Late Cenozoic Ostracodes — Holden 
17 
valves; 2 entire), and from Easter Island at 
EA-2 (3 valves). Found living at Clipperton 
Island and by Brady (1890) "between tide 
marks” at Levuka and Rambe islands in the Fiji 
Islands. 
discussion: The size and shape of the 
Hawaiian specimens appear identical to Ponto- 
cypris gracilis Brady, 1890 from the Fiji Islands. 
However, the species is here assigned to the 
genus Macrocypris on the basis of its shape, 
smooth margins, valve overlap, and affinities to 
living Macrocypris in the Hawaiian Islands as 
seen by the writer. 
The carapace of Macrocypris is most readily 
confused with that of Paracypris, but differs 
primarily by having a larger right valve, dis- 
tinct dentition, and more abundant adductor 
muscle scars. 
A feature commonly overlooked in discus- 
sions of Macrocypris is the dorsal overlap of 
the right valve by the otherwise smaller left 
valve. This characteristic is apparent in illus- 
trations of the type species and also occurs in 
Macrocypris gracilis (Brady), 1890. 
Superfamily cypridacea Baird, 1845 
Family propontocyprididae Muller, 1894 
Genus Propontocypris Sylvester-Bradley, 1947 
Propontocypris simplex (Brady), 1880 
Figs. 10 a-b 
Pontocypris simplex (Brady), 1880. Rept. 
Voyage Challenger , Zool. 1, pt. 3, p. 37, pi. 
1, figs. 5 a-d. 
diagnosis: Broadly and evenly rounded dor- 
sum; concave anteroventer ; laterally flattened 
valves. 
description: In lateral view: carapace some- 
what stout; height almost half the length; dor- 
sal margin broadly arched, greatest height just 
anterior to middle; anterior margin obliquely 
rounded, ventrally extended ; ventral margin 
concave in anterior half, convex in posterior 
half ; posterior pointed ; right valve larger, over- 
reaching left valve everywhere except at mid- 
dorsum where left valve overlaps right valve; 
surface smooth; eye tubercles absent. In dorsal 
view: width about one-third the length; sides 
flattened; ends bluntly pointed. Internal fea- 
tures not observed. 
Fig. 10. Propontocypris simplex (Brady), 1880. a-b, Plesiotype usnm 648716; a, dorsal view of carapace 
showing overlap; b, left valve view of carapace showing overlap of right valve. 
