APPENDIX 
Since Parts I and II went to press, the following descriptions of new 
species were received. Genus Astyris, now so-called by Bartsch, was 
given in Bulletin 112 as a subgenus and so arranged in this volume, Part I, 
p. 274. Dali also listed Genus Opalia as a subgenus (see supra, p. 51). 
Subgenus Astyris (see Part I, p. 274) 
Astyris clementensis Bartsch, 1927 
Proceedings of the United States National Museum, 70: 2; PI. 1, fig. 5. 
Shell very small, elongate-ovate. Nuclear whorls flesh-colored. Post- 
nuclear turns yellowish horn-colored with various zigzag markings and 
fulgurations of brown. Nuclear whorls smooth. Postnuclear whorls ap- 
pressed at the summit, marked by very fine lines of growth which are 
almost vertical, and numerous, closely spaced, microscopic spiral stria- 
tions. Suture very slightly constricted. Periphery of the last whorl well- 
rounded. Base long, moderately rounded; columella marked by eight 
feebly developed spiral cords. Aperture large; posterior angle acute, de¬ 
cidedly channeled anteriorly; outer lip thin showing the external markings 
within; inner lip sinuous; parietal wall covered with a thin callus. 
Type in United States National Museum, No. 362456. Type locality, 
San Clemente Island, California. Length, 3.2 mm.; diameter, 1.5 mm. 
This species is nearest related to Astyris aurantiaca Dali, but is uni¬ 
formly smaller. 
Subgenus Opalia (see p. 51) 
Opalia tremperi Bartsch, 1927 
Proceedings of the United States National Museum, 70: 3; PI. 1, fig. 8. 
Shell moderately large, milk-white. Nuclear whorls decollated. Post- 
nuclear whorls marked by poorly developed, retractively slanting axial 
ribs which terminate at the summit in a series of cusps. Several ribs fre¬ 
quently fuse to form a single cusp. The ribs on the first two turns of the 
type are obsolete, on the third 20 are present, while the fourth has 22, the 
fifth 24, the sixth and last have 26. In addition to the axial sculpture there 
are also obsolete varices at irregular intervals. The entire surface of the 
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