132 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
closed between them being about equal to the space inclosed between the 
spiral lines on the spire. Aperture subquadrate, posterior angle acute, 
outer lip thin, showing the external sculpture within; columella slender, 
oblique, somewhat twisted and slightly revolute. (Dali and Bartsch.) 
Type in United States National Museum. Type locality, Long Beach, 
California. 
Range. Redondo Beach to San Diego, California. 
Turbonilla aragoni Dali and Bartsch, 1909 
Plate 53, figs. 12, 12a 
Bulletin 68, United States National Museum, 85; PI. 9, figs. 12, 12a. 
Shell elongate-conic, anterior half of whorls chestnut-brown, the rest 
flesh-colored. Nuclear whorls two, forming a depressed helicoid spire, 
whose axis is at right angles to that of the succeeding turns, in the first 
of which it is one-fifth immersed. Post-nuclear whorls well-rounded, 
slightly contracted at the suture, appressed at the summit, marked by 
acute vertical axial ribs, of which sixteen ocur upon the first to seventh, 
twenty upon the eighth, and twenty-six upon the penultimate turn. Inter¬ 
costal spaces about two and one-half times as wide as the ribs, marked 
by fine lines of growth and seven, strongly incised, spiral grooves, and 
numerous, exceedingly fine, spiral striations. Sutures slightly contracted. 
Periphery of the last whorl slightly angulated, marked by a narrow plain 
band. Base short, well-rounded, marked by fifteen well-incised and 
numerous very fine spiral lines. Aperture rhomboidal, posterior angle 
obtuse; outer lip thin, showing the external markings within; columella 
slender, slightly curved. Length, 7.2; diameter, 2 mm. (Dali and 
Bartsch. ) 
Type in United States National Museum, No. 206867. Type locality, 
off New Monterey, Monterey Bay, California, in 29 fathoms. 
Range. Known only from type locality. 
Turbonilla recta Dali and Bartsch, 1909 
Plate 55, figs. 12, 12a 
Bulletin 68, United States National Museum, 85; PI. 7, figs. 12, 12a. 
Shell broadly conic, milk-white. Nuclear whorls small, two and one- 
half, depressed, helicoid, having their axis at right angles to that of the 
succeeding turns, in the first of which they are about one-third im¬ 
mersed. Post-nuclear whorls slightly rounded, somewhat exserted, 
weakly shouldered at the summit, marked by slender, protractive, axial 
ribs, of which twenty-two occur upon the second, twenty-four upon the 
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