CLASS GASTROPODA 
159 
Shell elongate, slender, very elegant; with two nuclear whorls, quite 
large, strongly sloping, smooth, with covered apex; 5 swollen, above 
scarcely subangulate, with sutures strongly impressed; with 10 larger 
rotund radial costae, at the base obsolete, with wavy interstices; with a 
few spiral lirulae, somewhat distant, crossing gracefully over the ribs and 
interstices, in the rear 2 smaller, in the middle at first 3, afterward 6 
more frequent, around the attenuated base six distant lines; aperture 
subquadrate, in front dilated; outer lip acute; inner lip inconspicuous ; 
columella with 2 smaller oblique plications, inserted in front, like a tertiary 
fold, but scarcely emarginate. (Translation.) 
Type in? Type locality, Santa Barbara, California, Post-Pliocene. 
Range. Arctic Sea to San Diego, California. Fossil: Pleistocene of 
California. 
Admete californica Dali, 1908 
Plate 11, fig. 6 
Bulletin, Museum of Comparative Zoology, 43, No. 6: 296; PI. 4, fig. 4. 
Shell thin, turreted, with five whorls beside the nucleus; white, with a 
pale, olivaceous periostracum; nucleus blunt, turgid, of about a whorl and 
a half, smooth but not polished; subsequent whorls with a prominent 
angular shoulder, above which the whorl is tabulate, the angulation becom¬ 
ing obsolete in the last whorl of the adult shell; in the early whorls the 
space between the angle and the suture behind it is nearly smooth and 
flat, later it has faint spiral threads and becomes more convex; axial 
sculpture of numerous (on the penultimate whorl, about twenty) low 
rounded ribs, with shallow, subequal interspaces, strongest at the angle, 
obsolete on the tabulation and on the last whorl, extending on the spire to 
the succeeding suture; the incremental lines are also rather conspicuous; 
spiral sculpture in front of the angle of (on the spire, about four, on the 
last whorl, about 20) low, rounded, subequal, spiral threads with wider 
interspaces, a little turgid where they cross the ribs, especially on the spire, 
and more crowded on the last whorl, anteriorly, where they extend to the 
brink of the umbilicus; aperture subtriangular, the outer lip thin, not 
reflected; body with a thin wash of callus; pillar thin, straight, with three 
plications, the middle one strongest; canal obsolete or none; umbilicus 
rather large, funicular, its walls vertically striate, the opening partly con¬ 
cealed by the pillar lip; in the young the umbilicus is relatively much 
smaller; operculum absent. Length of shell, 16; of last whorl, 11; of aper¬ 
ture, 8; max. diam., 8.3 mm. (Dali.) 
[159] 
