Terebridae and Conidae 177 



generally in sandy stations. 



The shells are elongate and tapering, with whorls regularly in- 

 creasing in size. A short aperture terminating in a recurved basal 

 notch. 



Genus TEREBRA Bruguiere, 1789 



Subgenus STRIOTEREBRUM Sacco, 1891 



Terebra disloe<ata324 Say PI. 37, fig. 251 



Alt., to 40 mm. Shell elongate, tapering regularly to acute 

 apex; color an indefinite blend of ashy blue and brownish tones, apex 

 dark; about 15 flattened whorls, sutures distinct; sculpture of close 

 longitudinal plicature cancellated by spiral grooves; nodulous band 

 below sutures; aperture small, outer lip thin; columella short, re- 

 curved into basal notch; operculum corneous, translucent, yellow- 

 ish, apical nucleus. 



Abundant on sand bars exposed at extreme low tide. 



Terebra concava vinosa^-^ Dall PI. 37, fig. 252 



Alt., to 22 mm. Shell with general characters of T. dislocata; 

 smaller, upper whorls thin, color bluish gray with vinous tint, 

 sometimes maculations of reddish brown, apex dark; about 13 

 whorls; sculpture of delicate longitudmal plications and spiral 

 grooves; small subsutural band; operculum brown. 

 Most common in inside bays. 



Terebra protexta^^e (Conrad) PI. 37, fig. 253 



Alt., to 30 mm. Shell with general character of other Terebras; 

 13 to 15 whorls; lower portion of whorls brown, sutural band light; 

 longitudinal plications convex over whorls, spiral sculpture obsolete 

 or wanting over sutural band; operculum red-brown or claret color. 

 Dredged in three to six fathoms. 



Family CONIDAE 

 The families Terebridae, Conidae and Cancellariidae compose a 

 group of animals which share a quality unique in the phylum Mol- 

 lusca — the possession of poison glands. The venomous secretion 



3-*Lat., terebra, a boring tool, e.g. auger; dislocatus, dislocated. 

 3-5 Lat., concavus, hollow; vinum, wine. 

 326 Lat., pro, before; textus, texture. 



