UNIVALVES —.HELIX. 161 
HELIX.—Swnait or Sprra.. 
DESCRIPTION OF PLATE XXIX. 
Diy. I. — Fam. 3. Fig. 3. H. gualteriana. 
Div. IV.—Fam.1. Fig. 1. H. dextrae Div. VI.—Fig. 5. H. glauca. 
Div. V.—Fig. 2. H. amarula. Div. VII.—Fig. 4. H. scarabeus, 
Div. XIL—Fam. 1. Fig. 6. H. decollata, 
Shell univalve, spiral, subdiaphanous, britiJe; aperture contracted, 
semilunar, or roundish. 
THE numerous species which compose this extensive 
genus are principally land or fresh water shells, a very 
few only being the produce of the ocean. They are 
generally of a delicate and brittle structure, and somes 
times transparent. 
Among the carmated Helices, which constitute the 
first division, may be particularised the H. lapicida, H. 
marginata, and H. cicatricosa. The more compressed 
or flattened species are usually called Antique Lamps; 
the H. lampas, H. carocolla,and H. lucerna are illus- 
trative specimens. 
The H. cornea and H. vortex are characteristic of the 
two families of the depressed species of the second di- 
vision. 
The third division is distinguished by the sub-lunate 
form of the aperture, and contains some of the most 
rare and beautiful species of the genus. Of these the 
H. sultana and H. hemastoma are most celebrated, the 
latter, in particular, for its elegant bandings and rose= 
colored lip. The H. pomatia is an inhabitant of the 
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