CLASS GASTROPODA 
273 
sculpture. In addition to this, the entire surface of the spire is marked 
by axial lines of growth and closely spaced spiral striations. Suture 
strongly impressed. Periphery of the last whorl rendered angulated by a 
keel. Base short, slightly concave at the insertion of the columella, marked 
by fine lines of growth and very fine spiral striations, and a slender spiral 
thread at the insertion of the columella. Aperture subquadrate; decidedly 
channeled anteriorly; posterior angle obtuse; outer lip rendered sinuous 
by the spiral cords; inner lip sigmoid, reflected over and appressed to 
the columella. Length, 5.5; diameter, 2.7 mm. (Bartsch.) 
Type in United States National Museum, No. 340826. Type locality, 
off O’Neal Island, Puget Sound. 
Range. Puget Sound. 
Cerithiopsis columna Carpenter, 1864 
Plate 68, fig. 6 
Supplementary Report, British Association for the Advancement of Science, 660. Pro¬ 
ceedings of the United States National Museum, 40: PI. 36, fig. 6. 
C. testa majore, valde elongata, purpureo-fusca; anfr. norm, ix, 
planatis, suturis distinctis; seriebus iii nodulorum spiralibus valde appres- 
sorum, creberrimorum, interstitiis parvis, altis; aliis interdum intercalanti- 
bus; lira quarta supre suturam haud valde nodulosa, liris duabus baud 
expressis aream suturalem circumeuntibus; basi planata, haud sculpta, ad 
peripheriam obtuse angulata; apertura quadrata. Long., .38; long, spir., 
.32; lat., 1 poll. (Carpenter.) 
Shell elongate-conic, light chestnut brown. (Early whorls decollated.) 
Succeeding turns very slightly rounded, marked by three tuberculate spiral 
keels, of which one is at the summit, another a little above the periphery ^ 
and a third a little nearer the posterior than its suprasutural neighbor. 
These keels are separated by spiral grooves, which are only about one-third 
as wide as the keels. In addition to the spiral keels, the whorls are marked 
by almost vertical axial ribs, which are about two-thirds as strong as the 
spiral cords and very closely spaced. Of these, 16 occur upon the second 
and third, 18 upon the fourth, 22 upon the fifth and sixth, 24 upon the 
seventh, 26 upon the eighth, and 32 upon the penultimate turn. The 
narrow spaces inclosed between the ribs and spiral cords appear as small, 
well-impressed, rounded pits. Suture moderately constricted, showing the 
posterior edge of the first basal keel in the early whorls. Periphery of the 
last whorl marked by a sulcus as wide as those that separate the keels on 
the spire, and the continuation of the axial ribs. Base short, well-rounded, 
marked with three slender spiral keels which are situated on the posterior 
two-thirds and separated by shallow channels. The first of these is crossed 
[ 571 ] 
