APPENDIX 
291 
the tilted edge of the last volution only projects. The nuclear spire is so 
obliquely placed that it gives the apex of the shell a truncated appearance. 
Postnuclear whorls very slightly rounded, not appressed at the summit, 
marked by rather strong, and deeply incised spiral lines; one a little heavier 
than the rest is situated a little below the summit and gives to this the 
appearance of being slightly keeled. In addition to this sculpture the 
whorls are marked by rather coarse lines of growth. Periphery of the last 
whorl angulated. Base short, well-rounded, not umbilicated, marked by 
the continuation of the axial ribs and incised spiral lines, which equal those 
on the spire in strength. Aperture pear-shaped; posterior angle acute; 
outer lip thin; columella slightly curved, reflected over and appressed to 
the base for its posterior two-thirds, and provided with a strong oblique 
fold opposite the umbilical chink; parietal wall covered with a heavy callus. 
Type in United States National Museum, No. 362545. Type locality, 
Point Fermin, California. It has 4.8 whorls and measures, length, 2.2 mm.; 
diameter, 1.2 mm. 
Odostomia strongi Bartsch, 1927 
Proceedings of the United States National Museum, 70: 19; PI. 4, fig. 4. 
Shell small, elongate-ovate, pale yellow, translucent. Nuclear whorls 
deeply obliquely immersed in the first postnuclear whorl, only half of the 
last turn showing, which is well-rounded and smooth. The early post¬ 
nuclear whorls moderately rounded, marked by strong spiral grooves 
which separate the whorl into equal cords, of which 10 occur on the 
second whorl in the type. On the third whorl these cords become very 
much enfeebled and on the last they are entirely obsolete. On the last 
whorl the incremental lines are more conspicuous than on the preceding 
turns, probably largely due to the absence of spiral sculpture. Suture well- 
impressed. The portion at the summit of the shell appressed to the pre¬ 
ceding turn appears as an opaque band. Periphery well-rounded. Base 
rather long, well-rounded, not umbilicated. Aperture elongate oval; outer 
lip thin, rather sigmoid; inner lip thin, reflected over and appressed to the 
base for three-fourths of its length, the anterior portion only being free, 
provided with a fold at the insertion of the columella; parietal wall covered 
by a thin callus. 
Type in United States National Museum, No. 347804. Type locality, 
Catalina Island. It has almost four postnuclear whorls and measures, 
length, 3.5 mm.; diameter, 1.8 mm. 
[ 589 ] 
