182 TEREBRID A. 
ADMETOPSIS, Meek, 1872. Lower fold of columella most 
distinct, whilst the second fold is the most prominent in Admete ; 
inner lip thickened throughout. 3 sp. Cretaceous; Utah. A. 
gregaria, Meek (lvii, 6). 
[Genus Purpurtna, Lycett. This group of fossil shells, which 
I have placed in the Purpurine, is by others referred to Can- 
cellariidee. | 
Famity TEREBRID%. 
The Terebras are known by their long, narrow, many-whorled 
shells, with small aperture, notched in front, and no true colu- 
mellar plaits. The animal has a foot rounded in front, elongated 
behind; the head is large, with short, small tentacles; eyes at or 
near the tips of the tentacles, or wanting; between the tentacles 
extends a rather long cylindrical trunk. Operculum annular, 
horny, with apical nucleus. 
TEREBRA, Lam. 
Auger-shell. 
Syn.—Terebraria, Raf. Acus, Humphrey. Dorsanum, Gray. 
Pyramitra, Coelatura and Terebrifusus, Conr. 
Distr.—About 200 sp. Mostly tropical; East Indies, West 
Coast America, etc. Fossil, 25 sp. Commencing with Eocene. 
Shell elongated, turriculated, narrow, solid; whorls numerous, 
rather flattened, with superficially impressed sutures; aperture 
small, ovate, profoundly notched at the base; columella oblique. 
suBULA, Schum. Whorls smooth, aperture not produced. 
7. maculata, Linn. (lvii, 7). 
ABRETIA, H. and A. Adams. Whorls longitudinally ribbed, 
aperture a little produced in front. 7. cerithina, Lam. (lvil, 8). 
HASTULA, H. and A. Adams. Whorls usually smooth, colu- 
mella simple, a little produced in front. 7. strigillata, Linn. 
(ivii, 9). 
gEuRYTA, H. and A. Adams. Shell smooth or slightly ribbed, 
turriculated ; last whorl somewhat ventricose; aperture large ; 
columella produced in front,a little twisted. 7. aciculata, Lam. 
(Ivii, 10). 
TEREBRA, Adanson. Shell much elongated, subulate ; whorls 
very numerous, rather flat with a spiral band revolving beneath 
the sutures; aperture small, canaliculate. JZ. cingulifera, Lam. 
Evan 1 1): 
MYURELLA, Hinds. Shell much elongated, subulate; whorls 
numerous, ribbed with a band of tubereles below the sutures. 
T. nebulosa, Sowb. 
PUSIONELLA, Gray. 
Syn.—Netrum, Phil. 
Distr—W. Africa, ete. P. nifat, Adans, (Ivii, 12). 
