1869.] CLASSIFICATION OF THE HELICTERIN &. 651 
Sec. 2. 
Leves aut tenuiter striate. 
Leptachatina antiqua (Pse.). Leptachatina gracilis (Ptr.). 
brevicula (Pse.). ‘  -——— levis (Pse.). 
—— cerealis (Gld.). —— nitida (Newc.). 
cornea (Newe.). obclavata (Pfr.). 
cingula (Migh.). obtusa (Pfr.). 
compacta (Pse.). — pyramis (Pfr.). 
exilis (Gul.). —— resinula (Gul.). 
extincta (Ptr.). —— simplex (Pse.). 
grana (Newe.). teres (Pfr.). 
—— guttula (Gld.). 
Costulose. 
—— balteata (Pse.). —- margarita (Ptr.). 
costulosa (Pse.). oryza (Pfr.). 
—— dimidiata (Ptr.). —— striatula (Gld.). 
- extensa (Pse.). — semicostata (Ptr.). 
Susca (Newe.). —— tenuicostata (Pse.). 
—- fuscula (Gul.). terebralis (Gul.). 
glutinosa (Ptr.). tenebrosa (Pse.). 
All the species of this genus are small, thin, and those of the type 
without columellar fold. They are widely distributed, being found 
on all parts of the several islands. There are a number of species 
which agree with the type in their general characters, but are usually 
thicker, and have a columellar fold more or less developed, and more 
elongate in shape. ‘They unite with species of the genus Ladiella. 
Genus 13. Lasrexya (Pfr.). 
Labiella, Pfeiff. Mon. Blatt. 1854, p. 142; Mon. Hel. Viv. 1859, 
vol. iv. p. 530. 
T. oblonga, solida ; plica columellari torta; perist. obtuso, labiato, 
margine dextro incrassato. 
Labiella callosa (Pfr.). Labiella pachystoma (Pse.). 
labiata (Newe.). 
Sec. 2. 
—- corneola (Pfr.). succincta (Newe.). 
— crassilabrum (Newc.). — subrostrata (Pfr.). 
—— ellipsoidea (Gld.). turgidula (Pse.). 
alholabris (Newe.). vitrea (Newe.). 
—— fumosa (Newe.). 
This genus was founded by Dr. Pfeiffer on two species, of which 
the outer lip is unusually thickened. 
Mature specimens of these species not more thickened than seve- 
ral other species closely allied to them in their other characters, are 
common. I have censequently added several to this genus. They 
approach through their varieties certain species of Leptachatina. 
Both this and the previous genus will require revision as more 
specimens and species are collected. 
