96 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
rounded. Base short, well-rounded. Entire surface of the spire and base 
marked by numerous exceedingly fine wavy spiral striations. Aperture 
subquadrate, posterior angle obtuse; outer lip thin; columella short, mod¬ 
erately strong, slightly twisted and reflected, provided with a weak oblique 
fold at its insertion. Length, 6.3; diameter, 1.5 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 163241. Type locality, 
San Pedro, California. 
Range. Santa Rosa Island, California, to Point Abreojos, Lower 
California. 
Turbonilla canadensis Bartsch, 1917 
Plate 51, fig. 11 
Proceedings of the United States National Museum, 52:641; PI. 44, fig. 11. 
Shell elongate-conic, slender, yellowish-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- 
fourth immersed. Post-nuclear whorls almost flattened, rather high be¬ 
tween the sutures, appressed at the summit, marked by quite regular, 
slightly curved, protractive, axial ribs, of which fourteen occur upon 
the first, sixteen upon the second and third, eighteen upon the fourth and 
the seventh, twenty upon the eighth, and twenty-two upon the ninth and 
the penultimate turn. Intercostal spaces not quite as wide as the ribs, 
deeply impressed, terminating at the periphery, which is decidedly angu- 
lated. There is a smooth space between the periphery and the succeed¬ 
ing whorl, which falls at some little distance anterior to the periphery 
of the preceding turn. This gives the whorls a somewhat overhanging 
appearance. Sutures well-constricted. Base short, well-rounded, entire 
surface marked by miscroscopic striations. Aperture subquadrate, pos¬ 
terior angle obtuse; outer lip thin; inner lip slightly curved and somewhat 
revolute. Length, 6.3; diameter, 1.5 mm. (Bartsch.) 
Type in United States National Museum, No. 273964. Type locality, 
Forrester Island, Alaska. 
Range. Known only from type locality. 
Turbonilla vancouverensis Baird, 1863 
Proceedings, Zoological Society of London, 67. Bulletin 68, United States National 
Museum, 44; PI. 4, fig. 9. 
Ch. testa elongata-turrita, cylindrica, longitudinaliter oblique forte cos- 
tata; anfractibus novem, ultimo superne indistincte costato, infra laevigato; 
apertura parva, rotundato-ovata; suturis impressis. Length, % in. 
[3941 
