The Occtjbkence or the Genus Conoclypus in the North-West 75 
Division, W.A. 
2.— THE OCCURRENCE OF THE GENUS 
CONOCLYPUS IN THE NORTH-WEST DIVISION, 
WESTERN AUSTRALIA. 
By Irene Crespin, B.A., Commonwealth Palaeontologist.. 
Read 9th September, 1941 ; Published 21st May, 1943^ 
Communicated by Professor E, de C. Clarke. 
In 1939, Mr. E. A. Rndd, M.Sc., when associated with Oil Search, Ltd., 
of Sydney, collected three specimens of a large echinoid from the east flank 
Cape Range, Exmoiith Gulf Station, North-west Australia, whilst further 
examples were recently discovered in the same region by geologists attached 
to Caltex (Australia) Oil Development Pty., Ltd. All specimens have kindly 
been made available for examination. The tests are embedded in a pink to 
ochreous limestone containing species of Lepidocyclinae characteristic of the 
Middle Miocene in the Indo-Pacific. The form has been determined as Cono- 
clypus, a rare genus only previously recorded from the Eocene in areas outside 
Australia. 
The occurrence of Conoclypus, according to Morley Davies (1935) is 
“ widespread in the Cretaceous, but unknown in Cainozoic of America or 
Australia.” It is recorded from the Eocene of India, Egypt, Madagascar, 
Mozambique, and Persia, as well as from countries in southern Europe. “ Its 
geological range thus follows the large Nummulites and like them, it never 
reached America and is apparently extinct after Middle Eocene.” 
All specimens are in the Commonwealth ‘Palaeontological Collection ^ 
Canberra, Australia. The photographs of the types were taken by Dr. F. W. 
Clements, Australian Institute of Anatomy, Canberra. 
DESCRIPTION OF SPECIES. 
Plate I., figs 1—3. 
Class ECHINOIDEA Brown. 
Order HOLECTYPOIDA. 
Family ECHINONEIDAE. 
Genus CONOCLYPUS Agassiz. 
Conoclypus westraliensis sp. nov. 
Holotype . — Although a specimen has been selected as a holotype, the 
species cannot be fully described without referring to characters which are 
better illustrated in further specimens. 
Test moderately large, almost circular in outline, broadest beliind apical 
system above periproct ; moderately convex to subconical on aboral surface,, 
with a flat adoral face. Entire test covered with small tubercules sunken 
in rounded scrobicules. Apical system slightly praecentral or forward. 
Ambulacral and interambulacral plates only visible in worn specimens. 
Genital plate distinct with four genital pores. The two pore fields, which 
outline the five petals, are petaloid in shape. The pore fields, wliich are com- 
posed of pore pairs of the dot and dash type, in wLich one pore becomes slit- 
