TURRIDAE 267 



Terebra salleana Deshayes Salle's Auger 



North Florida to Texas and Colombia. 



I to 1% inches in length, similar to cinerea, but always a dark bluish 

 gray or brownish, with fewer, larger punctations, with about 30 ribs per 

 whorl, and with a purple, not white, nucleus. Common in shallow water. 



Terebra pedroana Dall San Pedro Auger 



Redondo Beach, California, to Lower California. 



I to i^ inches in length, strong, slender, with about 12 whorls and 

 colored grayish to whitish yellow or brownish. Sculpture between sutures 

 of first a fairly broad row of well to poorly developed nodules (about 15 to 

 18 per whorl), followed below by a flat area which is weakly and axially 

 wrinkled or ribbed and with numerous, fine, spiral, incised lines. Siphonal 

 canal bounded by a sharp spiral line on the outer shell. Fairly common in 

 shallow water. 



Fajnily TURRIDAE 



The family Turridae is a very large and diverse group of toxoglossate 

 gastropods which are very difficult to classify. A book of this size cannot do 

 justice to the many interesting species found in our waters. The family prob- 

 ably contains no less than 500 genera and subgenera and several thousand 

 species. An interesting and valuable review of the family is given by A. W. 

 Powell in the Bulletin of the Auckland htstitute and Museum, no. 2, pp. i to 

 188, 1942. Those interested should consult the works of Grant and Gale, 

 Bartsch, Dall, Rehder, and Woodring. We have included here only a very 

 sketchy representation of our American Turrid fauna. 



Subfamily TURRINAE 



Shells rather large, usually with a long, slender canal. Sinus on or adja- 

 cent to peripheral keel; deep and V-shaped. Operculum leaf-shaped with an 

 apical nucleus. Radula with only 2 marginals which are wish-bone in shape. 



Genus Gemmula Weinkauff 1875 

 Geiinnula periscelida Dall Atlantic Gem Turret 



Figure 57c 



North Carolina to Tortugas, Florida. 



1% to 2 inches in length, heavy and with the sinus or anal notch well 

 below the suture. Color ash-gray. See illustration. Rare in 100 fathoms. 



