Page:American Seashells (1954).djvu/349

Rh 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.