SOME GEOLOGICAL NOTES ON COUNTRY BEHIND JERVIS BAY. 299 
and without apparent means of attachment. It is ofa 
deep purplish-black colour, and the surface is marked with 
distinct though not prominent longitudinal strie. The 
embryo is 150 mm. in length, the tail portion being 96 mm. 
long, and the large spherical yolk-sac is 46 mm. across. 
After preservation in formalin, the embryo is white in 
colour, with twenty-six grey cross-bars over the back and 
tail, those anterior to the second dorsal fin being disposed 
in pairs. Sun-dried cases have also been forwarded by Mr. 
K. J. Banfield, from Dunk Island. 
SOME GEOLOGICAL NOTES ON COUNTRY BEHIND 
JERVIS BAY. 
By H. I. JENSEN, D. sc. 
[Read before the Royal Society of N. S. Wales, December 2, 1908. | 
In January last I spent a few weeks in the district lying 
between Nowra, Nerriga and Nelligen. Since then I have 
had an opportunity confirming several of the observations 
made by a second visit. 
Physiography.—From the Currockbilly Range’ at Sassa- 
fras the country slopes gently to the east, the altitude 
falling gradually from about 2,200 feet on the range to near 
sea-level at Jervis Bay and Nowra. The inclined plane so 
formed is dissected by numerous canons which pursue a 
north and south direction, e.g., the canons of the Httrema, 
Danjera (Tianjara Creek or Fall Creek) and Yalwal Creek 
which flow north into the Shoalhaven, and the gorge of the 
Clyde River which runs south emptying into the sea at 
‘ Pigeon House Range of Tourist Bureau Map. 
