18 
PACIFIC SCIENCE, VoL XXI, January 1967 
DIMENSIONS : 
PLESIOTYPE LENGTH HEIGHT WIDTH 
usnm 648716 
(entire) T-12 0.55 0.26 0.20 
SDNH 1040 
(right valve) T-12 0.62 0.24 0.14 
distribution: As fossils from T-12 (2 en- 
tire) and Easter Island at EA-2 (1 entire). 
Reported living from 7 fathoms at Ascension 
Island, South Atlantic by Brady (1880). 
discussion: Only two carapaces were found 
from the fossil stations in the Hawaiian Islands, 
but the general shape and nature of valve over- 
lap agrees with Brady’s Recent species from the 
South Atlantic. This is the only report of this 
species in the Pacific Ocean. 
Propontocypris simplex differs from the type 
species, Propontocypris trigonella (Sars), 1866, 
by having a broadly rounded dorsum, partially 
concave venter, and a somewhat pointed pos- 
terior in lateral view. 
Propontocypris (?) sp. 
Figs. 11 a-b 
description: In lateral view: length about 
twice the height, greatest height central; dor- 
sum broadly rounded, anterior half evenly 
rounded, posterior half irregularly rounded ; 
ventral margin greatly concave in anterior three- 
fourths, convex in posterior quarter; anterior 
margin evenly rounded, ventrally extended; 
posterior margin narrowly rounded ; right valve 
apparently overlapping left valve. In dorsal 
view: carapace narrow, length three times 
width; terminally acuminate; sides rounded. 
Internal features not observed. 
dimensions: 
SPECIMEN LENGTH WIDTH HEIGHT 
USNM 648717 
(left valve) T-12 0.57 0.10 0.30 
USNM 648718 
(entire young) T-12 0.47 0.15 0.24 
Fig. 11. Propontocypris (?) sp. a-b, Specimen usnm 648717; a, dorsal view of left valve; b, lateral view. 
