Micronesian Gastropods — Demond 
319 
Loyalty Islands. Reported from southern Ja- 
pan and the Great Barrier Reef, Australia, 
but not from Hawaii. Fairly common in 
Micronesia. 
Genus Engina Gray, 1839 
Engina mendicaria (Linne, 1758). 
Hirase and Taki (1951) pi. 105, fig. 8. 
Characteristically one-half inch long and 
blackish brown with spiral yellowish-white 
bands and a brown aperture. 
Ordinarily lives under rocks near or just 
below low tide line on seaward reef flats, both 
windward and leeward. Also found in rocky 
tide pools across the entire reef flat. 
geographic range: USNM records for 
this common Indo-Pacific species are from 
the Red Sea and Mauritius eastward through 
the Indian and Pacific oceans to Samoa, and 
from southern Japan and Hawaii south to the 
Loyalty and Tonga islands. 
Genus Colubraria Schumacher, 1817 
Coluhraria strepta Cossmann, 1903. 
Hirase and Taki (1951) pi. 105, fig. 2; 
Tinker (1952) p. 80, 2 figs, on p. 81. 
Characteristically 1.5 to 2 inches long. 
The only specimen in the recent Microne- 
sian collections was taken off Ine Village, 
Arno Atoll, on rocks on a small lagoon reef 
in about 6 feet of water. 
geographic range: Apparently limited to 
the Pacific and uncommon in Micronesia. 
USNM records are from New Guinea, the 
Marshall, Line, Hawaiian, and Tuamotu is- 
lands, and from Fiji and Samoa. 
Genus Caducifer Dali, 1904 
Caducifer decapitatus (Reeve, 1844). 
Characteristically about three-fourths inch 
long. Columnar in shape and white with thin 
brown axial ribs interrupted by a few white 
spiral lines. Invariably found with its apex 
broken. 
Fig. 29. Caducifer decapitatus (Reeve). Oshima Osu- 
mi, Japan (USNM 273493). 
At Onotoa and Saipan C. decapitatus was 
collected from crannies in both living and 
dead coral on small lagoon reefs and in shal- 
low passes between seaward reefs. At Arno 
Atoll, it was found on branching coral ( Pocil - 
lopora sp.) off the seaward reef edge. It or- 
dinarily lives below low tide line, commonly 
at depths of 4 to 10 feet. 
geographic range: USNM records are 
from Mauritius, southern Japan, and the Ma- 
riana, Gilbert, Fiji, Samoan and Hawaiian 
islands. Uncommon in Micronesia. 
Family NASSARIIDAE— Mud Snails 
Genus Nassarius Dumeril, 1806 
Nassarius crenelli ferns (A. Adams, 1851). 
Characteristically 0.75 to slightly less than 
1 inch long and grayish with two indistinct 
dark brown spiral color bands on the body 
whorl. Outer lip and parietal callus polished 
white. 
The recent Micronesian collections contain 
only one specimen which was found living 
Fig. 30. Nassarius crenelliferus (A. Adams). Yap 
Island, western Carolines (USNM 614204). 
