76 
Irene Crespin. 
like, are wide, extending from apex to ambitus, and converging towards apex 
and peristome. Peristome on adoral surface, central and pentagonal, with 
five interambulacral bourrelets, representing the rounded blunt projections 
from each ambulacrum adjacent to the peristome, and five ambulacral 
phyllodes, representing the ambiilacral pores. The phyllodes indicate tlie 
petaloid arrangement developed on the aboral surface, and are distinct on one 
specimen. The five bourrelets and five phyllodes form the floscelle. The 
periproct is on adoral surface at posterior end of test in the fifth interambulacral 
area close to ambitus. 
Dhne'nsio7is. — Height — Holotype, 49 mm. ; Paratype, 41*5 mm. ; Plesio- 
types, (1) 41 mm., (2) 41*5 mm. Diameter of adoral surface from periproct 
to 3rd ambulacral— Holotype, 74 mm. ; Paratype, 70*5 mm. ; Plesiotypes, 
(1) 61 mm., (2) 66 mm. 
Occurrence. — Holotype, Gorge east flank of Cape range, west of Exmouth 
Gulf Outcamp, North-west Division, Western Australia, coll. E. A. Rudd. 
(Com. Pal. Coll. No. 184). Paratype, same locality as holotype. (Com. Pal. 
Coll. No. 185). Plesiotypes, Open gorge, north of Mt. King, Cape range, coll. 
E. A. Rudd ; 4-7 miles from mouth of Badjirrajirra Creek, Exmouth Gulf, 
coll. Caltex (Australia) Oil Development Pty., Ltd. (Com. Pal. Coll. Nos. 
186, 187). 
Ohservatioyis.—Morlej Davies states that “ the genus is remarkable in 
having jaws of a Holectypoid, tlie Cassidulinoifl floscelle and Clypeastroid 
petals.” The genus is typically represented in C. westralicnsis, the four 
specimens availal:)le for examination being uniform in shape but varying in 
height and diameter. Tate, in 1893, describetl from the Tertiary beds at 
Table Capo, Tasmania, an ecliinoid under the name of Conoclypens rostratus. 
The specimen, which is in the Tate Museum, Geology Department, University 
of Adelaide, has beoai re-examined, and belongs to the genus Echino layy^jnis. 
At the time wlien Tate describcnl his form, the beds at Table Cape were con- 
sidered Eocene in age, but they are now referretl to the Miocene, being most 
probably Middle Miocene. Tlie limestone in which C. westraliensis is found, 
contains a foraminiferal assemblage typical of the Middle Miocene in the 
Indo-Pacific region and includes such forms as C ycloclypcus posteidae Tan 
and Lepidocycliyia (Tryhliolepidina) ynartini (Schlumberger). There is, there- 
fore, little doubt that the genus ranges to a much liigher horizon in the Tertiary 
in the Tndo-Pacific region than previously considered. 
REFERENCES. 
Agassiz, L., and Desor, E., 1847. Catalogue raisonne des families, genres, et des especes 
de la classe des echinides. Ann,. Sci. Nat. (3), Zool. 8, p. 167. 
Davies, Morley A., 1934-1935. Tertiary Faunas. Vol. X.. II. 
Tate, R.. 1893. Unrecorded Genera of the Older Tertiary Fauna. Journ. Hoy. Soc. N.S.W 
27, pp. 167-197. 
Wright, T., 1857. A Monograph on the Britisli Fossil Eehinoderinata from the Oolitic 
Formations. Part III. Pal. Soc. London, 9. 
DESCRIPTION OF PLATE. 
All figures f natural size. 
Figs. 1-3. Conoclypus westraliensis sp. nov., Cape Range, Exmouth Gulf Station, North 
west Division, Western Australia. 
,, 1. Side view of Holotype, showing typical Conoclypus shape and characteristi 
surface ornamentation. 
„ 2. Adoral surface of paratype, showing peristome, periproct, 5 interambulacr^ 
bourrelets and 5 ambulacral phyllodes, 
„ 3. Aboral surface of holotype, showing 4 genital pores and slightly praecentral 
apical system. 
. 
a 
