30 
straight. Central upper cardinal of the right valve laminar and almost 
marginal, lower cardinal laminar and oblique ; anterior lateral short and 
curved, posterior lateral long, distant, and straight. Adductor impressions 
and pallial lines very faint. Sculpture of concentric laminae, with faint 
coincident lines. 
Ohs. — A very characteristic species in the White Cliffs Opal Series, 
where it occurs with the test frequently converted into both common and 
precious ojial. The general proportions of the valves and degree of inflation 
readily distinguish it from C. Meehi, mihi,^ on the one hand, and C. ? cornigata, 
Tate, sp., on the other. 
I shall not bo surprised to learn that Cyprina ? Uudlestoni, mihi," is a 
third species of Cyrenopsis. 
Loc. — White Cliffs Ojial-fiold, near Wilcannia, North-West N.S. Wales 
{IJ^ardcn ir. C. Bodgerson,^m\ F. G. de V. Gipps); A. Skipworth’s Claim, 
four feet from surface, 'White Cliffs Opal-field (C. Cullen) ; Smith’s Claim, 
AVhite Cliffs Opal-field ((7. Cullen). 
Hop . — Upper Cretaceous (AVhite Cliffs Opal Series). 
Colin . — Alining and Geological Aluseiim, Sydney; andU. G.de V. Gipps. 
Cykenopsls ? coRiiunATA, Tate, sp. 
Flatopis (.^) cornu gala , Tate, Trans. K. Soc. S. Austr., 1898, XXII, Pt. 2, p. 78, figs. p. 79. 
Ohs . — I have not seen the type of this species, from temporary 
unavoidable causes, but the many points of outward resemblance the figures 
bear to C. JMceld, mihi, and C. opallites, mihi, lead me to place it in close 
contiguity to these forms, rather than in Flatopis, AA’hitfield. C. ? corrugata 
a})pears to be peculiar in its wide and strongly-marked posterior area, and 
cuneiform outline, features much more apparent than in either of the above 
shells. 
Loc . — AA^hite Cliffs Opal-field {Tate). 
llor . — Upper Cretaceous (AVhite Cliffs Opal Series). 
Colin . — School of Alines and Industries, Adelaide, S. Australia. 
' Geol. Pal. Q’laud, &c., 189'2, t. 26, f. 1.3-15, t. 27, f. 2 and .3. 
2 Ihkl, t. 28, f. 12. 
