126 APPENDIX. 



Genus XIX— VERTIGO. 



Vertigo sexdentula, pi. XXIV, f. 23. 

 Animal like Bulimus, with only two elongate, claviform ten- 

 tacles, the lower pair being either wanting or only rudimentary. 



Genus XX.— AZECA. 

 Animal like Bulimus, the upper tentacles claviform. 



Genus XXI._HELIX. 



Section 1. — Mantle thin, never protruding beyond the shell; 

 body granular, and destitute of grooves ; lips short, and 

 rounded. 



Helix aspersa, pi. XXV, f. 5, and H. nemoralis, f. 2. 



Animal with an elongated, depressed foot ; body large, and 

 central ; head and eyes retractile, within the skin, which enve- 

 lopes them as a sheath. — Eggs of H, pomatia, f. 1 1 ; eggs of ff- 

 nemoralis, f. 9- 



Section 2. — Neck granular. 

 Helix lapicida, pi. XXV, f. 4. 



Section 3. — Foot short, and hyaline. 

 Helix cellaria, pi. XXV, f. 3. 



ORDER GASTEROPODA. 

 Genus I.— VITRINA. 



VlTRINA PELLUCIDA, pi. XXV, f. 1. 



Animal with an elongated, lanceolate body ; mantle partly 

 internal, and shield-shaped, rough in front. 



Genus II.— TESTACELLA. 



Animal with an elongated body, narrowed in front, and 

 provided with two divergent grooves, issuing from the fore 

 part of the mantle, and terminating at the head ; mantle small, 

 covered with an auriform shell, situate on the hinder part of 

 the body. 



