STENOPUS. Guild. ([Greek: Stenos], narrow, [Greek: pous], foot.) A genus nearly "allied to the Linnæan Helices, from all of which it differs in the curious contraction of the pedal disc, and the caudal tentaculum furnished with a gland beneath." The shell is described as heliciform, umbilicated, transparent, with the aperture transverse. The two species described are Stenopus cruentatus and lividus; they are both from the Caribbæan Islands, Guild. Zool. Journ. xii. p. 528, tab. 15, f. 1 to 5. STOMATELLA. Lam. See STOMATIA. STOMATIA. Auct. ([Greek: stoma], _stoma_, mouth.) _Fam._ Macrostomata, Lam.--_Descr._ Sub-orbicular, oblong, auriform, variegated without, iridescent within; spire depressed; aperture entire, very wide, oblique; peritreme uninterrupted. _Obs._ This genus is known from Haliotis by being destitute of the series of holes; is distinguished from Sigaretus by the substance of the shell, the latter being internal, and never pearly. Our description includes STOMATELLA, Lam. The Stomatiæ are marine, and belong to the East Indies and New Holland. Fig. 335, S. Phymotis. STORILLUS. Montf. 1, 131. A genus of microscopic Foraminifera, included in the genus Rotalites in M. De Blainville's system. STRAPAROLLUS. Mont. A genus containing some species of HELIX, Auct. Generic characters not defined. STREPTAXIS. Gray. _Fam._ Colimacea, Lam.--_Descr._ Ovate, or oblong; when young, sub-hemispherical, deeply umbilicated, with rapidly enlarging whorls. At length the penultimate whorl is bent towards the right and dorsal side of the axis, and the umbilicus becomes depressed, and often nearly closed. The mouth is lunulate, the edge slightly thickened and reflected, and often with a single tooth on the outer side of the inner lip.--_Obs._ This genus of land shells is separated from Helix on account of the eccentricity of the penultimate whorl. S. contusa, fig. 269. STRIATED. (_Stria_, a groove.) Marked with fine grooves or lines. STRIGOCEPHALUS. Defr. PENTAMERUS, Sow.? GYPIDIA, Dalman.