CLASS GASTROPODA 
133 
third, twenty-eight upon the fourth and fifth, and thirty upon the penul¬ 
timate whorl. Intercostal spaces about as wide as the ribs, marked by 
eight, equal and equally spaced, spiral series of pits. Sutures strongly 
marked, crenulated by the ribs. Periphery of the last whorl well-rounded, 
appearing as a broad plain band, marked only by the feeble continuations 
of the axial ribs. Base short, well-rounded, marked by ten, equal and 
almost equally spaced, spiral striations. Aperture oval; posterior angle 
acute; outer lip thin, showing the external sculpture within; columella 
slender, strongly curved, slightly revolute, with a weak fold at its inser¬ 
tion. Length, 3.6; diameter, 1.3 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 162635. Type locality, 
Point Abreojos, Lower California. 
Range.- San Diego, California, to Point Abreojos, Lower California. 
Turbonilla weldi Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 86; PI. 8, fig. 11. 
Shell large, chestnut-brown with a broad peripheral light band, and 
a light area about the columella. (Nuclear whorls decollated.) Post- 
nuclear whorls well-rounded, somewhat overhanging, strongly contracted 
at the suture, appressed at the summit, marked by moderately strong, 
rounded, slightly retractive axial ribs, of which twenty-four occur upon 
the third to fifth, twenty-eight upon the sixth, and about thirty-five upon 
the penultimate turn, upon which they are less regular than on the others. 
Intercostal spaces a little wider than the ribs, marked by eight, broad, 
deep, spiral series of pits which are subequal, excepting the three above 
the peripheral one, the median on which is much narrower than the rest. 
Sutures strongly constricted. Periphery and base of the last whorl in¬ 
flated, well-rounded, marked by the feeble continuations of the axial 
ribs, a broad line of pits immediately below the periphery, and seven, 
equal and equally spaced, broad, well-incised, spiral lines. Aperture 
large, broadly oval, posterior angle acute; outer lip very strong curved, 
thin, showing the external markings within; columella slender, twisted, 
curved, and slightly revolute. Length, 8.8; diameter, 2.7 mm. (Dali 
and Bartsch.) 
Type in United States National Museum, No. 206868. Type locality, 
University of California Station 14, off Point Fermin, California. 
Range. Known only from type locality. 
Turbonilla nereia Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 86; PI. 8, figs. 1, la. 
Shell broadly conic, pale yellow, with a broad dark wax-yellow band, 
which extends over a little more than one-half the distance from the 
[4311 
