THE CAINOZOIC CIDARIDAE OF AUSTRALIA. 
In the following pages five genera and eight species of 
Tertiary Cidaridae are recognised, including 7 new species. 
The only cidaroid remains recorded from pre-Cainozoic strata 
in Australia are portion of a test of Cidaris comptoni (Glauert, 
1923, p. 48), cidaroid spines indeterminate (Eth. fil.) from the 
Cretaceous of Gingin, W.A., and a fragmentary spine of Cidaris 
sp. (Whitehouse, 1925, p. 1) from the Jurassic east of Geraldton, 
W.A. 
The geological map of Cape Otway district, Victoria, referred 
to in lists of localities, is Wilkinson’s, published in 1865. 
Class ECHINOIDEA. 
Order Cidaroida Duncan. 
Family CIDARIDAE Gray. 
Genus STEREOCIDARIS Pomel 1883. 
This genus has non-conjugate pores (Mortensen, 1928) ; it 
was founded on fossil forms. Its history begins in the Cretaceous 
of Europe ; it also occurs in the Eocene of Europe and possibty 
of America. A fossil spine described from the Miocene of Java 
may also belong to this genus. 
Stereocidaris is found living in the Atlantic, the Indian 
Ocean, the Philippine seas and around Japan. It has not been 
recorded from the Australian region (Clark, 1925). 
Stereocidaris australiae (Duncan). 
Leiocidaris australiae Duncan, 1877, p. 45, pi. Ill, figs. 1, 2. 
? Cidaris striata Hutton, Tate, 1894, p. 122. 
Cidaris ( Stereocidaris ) australiae Duncan, Tate, 1898, p. 411. 
Plate XII, figs. l-6b ; plate XV, figs. 32a, 34-36c. 
Duncan’s original description (1877) is as follows : — “The test is greatly 
and suddenly depressed towards the actinosome. The ambulacra are slightly 
wavy, narrow, and have four vertical rows of small miliary tubercles, the 
inner rows having the smallest tubercles ; and the poriferous zones are sunken, 
the pores being conjugate, and each pair separated from its neighbours by a 
distinct ridge. The interambulacral tubercles are few in number, and most 
are very large ; the perforate mamelon is small in relation to the plain, large, 
conical and well-developed boss. The scrobicule is deeply sunken, elliptical, 
and is overhung by the scrobicular circle which slopes down to the suture, being 
ornamented by radiating rows of two or three very small tubercles. The 
median interambulacral space is sunken, and the vertical sutures of the plates 
are distinctly marked by a lower space, which is in a zigzag from above down- 
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