CLASS GASTROPODA 
91 
Type in United States National Museum, No. 56347. Type locality, 
Monterey, California. 
Range. Known only from type locality. 
Alvania carpenteri Weinkauff, 1885 
Plate 80, fig. 8 
Conchylien Cabinet , ed. 2, 192. Proceedings of the United States National Museum, 
41:341; PI. 29, fig. 8. 
A. testa parva, subturrita, rufo-fusca, marginibus spirae rectis; anfr. 
nucleosis 2 et dimidio, naticoideis, laevibus, tumentibus, apice mamillato; 
norm. 3 tumidis, suturis impressis; liris angustis distantibus, spiralibus 
circ. 12 (quarum 4-6 in spira monstrantus) et lirulis radiantibus, supra 
transeuntibus, baud nodulosis, secundum interstitia incurvatis, eleganter 
exculpta; interstitiis altis quadratis, peritremate continuo, subrotundato, 
acutiore. Long., 0.85; diam., 0.04; long, spirae, 0.05'/ (Carpenter.) 
Shell small, elongate ovate, yellowish-white. Nuclear whorls one and 
one-half, smooth, well-rounded. Post-nuclear whorls well-rounded; the first 
two slightly, slopingly shouldered at the summit, marked by slender, axial 
ribs, of which 24 occur upon the first, 32 upon the second, and 34 upon the 
penultimate turn. In addition to the axial ribs, the whorls are marked by 
spiral cords which equal the ribs in strength; of these cords, 4 occur upon 
the first and second turns, the space between the summit and the first cord 
is considerably wider than that between any two of the cords and forms a 
sloping shoulder. On the penultimate whorl, this space is marked by two 
additional cords, one of which is at the summit and the other is halfway 
between this and the next cord. The spaces inclosed between the axial ribs 
and the spiral cords are elongated pits, which have their long axes parallel 
to the spiral sculpture in all cases except the median, where the pits are 
squarish. Suture strongly channeled. Periphery of the last whorl marked 
by a spiral sulcus equal to the one separating the first and second supra- 
peripheral cords. Base moderately long, well-rounded, not attentuated 
anteriorly, marked by six, equal and equally spaced, spiral cords and very 
feeble continuations of the axial ribs, which here appear as very slender 
threads. Aperture broadly oval; posterior angle obtuse; outer lip thin, 
showing the external sculpture within; inner lip very strongly curved and 
slightly reflected; parietal wall covered with a moderately strong callus, 
which renders the peritreme complete. Length, 2; diameter, 1.1 mm. 
(Bartsch.) 
Type in United States National Museum, No. 17728. Type locality, 
Neah Bay, Washington. 
Range. Forrester Island, Alaska, to Neah Bay, Washington. 
