182 TEREBRIDiE. 



ADMETOPsrs, Meek, 1812. 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 (Ivii, 6). 



[Genus Purpurina, Lycett. This group of fossil shells, which 

 I have placed in the Purpurinse, is by others referred to Oan- 

 cellariidffi.] 



Family 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, 

 hornj', 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. 

 T. maculata, Linn. (Ivii, 7). 



abretia, H. and A. Adams. Whorls longitudinally ribbed, 

 aperture a little produced in front. T. cerithina, Lam. (Ivii, 8). 



HASTULA, H. and A. Adams. Whorls usually smooth, colu- 

 mella simple, a little produced in front. T. strigillata, Linn. 

 (Ivii, 9). 



EURYTA, H. and A. Adams. Shell smooth or slightly ribbed, 

 turriculated ; last whorl somewhat ventricose ; aperture large ; 

 columella produced in front, a little twisted. T. aciculata, lja,in. 

 (Ivii, 10). 



TEREBRA, Adanson. Shell much elongated, subulate ; whorls 

 very numerous, rather flat with a spiral band revolving beneath 

 the sutures ; aperture small, canaliculate. T. cinguUfera, Lam. 

 (Ivii, 11). 



MYURELLA, Hinds. Shell much elongated, subulate ; whorls 

 numerous, ribbed with a band of tubercles below the sutures. 

 T. nebulosa, Sowb. 



PusiONELLA, Gray. 



Syn.-^lsetvnm, Phil. 



Distr. — W, Africa, etc. P. nifat^ Adans, (Ivii, 12). 



