ADDENDA ET CORRIGENDA. #507 
Inhabits Tutuila, Samoa Islands. 
This might be regarded as the young of 7. nodosum ; but besides 
bearing all the marks of maturity, it is more slender, the longitudinal 
lines are stronger, and the lip is white. 
Figure 297, the shell, enlarged; 297 a, the animal, with the shell, 
as in progression; 297 6, plantar view of the same. 
PHOS VARICOSUS. 
Testa elongata, lanceolata, fulvida, rubiginoso-cincta, costis lamellosis ad 
sexdecem clathrata, quorum ad tribus in singulis anfractibus, varicifor- 
mibus, pallidioribus, tinterspatiis duplo latioribus, concavis et lineis 
incrementi striatis, omnibus filis volventibus retrorsum acclinatis decus- 
satis: spira turrita, anfractibus novem vel decem superne turgidis : 
apertura angusta, lunata, posticé rotundata trientem longitudinis teste 
adequans ; labro simplict, intus sulcato, rosaceo ; columella quadri- 
plicata ; canali siphonali brevi. 
Phos varicosus ; Proc. Bost. Soc. Nat. Hist., ii. 145. May 1849. 
Expedition Shells, 66. 
SHELL elongated, lanceolate, pale fawn-colour girdled with ferrugi- 
nous, barred with about sixteen compressed ribs, about three of which 
on each whorl are thickened into pale varices; the spaces between 
these are about twice the width of the varices, with elevated lines of 
growth, decussated by revolving lines, which incline backwards; spire 
turreted, whorls nine or ten, turgid posteriorly; aperture narrow, 
lunate, rounded posteriorly, about one-third as long as the shell; lip 
simple, suleated within, rose-coloured ; columella four-plaited ; siphonal 
canal short. 
Length an inch and an eighth; breadth nine-twentieths of an inch. 
Inhabits the Philippine Islands. 
This curious shell is somewhat anomalous, having the varicose spire 
of a Triton, but the unequivocal aperture of Phos. It may be com- 
