download pdf

NATICIDAE 187
Subgenus Glossaulax Pilsbry 1929
Polinices reclusianus Deshayes Recluz's Moon-shell
Crescent City, California, to Lower California.
Plate 2oi
1V2 to 1V2 inches in length, very heavy for its size. Spire moderately to
quite vi^ell elevated. Exterior semi-glossy, grayish with rusty-brown or green-
ish stains. Characterized by a large, tongue-like callus, brownish or white in
color, which may or may not cover the entire umbilicus. There is a strong
white, reinforcing callus at the top of the inside of the aperture. Operculum
translucent, reddish brown. The shape of shell and degree of development of
the umbilical callus is variable, and has received various names
—
alms Arnold
and imperforatus Dall. A common shallow water species also found as deep
as 25 fathoms.
Polmices draconis Dall Drake's Moon-shell
Alaska to Lower California.
Figure 43a
2 to 2 % inches in length, very similar to Lunatia leivisi, but with a wider
more elongate umbilicus, and with a very small, almost obsolete callus above
the umbilicus. Uncommon in waters from i o to 2 5 fathoms.
Genus Sigatica Meyer and Aldrich 1886
Sigatica carolinensis Dall Carolina Moon-shell
North Carolina to southeast Florida and the West Indies.
Plate 22I
^/4 inch in length, white, glossy, ovate, fairly thin-shelled; umbilicus
deep, round, without a callus. Characterized by 2 smooth nuclear whorls,
followed by 3 whorls which are finely grooved by about 20 spiral lines.
Suture well-channeled. Operculum paucispiral, corneous, its early whorls
thickened and raised somewhat. S. holograpta McGinty is so similar that it
may well be this species. Dredged 20 to 95 fathoms; not uncommon.
5. se?nisulcata Gray from West Florida and the West Indies reaches 34
inch in size, has 5 to 6 spiral Hnes cut into the top third of the whorl, and a
few within the umbilicus. Often confused with Polinices lacteus. Rare.
Genus Amauropsis Morch 1857
Amaiiropsis islandica Gmelin Iceland Moon-shell
Arctic Seas to off Virginia.
Plate 2 2r
I to 1^/2 inches in length, % as wide, rather thin, but strong. Suture