6 . 
Thi South Australian Naturalist. 
I SHELL COLLECTORS’ CLUB. 
k 
; Bivalves have been further investigated during the quarter, 
i and members are indebted to Sir Joseph Verco for his invaluable 
!- assistance in giving the Club access to his revision of South 
Australian Bivalves. The completion of this work should do 
much towards clearing up many doubtful points, and place our 
new shell students in a much more satisfactory position. Among 
the specimens dealt with were: — 
.[ Laternula creccina, formerly Anatina; and Cochlodesnia 
I Angasi, 
The Anatina take their name from a fanciful resemblance to 
the spoon-shaped duck’s bill. They are silvery-white, fragile, 
toothless-hinged shells, with a prominent gape, which permits the 
exit of the large siphon. L. creccina may be found in the mud 
' flats of the Port Adelaide River. C, Angasi is a more rotund 
‘ shell, with many of the characteristics of the former. Splendid 
living specimens have been collected by our members on the 
, ; beaches of Yorke Peninsula. 
Cras satellites Kingicola. This the largest S.A. bivalve, and 
I i specimens were shown weighing up to 9 or 10 ounces. Of very 
massive construction, it has glistening white, porcellaneous in- 
terior tinged with salmon. The shell carries a thick brown, per- 
iostracum, usually abraded at the umbo. The animal adds im- 
t , mensely to the thickness of its valves during adult life at the ex- 
'i pense of a general contraction of its living space. Many sub- 
,1 fossil valves of this species have been collected at the Outer 
Harbor. It is found alive at Port Lincoln and may also be 
! , dredged in a restricted area in other parts. 
Bassina Disjecta (formerly Cytheria) is our most beautiful 
bivalve, and^much sought for cabinet exhibition and foreign ex- 
I 1 change. It is obtainable at Kangaroo Island, Port Lincoln and 
; occasionally at the Outer Harbor. Its prominent, symmetrical 
I and delicately ridged valves no doubt play an important part in 
|.' anchoring it safely in the sand from the effects of tide wash. 
I ^ Ephippodonta Lunata. This small bivalve lives exclusively 
'i ‘ in the burrow of a certain prawn, with its half-moon valves per- 
manently opened out flat, and, with a living sponge at the door 
I of the burrow, ail live in an apparently happy state of commen- 
t._ salism — each dependent on the other. This species collected near 
| i Edithburgh and at Port Wiliunga, was described and named by 
i I the late Professor Tate. 
November 12th, 1925. 
I 
E. TRIGG, Hon. Sec, Shell Club. 
