12 
PACIFIC SCIENCE, VoE XXI, January 1967 
TABLE 4 
Dimensions of Bairdia hanaumaensis n. sp. 
SPECIMEN LENGTH WIDTH HEIGHT 
Holotype USNM 648724 (entire) HA 
Paratype usnm 648725 (right valve) HA 
Paratype SDNH 1032 (left valve) HA 
Paratype usnm 648726 (left valve) HA 
Paratype SDNH 1033 (right valve) AR 
Paratype usnm 648727 (left valve) T-12 
Paratype usnm 648728 (left valve) HA 
Paratype usnm 648729 (right valve) T-12 
Paratype usnm 648730 (entire) HA 
0.75 
0.36 
0.37 
0.69 
0.16 
0.33 
0.70 
0.19 
0.36 
0.68 
0.19 
0.34 
0.71 
0.21 
0.37 
0.69 
0.22 
0.37 
0.68 
0.19 
0.36 
0.68 
0.15 
0.34 
0.68 
0.32 
0.34 
and is not as terminally blunt in dorsal view 
as B. hanaumaensis . The tumid B. tuberculata 
from the Admiralty Islands at 16-25 fathoms, 
though roughly the same shape, is more dis- 
tinctly ornate and more inflated. The present 
species is named for Hanauma Bay, Oahu, 
Hawaii. 
Bairdia r huger da n. sp. 
Figs. 6 a-g 
diagnosis: Humped caudal process (termi- 
nating with spine in immature specimens), high 
anterocardinal angle; acuminate posterior; and 
anteriorly inflated carapace. 
description: In lateral view: carapace pos- 
Fig. 6. Bairdia ritugerda n. sp. a-b, Holotype usnm 648731; a, internal view of female left valve showing 
large vestibules; b, dorsal view, c, Paratype usnm 648732; dorsal view of male right valve showing concave 
dorsum, d, Paratype sdnh 1034; male left valve, e, Paratype sdnh 1035; penultimate left valve showing termi- 
nal spine and posteroventral serrations, f, Paratype usnm 648733; third from last instar, left valve, g , Paratype 
sdnh 1036; fourth from last instar, left valve, h—l , Bairdia crosskeiana Brady, 1866; h-k, plesiotype usnm 
648735; h, internal view of left valve; i, dorsal view of left valve; k, dorsal view of right valve; l, plesiotype 
USNM 648736; penultimate instar showing well-developed terminal spine. 
