84 
RECORDS OF THE AUSTRALIAN MUSEUM. 
DESCRIPTION of a NEW BIVALWE, LIMA ALATA , from 
SANTA CRUZ. 
By C. Hedley, Conchologist. 
Shell large, thick and 
strong, colour uncertain, 
in outline but slightly 
oblique, subelliptical, 
sharply truncate above 
and roundly produced 
below, in transverse sec- 
tion moderately rounded, 
in breadth two-thirds the 
length. Hinge line long, 
a third of the length of the 
valve, nearly straight, set 
at about an angle of thirty - 
five degrees to the median 
line of the valve. The 
narrow and shallow liga- 
mental area is overhung 
by the small, sharp, pro- 
duced umbo. The anterior 
auricle is enormously de- 
veloped, thickened, reflec- 
ted, and sharply and 
strongly recurved; the 
posterior is straight and 
moderately developed. The 
exterior is everywhere 
regularly f u r rowed by 
numerous small grooves 
equal to their interstices. 
These are about a hundred in number, are deepest and broadest 
on the auricles and above, finest on the centre of the valve. 
They diverge at a small angle on each side of a median line ; trans- 
versely concentric growth lines indent and distort them. 
Length, 70 mm.; breadth 50 mm. 
Locality . — Santa Cruz, S. Pacific. 
Type . — Australian Museum. 
The material for the preceding description is a single, rather 
worn and discolored right valve, collected by Mr. J. Jennings on 
