MOLLUSCA. 
405 
minent; aperture entire, oblong, and large; right lip elevated as 
much as the pillar; back with transverse tuberculated ribs. 
Stomatia phymotis. —The Tumoured Stomatia. 
Plate LXXXV. fig-. 29. 
Ovate-oblong, back convex, striated, nodulous, and white; 
spire small, contorted ; lip thin and acute. Three and a fourth 
inches long. Inhabits the Indian Ocean. 
Genus 52.—STOMATELLA.— Lamarck. 
Generic Character. —Shell orbicular or oblong, ear-shaped, 
imperforate ; aperture entire, large, elongated; outer lip effuse, 
dilated, and open. 
Stomatella imbricata. —The Imbricated Stomatella. 
Plate LXXXV. fig. 30. 
Suborbicular, convex, somewhat depressed, rough, having 
thick-set transverse ribs, covered with imbricated scales; gray¬ 
ish-brown. One inch and a half long. Inhabits the Indian 
Ocean. 
Genus 53. — SIGARET US.— Lamarck. 
Generic Character .—Shell subauriform, suborbicular; outer 
lip short and spirally intorted; aperture entire, very expanding, 
ovate-oblong; the margins disunited. 
Sigciretus concavus. — The Concave Sigaretus. 
Plate LXXXV. fig. 25. 
Ovate, back convex, covered with transverse undulated strife; 
reddish-yellow, spire white, somewhat prominent; aperture ex¬ 
panded, concave; umbilicus deepish. Inhabits the Indian Ocean. 
TRIBE V.-IANTHIMIA. 
Animal capable of raising itself to the surface of the water, 
and floating. 
Genus 54.—I A N T HI N A.— Lamarck • 
Generic Character. —Shell ventricose, conical, thin, and pel¬ 
lucid; aperture triangular; columella straight, produced beyond 
