CLASS GASTROPODA 
125 
Turbonilla nuttingi Dali and Bartsch, 1909 
Plate 55, figs. 13, 13a 
Bulletin 68, United States National Museum, 79; PI. 7, figs. 13, 13a. 
Shell long and slender, wax-yellow on the posterior half between 
the sutures, light brown on the anterior and the periphery. Nuclear 
whorls large, two and one-half, forming a depressed helicoid spire, the 
axis of which is at right angles to that of the succeeding turns, in the first 
of which it is about one-fifth immersed. Post-nuclear whorls moderately 
well-rounded, slightly shouldered at the summit, marked by strong, broad, 
well-rounded, somewhat protractive, axial ribs, of which twenty occur upon 
the first to sixth, twenty-two upon the seventh to ninth, and twenty-four 
upon the penultimate turn. These ribs extend prominently from the summit 
to the periphery of the whorls, but do not cross the latter. Intercostal 
spaces very narrow, not more than half the width of the ribs; anterior 
half between the sutures marked by five, equal and equally spaced, spiral 
grooves; posterior hal f marked by two, which equal those on the anterior 
half in strength but are a little more distantly spaced, and six fine incised 
lines, which divide the space posterior to the last groove. Sutures some¬ 
what constricted. Periphery of the last whorl well-rounded. Base short, 
well-rounded, marked by nine, slender, incised, spiral lines, which are 
successively a little closer spaced from the periphery to the umbilical 
region. Aperture rhomboid; posterior angle obtuse; outer lip thin, show¬ 
ing the external markings within; columella slender, somewhat curved, 
and slightly revolute. Length, 12.3; diameter, 1.6 mm. (Dali and 
Bartsch.) 
Type in United States National Museum, No. 160067. Type locality, 
off San Diego, California. 
Range. Off San Pedro and San Diego, California, in 15 to 20 fathoms. 
Turbonilla callia Dali and Bartsch, 1909 
Plate 55, fig. 4 
Bulletin 68, United States National Museum, 80; PI. 7, fig. 4. 
Shell elongate-conic, yellowish-white. Nuclear whorls decollated. 
Post-nuclear whorls moderately well-rounded, ornamented by rather weak, 
slightly protractive, axial ribs, of which sixteen occur upon the first 
four of the remaining turns and eighteen upon the rest. Intercostal 
spaces shallow, double the width of the ribs, marked by two lines of pits, 
one of which is at the periphery, the other a little posterior to the middle 
of the whorls and a series of finer incised lines of which seven irregularly 
spaced ones occur between the two rows of pits and four between the 
[423 ] 
