6 
PACIFIC SCIENCE, Vol. XXI, January 1967 
a terrace. The total sample consisted of two 
small rocks of calcareous algae. 
Station T-ll. A dredge haul from 21° 
22.8'N, 157° 34.7'W at 295 fathoms to 22° 
23.1'N, 157° 33.8'W at 320 fathoms across the 
top of a terrace. About 30 lb of reef rock, some 
fragments with Mn0 2 coatings, and some basalt 
pebbles were collected. 
Station T-12. A dredge haul from 21° 
17.8'N, 157° 28.8'W at 308 fathoms to 21° 
19.0'N, 157° 29.7'W at 322 fathoms across the 
top of a terrace. About 150 lb of reef rock 
similar to T-ll were collected. 
Station T-13. A dredge haul from 20° 
59.5'N, 157° 42.0'W at 22 fathoms to 20° 
59.5'N, 157° 4l.8'W at 22 fathoms, across the 
top of Penguin Bank. About 200 lb of living 
reef material were collected. 
Station S-23. A dredge haul collected in 
September 1962 by Francis P. Shepard aboard 
the Scripps Institution’s R. V. "Spencer F. 
Baird" at 22° 13.6'N, 159° 16 . 6 'W at 355 
fathoms, on a drowned terrace on the north 
side of Kauai. 
Station HA. A bottom sample collected in 
August 1962 by Edwin C. Allison at 157° 
4l.8'W, 21° 16.5'N at 10 m in Hanauma Bay, 
on the southeast corner of Oahu, consisting of 
about 1 lb of clean calcareous sand containing 
living ostracodes. 
Station AR. A dredge haul collected by Henry 
W. Menard aboard the Scripps Institute’s R. V. 
"Argo" at about 21° 14'N, 157° 57'W at 
about 260 fathoms from a drowned terrace off 
Honolulu, Hawaii. More than 200 lb of fossil 
reef debris were collected. 
Station CL. A bottom sample collected in 
August 1948 by Edwin C. Allison off the edge 
of a submerged terrace on the north side of 
Clipperton Island, opposite the west end of the 
main washout area, at 20-22 fathoms. Sample 
contained living ostracodes. 
Station EA-1. A dredge haul collected in Feb- 
ruary 1958 during the Scripps Institute of 
Oceanography’s Downwind Expedition at 27° 
04’S, 109° 18'W at 22-25 fathoms in La Pe- 
rouse Bay, Easter Island. The sample contained 
200 lb of basalt cobbles and calcareous debris 
and living coral. 
Station EA-2. A dredge haul collected in Feb- 
ruary 1958 during the Scripps Institute of 
Oceanography’s Downwind Expedition at 27° 
04'S, 109° 16'W at 72-80 fathoms. The sam- 
ple contained 50 lb of living corals and mol- 
lusks around fossiliferous limestone and marl. 
SYSTEMATIC DESCRIPTIONS 
Following each locality number in the species- 
distribution section is the absolute abundance 
of that species; the number of single valves 
observed is denoted by "valves,” entire speci- 
mens by "entire.” All measurements are in mil- 
limeters. 
Most of the types are reposited at the U. S. 
National Museum in Washington, D.C. and are 
designated with usnm numbers. Some secondary 
types are reposited at the San Diego Museum 
of Natural History in San Diego, California, 
and are designated with sdnh numbers (San 
Diego Natural History Society). 
Subclass ostracoda Latreille, 1802 
Order podocopida Muller, 1894 
Suborder platycopina Sars, 1866 
Family cytherellidae Sars, 1866 
Genus Cytherelloidea Alexander, 1929 
Cytherelloidea monodenticulata n. sp. 
Figs. 1 a-e 
diagnosis: Randomly pitted carapace; faint 
circular central depression in adult, and large 
centrodorsal toothlike structure in left valve. 
description: In lateral view: carapace 
slightly narrowing posteriorly; dorsal margin 
gently convex; ventral margin broadly, gently 
concave; anterior margin evenly rounded; pos- 
terior margin truncate (mature) to rounded 
(immature); greatest height at anterior; broad 
rim around all margins, except mid-dorsum, 
bounded by deep pits (mature) or large reticu- 
lations (immature) ; anteromarginal rim with 
narrow peripheral ridge, tending to be dentic- 
ulate in adults; surface of left valve sparsely 
pitted in low areas, more densely pitted near 
margins, surface of right valve in penultimate 
instar smoother than left valve; oblong sub- 
central depression prominent; dorsal and elon- 
gate posterodorsal depression poorly developed. 
In dorsal view: greatest width just behind cen- 
ter. 
Right valve larger and overlapping left 
valve; strong toothlike projection present in 
