MOLLUSCA. 
4i5 
and transversely striated ; reddish horn-coloured ; body carinated. 
Seven-eighths of an inch in breadth. Inhabits dry situations in 
.Europe. 
Genus 81. — HELIX.— Linnceus. 
Generic Character .—Shell orbicular, convex or conoid above ; 
sometimes globular, with the spire somewhat elevated; aperture 
entire, transverse, very oblique contiguous to the axis of the 
shell; having the margin disunited by the projection of the body. 
Helix arbustoruni. — The Grove Helix. 
Plate LXXXVI. fig-. 27. 
Subglobular, subumbilicated, finely striated longitudinally; 
greenish-yellow, beautifully mottled, and streaked with reddish- 
brown, and a broad brown band running throughout the middle 
of the volutions. One inch in diameter. Inhabits the groves 
and woods of Europe. 
ORDER IV.—GASTEROPODA. 
Animals with straight bodies, and never spiral, nor enveloped 
entirely in a shell, having a foot or muscular disk under the ab¬ 
domen, attached to the body nearly its whole length, and serving 
for progressive motion. 
Section I.— Pneumobranchihe 
Branchire, constructed like a vascular net, on the wall of 
a particular cavity, opening by a perforation which the animal 
has the power of contracting and dilating at pleasure. They 
respire air. 
TRIBE I.-LIMACINEA. 
The animals almost wholly naked, with elongated bodies ; and 
they creep by means of a ventral disk, with a narrow mantle bor¬ 
dering their sides. 
Genus 1. — VIT RINA.— Lamarck. 
Generic Character .—Body creeping, elongated, snail-shaped, 
