291 
many of the islands of the North Australian Coast and 
Polynesia. 
The Order GRALLA, or Waders, numbers about 80 
species, but they do not differ so much from those of the 
rest of the world as in the preceding Orders. The most 
noticeable genera are Hsacus, Porphyrio, and Tribonyx. 
The ANSERES, or Natatores, number about 150 species in 
Australia, but present few local or distinctive characters. The 
ANATID#& are represented by one Swan (a black one), and 
about 20 species of Ducks. The genus Cercopsis is Australian, 
and so is Anseranas. Biziura isalso a remarkable form. The 
Gannets, Cormorants, Darter, and Pelican are, with the excep- 
tion perhaps of the last, the same the wide world over. The 
Frigate and the Tropic Bird aré found in the warm seas of the 
north. The Procellaride ave numerous at sea, the Laride 
and Sternide on the shore. Divers and Grebes are numerous, 
and in the extreme south the Penguins make their appearance. 
Indeed it may be said that all the Ocean Birds, trom the ALcIDz& 
of the Antarctic Regions to the Pa: ropon Lip of the Tropics, 
are to be found within the circuit of the Australian Seas. 
The STRUTHIONES form an Order of which there are 
few living species; and of the five known living genera— 
Struthio, “Rhea, Dromaius, Casuarius, and Apteryx—two are 
exclusively of the Australian Region. The genus Dromaius 
(the Emu) consists of two species, one of Eastern and one of 
Western Australia. The otber genus, Caswarius (the Casso- 
wary), comprising one Australian species, is also found in 
New Guinea and New Caledonia. 
In the Third Class of the Vertebrata, the Reptilia, Australia 
sustains in a marked manner its distinctive character. The 
CHELONIA are, with the exception of the marine TEsTU- 
pINz#, or Turtles, which are common to all the seas of the 
Tropical Ocean, of strictly Australian species, and are found in 
every river in the country; and though not so numerous in 
species as the Order appears to be in America, yet when well 
known they will be found to be much more numerous than is 
at present supposed. Eight species only are recorded in 
Kreff’s “ List of Australian Vertebrata,” published several 
year's ago, belonging to the genera Chelodina, Chlamys, Hlseya, 
all solely Australian, 
The CROCODILIA are limited in Australia to two species, 
so farasat presentknown. One of them, Crocodilus porosus, is 
common about the mouths of all the rivers of Australia within 
the line of the tropic, and indeed sometimes south of it. The 
other, Tomistonia Krefftii, a Gavial, has not been seen except 
in rivers in the vicinity of Rockingham Bay. 
