294 
PACIFIC SCIENCE, Vol. XI, July, 1957 
Fig. 11 . Hipponix ( Sabia ) conicus (Schumacher), a, 
exterior view of specimen from Pavuvu, Solomon Is- 
lands (USNM 488419); b, interior view of specimen 
from Ifaluk Atoll, Caroline Islands (USNM 614198). 
migera, Drupa morum and D. rubusidaeus , Mo- 
rula elata , Cerithium tuberculatum and C. 
nodulosum , and on Conus distans , C. flavidus, C. 
lividus, and C. aulicus. A species with similar 
attachment habits (H. australis) has been ob- 
served by Risbec (Yonge, 1953) to feed upon 
the faecal pellets of the host shell. Microne- 
sian specimens of Hipponix found attached to 
corals, algae, or rocks (Morrison, Cloud) 
probably feed on detritus, as does the com- 
mon Californian H. antiquatus (Yonge, 1953), 
and may represent an unrecorded species. 
GEOGRAPHIC range: USNM records are 
from East Africa throughout the Indian and 
Pacific oceans to the Hawaiian, Tuamotu, 
and Society islands, and from southern Japan 
south to northern Australia and New Cale- 
donia. Common in Micronesia. 
Genus Cheilea Modeer, 1793 
Cheilea equestris (Linne, 1758). 
Tinker (1952) p. 182, fig. on p. 183 (as 
C. dillwyni (Gray) ); Kira (1955) pi. 13, 
fig. 9 (as C. scutulum (Reeve) ). 
Characteristically 1.25 to 1.5 inches long, 
yellowish white externally and polished white 
Fig. 12. Cheilea equestris (Linne). Onotoa Atoll, Gil- 
bert Islands (USNM 607768). 
within. Lives among rocks on both seaward 
and lagoon reef flats, ordinarily a few feet 
below low tide line. 
GEOGRAPHIC RANGE: USNM collections 
are from the Caroline, Marshall and Gilbert 
islands and indicate the species to be fairly 
common in Micronesia. It is reported from 
southern Japan and Hawaii. 
Family STROMBIDAE- Conch Shells 
Genus Strombus Linne, 1758 
Strombus dentatus Linne, 1758 (syn. tridentatus 
Gmelin, 1791). 
Tinker (1952) p. 164, 3 figs, on p. 165 
[as S. tridentatus Lamarck]; Kira (1955) 
pi. 15, fig. 3 [as Canarium tridentatum 
(Gmelin) ]. 
Characteristically 1.5 to 2 inches long. Shell 
whitish, mottled with yellow or brown, and 
with transverse raised ridges on all whorls. 
Interior of aperture dark orange-brown. Outer 
lip ridged internally, flared, and bearing sev- 
eral, large white teeth on its outer edge. 
Only one specimen in the recent Microne- 
sian collections was taken alive, from under 
rocks in 3 to 4 feet of water on the sandy 
lagoon shelf at Ifaluk. Several beach- worn 
specimens were collected at Eniwetok and 
Bikini, among rocks on both seaward and 
lagoon reef flats. 
geographic range: USNM collections 
are from East Africa, the Red Sea, and Mauri- 
tius eastward through the Pacific to the Tua- 
motu Islands, and from southern Japan and 
