324 MR. G. KREFFT ON A NEW PETROGALE. __[Mar. 28, 
TeETRATHYRA BAIKHI, Sp. nov. 
Head olive, white-spotted. Back olive, marbled with black above ; 
the lower surface pale, irregularly black-marbled or spotted. The 
front pair of callosities small, oblong. 
Younger specimen, the head and dorsal shield pale brown, mar- 
bled with large black (often inosculating) streaks ; lower part of head 
and sternum black, with large, irregular-sized, pale spots, some of 
which are symmetrical. 
Hab. West Africa, River Niger? 
The largest specimen, which is not full-grown, is 11 inches long ; 
the dorsal shield 7 inches long and 5 inches wide. 
Lower surface of Tetrathyra baikii. 
5. Description oF A New Species oF Rock-KANGAROO FROM 
New Soutu Waters. By Gerarp Krerrt, CuRATOR AND 
Secretary, AUSTRALIAN Museum, Sypney, N.S. WAtes. 
PETROGALE LONGICAUDA, Sp. nov. 
Hair remarkably soft and long (3 inches in length upon the back 
and sides), dark grey at the base, tipped with pale yellow and 
black, giving the fur a mottled appearance. Head and neck grey, 
a lighter patch extending from the base of the ears to the nostrils. 
Ears grey at the base; black at the tip ; sides slightly fringed with 
yellow. Shoulders and fore legs dark grey, grizzled with white, 
which colour extends to about the middle of the body. The hair of 
the back and haunches is of much longer growth, silky to the 
touch, of a mottled brownish-grey colour, and changing into rusty 
