178 COLUMBELLID.©. 
within its shell, it is said, when irritated, to spontaneously detach 
a portion of this foot. 
sin1A, Mayer, 1876. Ribs deflected, spire short, suture not deep. 
H. Zitteli, Mayer. Eocene. 
HARPOPSIS, Mayer, 1876. (Buccinopsis, Bayle.) Shell smooth, 
the last whorl slightly angulated below the suture, very large and 
long; mouth small, lengthened ; inner lip with thin callus; outer 
lip with slight posterior sinus. H. stromboides, Lam. Eocene ; 
Paris basin. 
Famity COLUMBELLID%. 
Shell oval, covered by an epidermis; spire more or less 
developed, generally short; aperture narrow, elongated, termi- 
nating in a very short anterior canal; columellar lip usually den- 
tate; outer lip mostly thick, incurved in the middle and internally 
crenulated. Animal witha large, flattened head ; the foot narrow, 
oval, elongated ; the siphon scarcely longer than the canal of the 
shell. Operculum very small, lamellar, corneous. Dentition 
(x, 20). 
CoLuMBELLA, Lam., 1799. 
EHtym.—Diminutive of columba, a dove. 
Syn.—Columbus, Montf., 1810. Peristera, Rafinesque, 1815. 
Pygmea (Humphrey), Morch, 1858. 
Distr.—300 sp. Mostly subtropical; Atlantic Coast, U. S., 
West Indies, Mediterranean, India, China, Japan, Philippines, 
Australia, Polynesia, W. Coast of America. Fossil. Tertiary. 
CU. mercatoria, Lam. (lvi, 78). 
Shell strombiform or obovate, smooth or longitudinally or 
transversely ribbed; internal lip excavated in the middle, crenu- 
lated or denticulated in front; outer lip inflected and internally 
thickened and crenulated in the middle. 
NITIDELLA, Swainson, 1840. Shell oval, smooth, spire elevated ; 
aperture somewhat effuse below ; columella with two small ante- 
rior plications, outer lip somewhat thickened. C. nitida, Lam. 
(las 79. 
ALIA, H. and A. Adams, 1853. Shell thin, smooth, spire mod- 
erate ; aperture oval; inner lip finely crenulated, outer lip thick, 
not callous in the middle, striate within. C. unifasciata, Sowb. — 
(Ivi, 80). 
MITRELLA, Risso, 1826. Shell mitriform, smooth, spire elevated ; 
columella smooth or with a few anterior rugosities; outer lip 
smooth, or crenulated within. (C. lactea, Duclos (lvi, 81). 
ATILIA, H.and A. Adams, 1853. Shell fusiform, longitudinally 
plicate ; spire elevated, sharp; last whorl suddenly narrowed in 
front. C.suffusa, Sowb. (lvi, 82). 
ANACHIS, H. and A. Adams, 1853. Shell oval-fusiform, longi- 
tudinally ribbed; spire elevated; aperture narrow ; columella 
