Micronesian Gastropods — Demond 
315 
geographic range: USNM records are 
from Anna Island and Cocos-Keeling Atoll 
in the Indian Ocean eastward through the 
Pacific to the Society and Tuamotu islands, 
and from the Ryukyu, Hawaiian and Line 
islands south to New Guinea and New Cale- 
donia. Fairly common in Micronesia. The 
foregoing range includes N. francolinus , the 
Hawaiian form or subspecies which is en- 
tirely smooth and bears well-defined tentlike 
markings. 
Family MAGILIDAE— Coral Snails 
Genus Coralliophila H. and A. Adams, 
1853 
Coralliophila hulhiformis (Conrad, 1837). 
Tinker (1952) p. 104, 2 figs, on p. 105. 
Characteristically 0.75 to 1.25 inches long. 
Shell white or yellowish, and purple within 
the aperture. Some authors regard C. bulbi- 
formis as a subspecies of C. violacea. However, 
it is here considered a distinct species, because 
its shell is covered with scaly spiral ridges, 
whereas the shell of C. violacea is relatively 
smooth. 
A single specimen was found living on a 
small lagoon reef in about 10 feet of water 
on the sandy lagoon shelf at Ifaluk. 
geographic range: Apparently limited to 
the Pacific. USNM records are from southern 
Japan, the Ryukyu, Philippine, Caroline, Ha- 
waiian and Tuamotu islands and from Samoa, 
New Guinea, and northern Australia. Un- 
common in Micronesia. 
Coralliophila erosa (Roding, 1798) (syn. exa- 
rata Pease, 1861; galea Reeve, 1846). 
Tinker (1952) p. 104, 3 figs, on p. 105 [as 
C. deformis Lamarck], 
Characteristically 1.25 to 1.75 inches long. 
Shell white both exteriorly and within the 
aperture and sculptured with fine, scaly spiral 
ridges and obscure axial ribs which are par- 
ticularly prominent on the spire. 
The recent Micronesian collections contain 
only one specimen, taken from coral at a 
depth of about six feet in the lagoon at Ifaluk. 
GEOGRAPHIC range: USNM records are 
from Mauritius and Cocos-Keeling Atoll in 
the Indian Ocean eastward through the Pa- 
cific to Hawaii and Samoa, and from southern 
Japan south to the East Indies, New Guinea, 
and Fiji. Not reported from Australia. Un- 
common in Micronesia. 
Coralliophila violacea (Kiener, 1836) (syn. neri- 
toidea Gmelin, 1791; squamulosa Reeve, 
1846). 
Hirase and Taki (1951) pi. Ill, fig. 8; 
Tinker (1952) p. 104, 3 figs, on p. 105 
[as C. neretoidea Lamarck]. 
Characteristically 1 to 1.5 inches long and 
whitish with a bright violet aperture. 
C. violacea is a solitary species which lives 
in pocketlike depressions on coral. It in- 
variably occurs on living corals and may be 
dependent upon them for nourishment. Speci- 
mens in the recent Micronesian collections 
were found on species of Porites on small 
lagoon reefs and on small reef patches in 
lagoons. C. violacea lives below low tide line, 
typically at depths of a few feet. 
The eggs of this species are held in capsules 
under the shell of the female until the pelagic 
larvae hatch. After a free-swimming period, 
the larvae settle upon coral, and, as noted 
above, this habitat is maintained by the adult 
form. 
geographic range: The commonest 
Coralliophila in the Indo-Pacific. USNM rec- 
ords are from Mauritius in the Indian Ocean 
eastward through the Pacific to the Hawaiian 
and Tuamotu islands, and from southern 
Japan south to northern Australia and the 
Loyalty Islands. 
Genus Quoyula Iredale, 1912 
The collections studied include two species 
of Quoyula; Q. monodonta with very fine, spiral 
ridges, and Q. madreporarum with coarser, 
scaly spiral ridges. Q. madreporarum tends to 
be more elongate than Q. monodonta . How- 
ever, both species vary in shape, because they 
