182 
RECORDS OF THE AUSTRALIAN MUSEUM. 
and from the examination of several actual specimens, I believe 
the separation will hold good. It is also necessary to make the 
same remark on Dana’s figure] he certainly describes S. costata 
plainly enough, but his illustration represents the form or con- 
dition known as S. compressa without a doubt. 
The characters of S. compressa are practically those of S. costata , 
with the following exceptions : — The shell is rather more com- 
pressed, ligamentary pits of the hinge larger, anterior adductor 
scars subdivided by a groove, posterior adductor scars much 
transversely elongated, and an entire absence of the radiating 
posterior costae. The general characters are so much alike in the 
two, that 1 shall look forward with much curiosity to future 
descriptions of these shells. 
Loc. and Hor. — Jamberoo, and Black Head, Illawarra District 
— Upper Marine Series. 
Stutchburia simplex, Dana , sp. 
Modiolopsis simplex , Dana, Am. Journ. Sci., iv., 1847, p. 159. 
Cypricardia simplex , Dana, Wilkes’ U, S. Explor. Exped., x., 
1849, p. 703, pi. 9, f. 2. 
Obs. — Four shells in our collection correspond in outline and 
size with the above species of Dana’s, but with the internal 
characters agreeing in every respect with those of Stutchburia , as 
for instance those of the hinge, adductor impressions, and palial 
lines. The only points of departure are the size, a more truly 
oblong shape, and the exterior simple, sub-plicate, and not at all 
radiate. In the absence of Dana’s type, it is, of course, impossible 
to speak with certainty, but I am strongly of opinion that his 
species appertains to the present genus. 
Loc. arid Hor. — Wollongong, Illawarra District; Jervis Bay, 
Shoalhaven District. — Upper Marine Series. 
Stutchburia farleyensis, sp. nov. 
(PI. xxxii., figs. 3 - 6.) 
Sp. Char. — Shell transversely elongated, oblong to almost 
quadrangular, moderately compressed, average length one and three 
quarter inches, breadth one inch ; dorsal and ventral margins 
sub-parallel, the former straight, and not quite as long as the vales, 
the latter slightly insinuated near the middle, and expanding 
posteriorly; anterior ends very small, margins slightly oblique from 
the umbones downwards, but in some examples almost straight 
walled ; posterior ends much compressed, margins well and gently 
rounded ; valves most convex about widway between the umbones 
and posterior termination of the hinge lines ; posterior ridges very 
obtuse, dying out on the compressed posterior ends, above and 
