dentition of their new creations, so that in course of time their number will probably suffer a reduction. We consider the five Water-rats to be varieties of a single species.