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PACIFIC SCIENCE, Vol. XI, July, 1957 
Characteristically 0.5 to 0.75 inch long. 
Grayish or whitish with strong axial ribs 
shouldered below the suture and crossed by 
many fine spiral grooves. The axial ribs are 
commonly whitish at the shoulders and oc- 
casionally brown in the middle of the whorl. 
Aperture white with four columellar plications . 
Lives in sandy lagoons from low tide line 
to depths of 150 feet. 
geographic range: According to USNM 
collections and published reports, distributed 
from South Africa and the Red Sea eastward 
through the Indian and Pacific oceans to the 
Marquesas Islands, and from the Ryukyu and 
Hawaiian islands south to the East Indies, 
New Caledonia, and the Loyalty Islands. Not 
reported from Australia. Uncommon in Mi- 
cronesia. 
Genus PusiA Swainson, 1840 
Pusia nodosa (Swainson, 1840). 
Tinker (1952) p. 62, 2 figs, on p. 63. 
Characteristically about one-half inch long 
and white with a yellow aperture. 
Lives among rocks and in tide pools across 
seaward reef flats, ranging from just shore- 
ward of the reef edge to the upper intertidal 
zone. Specimens in the recent Micronesian 
collections were taken from both windward 
and leeward ocean reefs but not from lagoon 
reefs. 
geographic range: USNM collections are 
from Mauritius eastward through the Pacific 
to the Society and Tuamotu islands, and from 
southern Japan and Hawaii south to the 
Caroline Islands and New Caledonia. Not 
reported from East Africa or Australia. Fairly 
common in Micronesia. 
Genus Scabricola Swainson, 1840 
Subgenus Chrysame H. and A. Adams, 1853 
Scabricola ( Chrysame ) cucumerina (Lamarck, 
1811) (syn. ferrugata Wood, 1825). 
Tinker (1952) p. 62, 3 figs, on p. 63. 
Characteristically 0.5 to 1 inch long and 
orange-red with white blotches. 
Ordinarily lives among rocks and in tide 
pools of windward ocean reef flats, at or near 
low tide line. Not reported from lagoon reefs. 
geographic range: USNM collections of 
this common Micronesian species are from 
Mauritius eastward through the Pacific to the 
Hawaiian and Tuamotu islands, and from the 
Ryukyu Islands south to New Guinea and 
New Caledonia. Reported from northern 
Australia. 
Scabricola ( Chrysame ) pertusa (Linne, 1758). 
Fig. 36. Scabricola (Chrysame) pertusa (Linne). Ifaluk 
Atoll, Caroline Islands (USNM 614203). 
Characteristically about 1.5 to 2 inches long 
and brownish or yellowish with conspicuous 
incised spiral lines and nodulose sutures. 
There is a single specimen from Ifaluk in 
the recent Micronesian collections. It was 
found living in a sand pocket on the wind- 
ward ocean reef flat, below low tide line in 
water about one foot deep. 
geographic range: USNM records of this 
uncommon Micronesian species are from the 
East Indies, Philippines, Marquesas, Samoa, 
Mariana, and Caroline islands. Not reported 
from Hawaii. 
