TROCHATELLA §. 4. 
337 
striatus; apertura perobliqua, subtriangularis; columella sim- 
plex, immediate in marginem basalem abiens; perist. incras- 
satum, angulatim expansum, marginibus callo tenuissimo junc- 
tis, supero sinuato. — Operc. ? — Diam. maj. 10y 2 , min. 8, 
alt. 7 */ a mill. (Mus. Cuming.) 
Helicina semilirata (Trochatella) Pfr. in Proc. Zool. Soc. 1848. p. 124. 
Trochaiella semilirata Pfr. in Zeitschr. f. Malak. 1848. p. 82. 
— — Chemn. ed. II. Tr. N. 3. p. 5. t. 6. f. 15. 16. 
Habitat in Venezuela (Linden). 
HI. Lucidella Swainson. 
Operculum membranaceum , semiovale , margine columel- 
lari yix incrassato. — Testa depresse heliciformis, basi minime 
callosa; apertura sinuato-triangularis ; peristoma crassum, den- 
tibus validis munitum. 
Lucidella Swains. Malacol. p. 330 (sectio Lucernellae). 
— Gray Syn. Brit. Mus. Ed. 1842. p. 91 ; Proc. Zool. Soc. 1847. 
p. 182. N. 532. 
— Pfr. in Zeitschr. f. Mai. 1847. p. 152. 1848. p. 82. 
— Pfr . in Chemn. ed. II. Helicinac. p. 9. 
— Petit in Journ. Conch. 1851. I. p. 85. 
Helicinac spec. Gray et Auctt. 
Helicis spec. Fer . , Wood, Desh . 
Species unica : 
1 . L, aureola (Helix) Ferui^ac. 563 
T. depresso - conoidea , tenuiuscula, concentrice confertim 
striata, purpurascenti - fusca vel straminea, yix nitidula; spira 
conoidea, acuta; anfr. fere 6 planiusculi, ultimus medio sub- 
angulatus (angulo interdum minute tuberculifero), basi planius- 
culus , medio impressus , antice constrictus , biscrobiculatus ; 
apertura perobliqua , bisinuato - subtriangularis ; columella bre- 
yissima, immediate in peristoma bidentatum, album, superne 
late expansum, basi reflexum abiens. — Operc. tenuissimum, 
extus concaviusculum , pallide corneo -luteum. — Diam. maj. 
8 1 / 2 , min. 7'/ 3 , alt. 5V 2 mill. (Coll. Nr. 18.) 
Helix aureola (Helicodonta) Fer. Prodr. N. 90. 
— — Fer. Hist. t. 48. f. 1. t. 49 A. f. 1. 
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