Bulletin - United States National Museum - Smithsonian Institution

166 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
numerous equal and equally spaced, very fine, spiral striations and
equally fine, decidedly, retractively, curved lines of growth, the com-
bination of the two lending the surface a minutely reticulated ap-
pearance. Sutures well impressed. Periphery of the last whorl well
rounded. Base moderately rounded, depressed at the umbilical area
which is covered by a strong callus. The. base, excepting the um-
bilical area, which is smooth, is marked like the upper surface.
Aperture exceedingly large, very oblique, subcircular; outer lip thick
within, thinning to a sharp edge; inner lip very thick, strongly
curved; parietal wall covered with an exceedingly thick callus, which
renders the peritreme complete.
The type, Cat. No. 186865a, U.S.N.M., comes from Port Alfred
(Coll. No. 235a). It measures: Altitude, 1.1 mm.; greater diameter,
2 mm.
Cat. No. 250537, U.S.N.M., contains another specimen from Port
Alfred (Coll. No. 1410).
Family LIOTIIDAE.
Genus ILAIRA A. Adams.
ILAIRA FULGENS Gould.
Plate 29, figs. 4, 5, 6.
Liotia fulgens Gould, Proc. Boat. Soc. Nat. Hist., vol. 7, p. 142, 1859.
Shell planorboid, yellow horn colored, with axial streaks of pale
brown , and pearly iridescence shining through here and there. Whorls
slightly rounded on the anterior half with a depressed concave area
centering on the third, the outer fourth being flat. Entire surface
marked by fine lines of growth only. Periphery of the shell with two
very strong lamellar keels which inclose a broad deep channel between
them. Base with a broad funnel-shaped umbilicus which is
limited externally by a strong, well rounded, spiral cord. The space
between the basal peripheral keel and the umbilical cord is flat.
Aperture rendered pentagonal by the three cords, the posterior angle,
and the junction of the basal lip with the columella.
Gould's type, Cat. No. 156, U.S.N.M., was collected by William
Stimpson on the North Pacific Exploring Expedition at Simon's Bay,
Cape of Good Hope. It has four whorls, and measures: Altitude,
2.2 mm. greater diameter, 5 mm. ; lesser diameter, 4 mm.
;
Three additional lots of this species are in the collection from Port
Alfred: Cat. No. 250535, U.S.N.M., one young specimen (Coll. No.
1408); Cat. No. 250559, U.S.N.M., another young specimen (Coll.
No. 1432) ; Cat. No. 250560, U.S.N.M., also a young specimen (Coll.
No. 1433).
Genus LIPPISTES Montfort.
LIPPISTES GRAYI Adams.
Cat. No. 187148, U.S.N.M., two specimens from Port Alfred (Coll.
No. 695).