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ORDER III. TRACHELIPODA. 
THE shells of this Order are spirivalve, ensheathing. It is separated into Two Sections, 
viz. Phytiphaga and Zoophaga. 
SECTION I TRACHELIPODA PHYTIPHAGA. 
Aperture of the shell entire; base without any ascending dorsal notch or canal. 
This Section contains Ten Families, viz. Colimacea, Lymnaeana, Melaniana, Peristomi- 
ana, Neritacea, Janthinea, Macrostomiana, Plicacea, Scalariana, and Turbinacea. 
COLIMACEA. — 11 Genera. 
Shell spirivalve, with no other projecting parts on the exterior than the strive of growth; the right mar- 
gin of the aperture is often recurved or refected oulivards. 
Helix. — Shell orbicular, convex, or conoidal; sometimes globular, the spire rather ele- 
vated: aperture entire, transverse, very oblique, contiguous to the axis of the 
shell; the margins disunited by the projection of the penultimate whorl. 
Plate XIV. Fig. 17. H. haemastoma. (Idem. — Linn.) 
Carocolla.— Shell orbicular, more or less convex or conoidal above ; the circumference 
or periphery angulated or keeled : aperture transverse, contiguous to the axis of 
the shell; the right margin or lip subangular, often toothed or plaited beneath. 
Plate XIV. Fig - . 16. C. albilabris, (Helix carocolla.— Linn.) 
Anostoma. — Shell orbicular, the spire convex and obtuse : aperture round, toothed with- 
in, grinning or shewing the teeth, turned upwards to the side of the spire; the 
margin of the lip reflected. 
Plate XIV. Fig. 18, 18 (a). A. globulosa. [Mrs. Mawe’s Cabinet.] 
Helicina. — Shell subglobular, imperforate : aperture entire, demi-oval. Columella cal- 
lous, transverse, rather flat, margin acute, forming an angle at the lower base of 
the right lip : operculum corneous. 
Plate XV. Fig. 1. H. major. [Gray, in Zool. Jour. Vol. I. p. 251.] 
Pupa. — Shell cylindrical, generally thick: aperture irregular, demi-oval, the lower part 
rounded and subangular; the margins nearly equal, reflected outwards, disunited 
at the upper part by an interposed columella lamina, always affixed. 
Plate XV. Fig. 2. P. mumia. 
Clausilia. — Shell mostly fusiform, slender, the summit rather obtuse : aperture irregular, 
rounded-oval; the margins united throughout, free, reflected outwards. 
Plate XV. Fig. 3. C. torticollis. 
Rulimus. — Shell oval, oblong, or turreted; aperture entire, longitudinal; the margins ve- 
ry unequal, disunited at the upper part. Columella straight, smooth, the base 
entire, not channelled. 
Plate XV. Fig. 4. B. citrinus. (Helix perversa. Variety b.— Linn.) [Mrs. Mawe’s Cabinet.] 
