HELICINIDA. 243 
1. LoucrpELLA AUREOLA. B. M. 
Shell depressed-conoidal, rather thin, crowdedly striated concen- 
_. trically, purplish-fuscous or straw-coloured, very faintly shining ; 
spire conoidal, pointed; whorls almost 6, rather flattened, the 
last one slightly angulated on the periphery (the angle being 
sometimes rather knotty), flattened beneath and impressed on 
the centre, contracted anteriorly, with two grooves; aperture 
very oblique, sinuately triangular; columella very short, pass- 
ing immediately into the peristome, which is furnished with 
two teeth, white, broadly expanded above, reflexed beneath. 
Operculum very thin, rather concave externally, pale, horn- 
coloured-yellow. Height 54, greatest breadth 83, least br. 
74 mill. 
Cochlea, n. 12, Browne, Jamaic. t. 40, f. 3. 
Helix (Helicodonta) aureola, Féruss. Prodr. n. 90; Hist. t. 48, f. 1, 
t. 49, A. f.1; Wood, Ind. Suppl. t. 8, f.65; Désh. in Lam. Hist. 
vill. p. 109, n. 172. 
Helix areola, Petit, in Journ. Conch. 1851, i. p. 86, t. 1, f. 10. 
Helicina aureola, Gray, in Zool. Journ. i. p. 70, t. 6, £15; Sow. 
Thes. n. 5, p. 3, t. 1, f. 44-46. 
Lucidella aureola, Swains. Malacol. p. 330; Pfr. in Z. f. M. 1848, 
p. 82; Ic. Helicine, p. 9, t. 5, f. 21-23; Adams, Contrib. to 
Conch. pp. 16, 181; Pfr. Pneum. Mon. p. 337. 
Hab. Jamaica. 
IV. HELICINA. 
Operculum semiovate, membranaceous or shelly. Shell heliciform, 
turbinate, globose or depressed, covered beneath with callus 
round the columella, which is rather straight and somewhat 
flattened; aperture triangular or semiovate, entire; peristome 
simple, straight or thickened, often spreading broadly. 
Helicina, Lamarck, 1799, Prodr. p. 76; 1801, Syst. An. p. 94 (type, 
H. neritella) ; 1804, Ann. du Mus. v. p.91 (character, not spec.) ; 
fist. vi. 2, p. 102; Ed. Désh. viii. p. 153; Gray, in Zool. Journ. 
i. p. 62; Syn. Br. Mus. ed. 1842, p.91; Guild. in Zool. Journ. 
lil. p. 528; Pfr. in Ohemn. Conch. ed. nov. i. 18, p. 10 (excluding 
Alcadia); Pnewm. Mon. pp. 338, 420. 
Helicina (sp.), Sow. &e. 
Olygyra, (orbiculata), Say, in Journ. Acad. Philad. i. p. 283; Rang. 
Man. Malac. 
Pachytoma and Olygyra, Swains. Malacol. p. 337. 
Oligyra, Gray, in Proc. Z. S. 1847, p. 182, n. 531 (misprint). 
Olygira (Neritella), Blainv. Man. Malac. 441, 1825 (misprint). 
