180 PULMONATA. 



Tribe 4. VITRIXIXA. 



The mantle produced and thickened in front beyond the front 

 edge of the shell, forming a thick fleshy corrugated collar. 



Vitrinina, Gray, Turton's Man. ed.2. 109, 1840; P. Z. S. 1847, 



170. 

 Vitrinoidea, part., Fitz. 



Synopsis of Genera. 



1. Helicolimax. Mantle covering nearly the whole of the 



shell. 



2. YiTRiNA. Mantle covering the front edge of the last whorl 



and a part of the spire of the shell. 



3. ? SiMPULOPSis. Animal . Shell half ovate, very thin, 



membranaceous. Whorls three or three and a half ; last 

 veutricose. Aperture large, oblong or rounded, oval. 



1. HELICOLIMAX. 



Mantle produced before and behind so as to cover nearly the 

 whole of the shell when fully expanded. Shell depressed, "thin. 

 TMiorls rapidly enlarging. Mouth verj- large. Columella with 

 a wide membranous margin. 



1. Helicolimax Lamarckii. B.M. 



Shell depressed, oval, smooth, thin, bright, greenish-homv ; 

 spire nearly level ; whorls two and a half, rapidly increasing, in- 

 terual margin free ; aperture ample, nearly horizontal, ear-shaped; 

 peristome simple, upper margin arched-dilated in front, columel- 

 lar widely membranous-margined. Lat. maj. 15, min. 10, alt. 

 oi mill. 



Hehcohmax Lamarckii, Fer. Pr. v. 21 ; Hist. t. 9. f. 9. 



Lowe in Zool. Journ. iv. 338. t. suppl. 38. 

 Vitrina Lamarckii, Gray, Ann. Phil. 1825, ix. 409. 



Lowe, Faun. Mader. 40. t. 5. f. 1. 



Webb ^- Berth. Syn. p. 311. 



Orb. Canar. p. 53. 



Beck, Ind. p. 2. n. 13. 



Pfr. Mon. Helic. ii. 506 ; Icon. t. I. f. 48-51. 



Desh. Helic. 96. 20 F. n. 8. t. 8. f. 22, 26. 

 Vitrina Teneriffa?, Quoy S,- Gaim. Astrol. ii. 142. t. 13. f. 4-9. 



Lam. ed. Desh. vii. 729. n. 4. 

 Vitrina Cuneri, Sow. Gen. f. 2 {Lowe). 

 Hab. Canaries; TenerifFe; Madeira. 



