THE CAINOZOIC CIDARIDAE OF AUSTRALIA. 
of the interambulacral median area ; the conjugate pores and 
the characteristic spines. 
We have much pleasure in naming this species after Dr. 
H. Lyman Clark who assisted us both by his personal advice and 
publications. 
Localities. — Victoria — Brown’s Creek, Cape Otway district (“H.”). South 
Australia — Morgan, Murray River Cliffs, about 12 feet above river level 
(“C.” ; syntype, and paratypes — 6 spines, all C.). Murray River, lower beds, 
eighth cliff below Overland Corner, left bank (syntype, C.). Overland Corner, 
Murray River, lower beds (C.). Wongulla district, Murray River, lower beds 
(“C.”)- 
Range. — Upper Oligocene to Miocene. 
Club-shaped Spines, incertae sedis. 
Plate XIV, figs. 25, 26a, b. 
We have failed to correlate certain cidaroid spines with any 
of the above species. 
Short club-shaped spines with slightly expanded tips and 
ornamented with linearly arranged granules are rare except at 
Booanya, Western Australia, where 985 specimens were collected 
and presented to the National Museum by Miss A. E. Baesjou. 
Mortensen (1928, fig. 46) figures tests of Prionocidaris and 
Stereocidaris exhibiting spines which tend to become club-shaped, 
but evidence concerning the spines here considered does not 
justify correlation with species of those genera described by us, 
of which only Phyllacanthus duncani occurs at Booanya. Two 
long spines, bearing some resemblance to the small club-shaped 
spines in ornamentation have been collected with them at 
Waurn Ponds (“H”) and near the Glenelg River (“C.P.C.”). 
The great abundance of clubs at Booanya and the absence of 
identically ornamented slender spines from the collection made 
there suggest genera which bore club-shaped spines only, as 
for example in Eucidaris, a genus now living in Northern 
Australia. We hope to elucidate this problem by comparing 
sections of these fossil spines with other Australian forms and 
by additional field evidence. 
Localities.- — Victoria — Waurn Ponds, Geelong (C. ; “C.”). Near Glenelg 
River, Parish of Wataepoolan (“C.P.C.”). Point Addis (“C.”). South 
Australia — Mt. Gambier (“C.”). Western Australia — Booanya, near Balla- 
donia (N.M.). 
Range. — Miocene. 
Smooth Spines, incertae sedis. 
Plate XIV, fig. 24. 
The spines are typically smooth and colour-banded ; towards 
the apex some have several very faint lines of prickles and more 
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