BUCCINID. 143 
into a long recurved canal; inner lip simple: outer lip poste- 
riorly sinuated, striate within. Operculum ovate, nucleus apical. 
Metuta, H. and A. Adams. 
Distr.—4 sp. N. Zealand, Japan. WM. clathrata, Ads. and 
Rve. (1, 24). 
Shell elongately fusiform, finely cancellated; spire elevated, 
acute; aperture narrow; inner lip distinct, smooth; outer lip 
thickened externally, crenulated within, emarginate posteriorly. 
Operculum unknown. 
CanTuHarvs, Bolten. 
Syn.—Pollia, Gray. Tritonidea, Swn. 
Distr.—55 sp. All tropical and subtropical seas. C. Tran- 
quebaricus, Gmel. (1,25). C. distortus, Gray (1, 26). 
Shell bucciniform, more or less ventricose in the middle, 
narrowed anteriorly ; spire and aperture nearly equal; columella 
generally with a few transverse ridges; outer lip internally 
crenated, and with a superior siphonal canal. Operculum ovate, 
nucleus apical. 
Swainson described a group Tritonidea, which Messrs. H. and 
A. Adams make a subgenus under Cantharus, distinguishing it 
from the typical form by “ Shell turreted; canal lengthened.” 
The distinction is altogether arbitrary, as the spire in the different 
species varies considerably from the typical species of Cantharus 
to much higher, but with no considerable break in the series, 
whilst the canal can scarcely be called “lengthened” in any of 
them. 
CANTHARULUS, Meek. Shell with canal moderately produced, 
rather narrow and twisted; inner lip smooth throughout, and 
rather well developed ; columella arcuate and twisted, so as to 
form an obtuse, undefined prominence below; outer lip slightly 
sinuous above. C. Vaughani, Meek and Hayden (li, 63). Cre- 
taceous ; Upper Missouri River. 
MetTuLe tna, Gabb. 
Distr.—M. fusiformis, Gabb (li, 64). Miocene; San Do- 
mingo, W. I. 
Shell fusiform, canal more or less produced ; inner lip covered 
with a thickened plate, continuous posteriorly with the outer 
lip. Interior of both inner and outer lips strongly denticulated 
or transversely striated. Surface cancellate or costate. More 
distinctly fusiform than Metula, the columella with a row of 
denticles. 
AaGaAsoma, Gabb. 
Distr.—A. sinuata, Gabb (li, 65). Miocene ; California. 
Subfusiform, spire low, body-whorl long; canal moderately 
