266 American Seashells 



Terebra concava Say Concave Auger 



Plate 26) 

 North Carolina to both sides of Florida. 



% inch in length, slender, about 1 2 whorls, semi-glossy, and with slightly 

 concave whorls. Whorls in spire with a large, heavily nodulated or beaded, 

 swollen spiral cord just below the suture. Above the suture there is a spiral 

 series of 20 very small beads per whorl. The concave middle of the whorl 

 bears about 5 microscopic, incised spiral lines. Color yellowish gray. Com- 

 mon in shallow water. Do not confuse with the larger yellow T. floridana 

 which has 2 spiral rows of elongate beads just below the suture. 



Terebra protexta Conrad Fine-ribbed Auger 



Plate 26k 



North Carolina to Florida and Texas. 



% to I inch in length, about 1 3 whorls, dull-white in color and with a 

 well-indented suture. Whorls in spire slightly concave with about 22 fine 

 axial ribs running from suture to suture, but which are broken weakly by 7 

 to 9 incised spiral lines. The upper line is about % the way down the whorl. 



Several forms exist which have been given names: form lutescens Smith 

 has about 30 to 32 finer axial riblets per whorl which are made slightly beaded 

 by the spiral lines; in the form limatula Dall, the ribs and the spiral threads 

 are about equal in size and give a reticulated pattern. All occur together in 

 fairly deep water and are common. 



Terebra hastata Gmelin Shiny Atlantic Auger 



Plate 26h 



Southeast Florida and the West Indies. 



1/4 to I ^ inches in length. Characterized by its smooth, highly glossy 

 finish, its numerous axial ribs which extend from suture to suture, and by its 

 bright yellowish color and white band below the suture. Columella smooth- 

 ish and white. This is the "fattest" species in the western Atlantic, and is 

 fairly common in the West Indies. 



Terebra cinerea Born Gray Atlantic Auger 



Plate 26g 



Southeast Florida and the West Indies, 



I to 2 inches in length, slender, with flat-sided whorls and a sharp apex. 

 Numerous small riblets extend halfway down the whorls (about 45 to 50 

 per whorl). Color all cream or bluish brown; sometimes with darker spots 

 below the suture. Surface with exceedingly fine, numerous rows of pin- 

 pricks which give the shell a silky appearance under the lens. Moderately 

 common in shallow water. Compare with salleana Deshayes. 



