108 GASTEROPODA. 



and spirally bent ; posterior appendages of the mantle dis- 

 played over part of the shell; four tentaeula; the anterior 

 very short. Shell small, extremely thin, depressed, spire 

 very short ; body very large ; aperture ample, rounded, and 

 oval ; the left margin slightly inflected. 



Vitrina peliucida The Pellucid Vitrina. Plate 



XIII. fig. 5. Extremely thin, pellucid, and glossy ; de- 

 pressed, with the spire very short ; of a pale yellowish 

 green ; aperture large and oval. Four lines long. Inhabits 

 dry places of Europe. 



Genus 2 TEST ACELLX.— Lamarck. 



Generic Character. — Body creeping, elongated, snail- 

 shaped, having a shell on the posterior extremity ; four 

 tentaeula, the two longest with the eyes at their tips ; vent 

 and respiratory aperture 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 Tes- 



TACELLA. Plate XIII. fig. 23. Shell oblong-ovate, auri- 

 form ; left margin slightly reflected ; exceedingly thin, 

 transparent, and yellowish. Inhabits the middle provinces 

 of France. 



Genus 3. — LIM AX.— Zmn^ws. 



Generic Character. — Body oblong, naked, and creeping; 

 back convex, provided with a coriaceous slightly wrinkled 

 shield; and having a flat longitudinal disk beneath; tentaeula 

 four, retractile, 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 very small, 

 internal, extremely thin, oblong, ovate, flattened. 



Limax rufus The Red Limax. Plate XIII. fig. 29. 



Shell ovate-oblong, both margins reflected ; very thin, dia- 

 phanous, slightly wrinkled, and of a pale straw-yellow 

 colour; animal with the body longitudinally sulcate, red 



