16 
PACIFIC SCIENCE, Vol. XXI, January 1967 
valves). Reported living by Brady (1880) in 
the Hawaiian Islands at 40 fathoms, and by 
Brady (1890) from tide pools in Samoa. 
discussion : Brady noted that Bairdia expansa 
occurred with B. amygdaloides (=B. kauai- 
ensis), and B. crosskeiana of Brady, 1880 and 
B. attenuata. Its fossil bairdiid association is 
somewhat different, being with abundant B. 
kauaiensis, common B. ritugerda, rare B. attenu- 
ata and B. hanaumaenis . Bairdia crosskeiana has 
not been found as a fossil from the Hawaiian 
Islands. 
Macrocypris gracilis (Brady), 1890 
Figs. 9 a—b 
Pontocypris gracilis Brady, 1890. Trans. Roy. 
Soc. Edinburgh 35, p. 491, pi. 1, figs. 5-6. 
diagnosis: Low, elongate, inflated carapace; 
slightly to moderately concave venter; broadly, 
evenly arched dorsum. 
description: In lateral view: carapace elon- 
gate, length about three times the height; right 
valve overlapping smaller left valve everywhere 
except at mid-dorsum; dorsal margin broadly 
but evenly arched; anterior margin rounded, 
ventrally extended ; ventral margin almost 
straight, slightly concave at midlength; pointed 
posterior near venter; surface smooth. In dor- 
sal view: carapace narrow, length about three 
and a half times width; terminally acuminate 
with equal posterior and anterior angulation. 
Internal features not observed. 
dimensions : 
PLESIOTYPE 
LENGTH 
WIDTH 
HEIGHT 
USNM 648715 
(entire) T-4 
1.06 
0.32 
0.39 
SDNH 1039 
(right valve) T-4 
0.95 
0.18 
0.39 
distribution: As 
fossils 
from 
T-l (2 
valves), T-4 (1 valve: 
: 1 entire), and T-7 (3 
Fig. 9- Macrocypris gracilis (Brady), 1890. a—b, Plesiotype usnm 648715; a, lateral left valve view of 
entire carapace showing overlap of right valve; b, dorsal view. 
