416 
MOLLUSCA. 
nearly straight; posteriorly separated from the foot, and spirally 
wound into a shell; the various posterior appendages of the 
mantle displayed over part of the shell; four tentacula; the ante¬ 
rior very short; shell small, extremely thin, depressed, spire 
very short; body very large; aperture ample, rounded and oval ; 
the left margin slightly inflected. 
Vitrina pellucida. — The Pellucid Vitrina. 
Plate LXXXVI. fig. 5. 
Extremely thin, pellucid, and glossy; depressed, with the 
spire very short; of a pale yellowish green; aperture large and 
oval. Four lines long. Inhabits dry places of Europe. 
Genus 2. — TESTACELLA.— Lamarck. 
Generic Character. —Body creeping, elongated, snail-shaped, 
having a shell on the posterior extremity ; four tentacula, the two 
longest with the eyes at their tips; vent and respiratory organs 
behind; shell very small, external somewhat ear-shaped; the 
apex obsoletely spiral; aperture very large, oval, with outer lip 
inflected. 
Testacella Haliotidea — The Haliotis-Shaped Testacella. 
Plate LXXXVI. fig. 23. 
Shell oblong-ovate, auriform ; left margin slightly reflected ; 
exceedingly thin, transparent, and yellowish. Inhabits the mid¬ 
dle provinces of France. 
Genus 3.—LIMAX.— Linnaeus. 
Generic Character. —Body oblong, naked, and creeping; back 
convex, provided with a coriaceous slightly wrinkled shield, 
which has a flat longitudinal disk beneath ; tentacula four, re¬ 
tractile, the two posterior the largest, with eyes at their tips; 
branchial cavity placed under the shield ; orifice for respiration 
and vent on the right side ; shell small, extremely thin, oblong, 
ovate, not convolute, but with a cavity at top. 
Limax Rufus .— The Red Limax. 
Plate LXXXVI. fig. 29. 
Shell ovate-oblong, both margins reflected ; very thin, dia. 
