HELIX. 893 



ing to MuUer, sometimes seven whirls, which aie finely stri- 

 ated transversely, and Mulier says that young shells have also 

 conceutrical lines with minute elevated dots, which are only 

 discoverable with the help of a glass ; young shells have a 

 distinct keel on the body-whirl, which afterwards becomes 

 obsolete ; the umbilicus is very large and deep. 



LEUCAS. 14. Shell iimbilicated, slightly keeled, 

 convex, and smooth ; base gibbous, and the 

 umbilicus very minute ; aperture roundish- 

 lunated. 



Helix Leucas. LinrKEus Syst. Nat. p. 1242. Gmelin, p. 

 3616. 



Inhabits Africa. Lirmatis. 



Linnseus has not mentioned the size, or given any reference, 

 but to the above character has only added that the shell is 

 white, with a band above and purplish lines below. Chem- 

 nitz doubts whether it may not be a Variety of H. vermicu- 

 lata. 



L^viPES. 15. Shell umbilicated, slightly depressed, 

 and somewhat keeled ; whirls reversed, and 

 minutely striated transversely. 



Helix laevipes. Mulier Verm. ii. p. 22. Chemnitz, ix. 

 part 1. p. 83. t. 108. f. 915 and 91 6. Gmelin, p. 36l6. 

 Helix Candida. Gmelin, p. 36 16. 



■ Helix hyalina. Gmelin, p. 3640. 

 Helix, No. 45. Kammerer Cab. Kudolst. p. 172. 

 Martini n. Mannigf. iv. p. 423. t. 3. f. 22 and 23. 



Inhabits Guinea. Martini. Tranquebar. Chemnitz. 



Shell about an inch in diameter, thin, pellucid, and of a W'hitish 

 colour, generally with a red band united to a white one at 

 the margin of the whirls ; it has five reversed whirls, mi- 

 nutely striated transversely, and the aperture has its margin 

 acute. Mulier says it somewhat resembles H. exilis, but 

 has the spire less depressed, the whirls reversed, and the base 

 more convex. Chemnitz has quoted Martini's figures for 

 this species, 



EXILIS. 16. Shell umbilicated, flattish, slightly keel- 

 ed, and the whirls sharply striated transverse- 

 ly ; aperture with an acute margin. 



Helix exilis. Midler Verm. ii. p. 22. Chemnitz, ix. part 

 2, p. 121. t. 129. f. 1149. Gmelin, p. 36 16. 



