CLASS GASTROPODA 
101 
Alvania acutilirata Carpenter, 1866 
Plate 82, fig. 3 
Proceedings of the California Academy of Sciences, 3:217. Proceedings of the United 
States National Museum , 41:352; PI. 31, fig. 3. 
R.t. tenui, satis turrita, rufo-cinerea, marginibns spirae parum excur- 
vatis; anfr. nucl. iii. normalibus laevibus, vertice parum matnillato; norm, 
iii. subrotundatis, suturis valde impressis; liris radiantibus circ. xviii. acutis 
distantibus, ad peripheriam evanidis; lirulis acutis spiralibus distantibus 
circ., xv., quarum vi. in spira monstrantur, liris radiantibus et interstitiis 
latis, undatis, eleganter superantibus, haud nodulosis; basi rotundata, haud 
umbilicata; apertura ovata, peritremati continuo. (Carpenter.) 
Shell small, ovate, yellowish-white, with the base of the columella and 
the posterior angle of the aperture purplish chestnut brown. Nuclear 
whorls two and one-half, small, strongly rounded, smooth. Post-nuclear 
whorls very feebly shouldered at the summit, marked by regular, slender, 
slightly protractive, axial ribs, which are about half as wide as the spaces 
that separate them. Of these ribs, 24 occur upon the first, 22 upon the 
second, and 20 upon the penultimate turn. In addition to the axial ribs, 
the whorls are marked by slender spiral cords, which are a little more 
than half as strong as the axial ribs, and about half as wide as the spaces 
that separate them. Of these cords, 6 occur between the sutures on the 
first, and 7 on the second and the penultimate turn. The spaces inclosed 
between the axial ribs and the spiral cords are elongated pits, having their 
long axes parallel to the spiral sculpture. Suture well-impressed. Periphery 
of the last whorl marked by a well-rounded, spiral cord, at the posterior 
edge of which the axial ribs terminate. Base well-rounded, feebly pro¬ 
duced anteriorly, marked by 8 spiral cords, which grow successively 
weaker and more closely spaced from the periphery to the umbilical region. 
Aperture broadly oval; posterior angle acute; outer lip rather thin at the 
edge, thinner within, showing the external sculpture within; inner lip 
moderately stout, strongly curved, and reflected over and appressed to the 
base; parietal wall covered with a thick callus, rendering the peritreme 
complete. Length, 2.3; diameter, 1.2 mm. (Bartsch.) 
Type. Figured specimen in United States National Museum, No. 
153072. Type locality, San Diego, California. 
Range. Known only from type locality. 
Alvania dinora Bartsch, 1917 
See Part II, Plate 67, fig. 5 
Proceedings of the United States National Museum, 52:678; PI. 46, fig. 5. 
Shell small, elongate-ovate, yellowish-white. Nuclear whorls two, 
I 703 1 
