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1. CHELYDRA. 
Head moderate, rather depressed, covered with a soft skin, chin 
bearded, neck granular; back with two slight keels; marginal plates 
in a single series. 
Chelydra serpentina. 
2. Macrocue ys. 
Head large, angular, contracted in front, covered with symmetrical 
horny plates, neck with several series of spinose warts; back with 
three sharp continued tubercular keels; the lateral marginal plates 
in a double series. 
M. Temminckii. 
Fam. II. Curtypipz. 
When Australia was first visited by Sir Joseph Banks, he brought 
home with him from New Holland a freshwater Tortoise, which Dr. 
Shaw described under the name of Testudo longicollis. This has 
been made the type of the genus CHELopINA. Recent travellers in 
Australia have shown that the genus is distributed over the country ; 
each part appears to have a species peculiar to itself. In Capt., 
now Sir George Grey’s Travels, I described and figured a species from 
Western Australia under the name of Chelodina oblonga. Ina col- 
lection which we have lately received from Haslar Hospital, there 
are two very large specimens of the genus sent from Swan River 
by the late Mr. Collie, which, though similar in several respects to 
Chelodina oblonga, may be considered as a distinct species, which 
I shall proceed to shortly characterize. 
The species of the genus hitherto described have the thorax 
covered with very thin smooth shields, so transparent that a peculiar 
black reticulated appearance, which exists between the shields and 
the bones of the thorax, can be distinctly seen through them. This 
character is common to C. longicollis of New Holland, C. oblonga, and 
Mr. Collie’s species from Swan River, which I propose to call, in 
honour of my late friend and excellent collector— 
1. CaELopi1na Couuiet. 
The shield oblong, elongate, contracted and revolute on the sides ; 
under side uniform pale yellow. 
Hab. Swan River, Alewander Collie, Esq. 
This species agrees with C. oblonga in the uniform colour of the 
back and sternum, which is only varied by the dark lines of the netted 
appearance before referred to; but it is easily known from that species 
by its larger size, the much narrower shape, and the lateral margin 
becoming strongly revolute, and the edge over the hinder limb raised 
up and rather expanded. 
The British Museum have lately received, with some other speci- 
mens, from the Australian continent—but unfortunately the special 
habitat was not indicated—the shell of a Tortoise which has all the 
characters of the genus as at present defined, except that, instead of 
