246 CATALOGUE OF PHANEROPNEUMONA. 
with the right margin sinuate; basal margin with a single 
tooth near the columella; basal callus very thin. Height 2, 
greatest breadth 4, least br. 35 mill. 
Helicina rugosa, Pfr. in Wiegm. Arch. f. Nat. 1839, i. p. 355; Sow. 
Thes. n. 72, p. 14, t. 3, f. 182; Gould, in Bost. Journ. iv. 4, p. 493 ; 
Pfr. Ic. u. 4, p. 13, t. 4, f. 28-80; Pnewm. Mon. p. 341. 
Hab. Cuba. 
5. HELICINA UNIDENTATA. 
Shell depressed, rather thin, diaphanous, slightly shining, reddish, 
sculptured with strong blunt spiral ridges alternating with 
smaller ones; spire scarcely raised; whorls 43, depressed, last 
descending anteriorly, deeply concave beneath in the centre; 
aperture very oblique, broadly lunate; columella simple, dilated 
backwards into a whitish circumscript callus; peristome ex- 
panded, with a white internal lip; basal margin furnished with 
a large prominent tooth near the columella. Height 23, great- 
est breadth 5, least br. 4 mill. 
Helicina unidentata, Pfr. in Proc. Z. S. 1848, p. 125; Jc. n. 5, 
p. 14, t. 9, f£. 14-17; Pnewm. Mon. p. 341. 
8. With the tooth of the peristome less developed. 
Helieina rusticella, Morelet, Testac. Noviss. i. p. 21, f. 51. 
Hab, Honduras (Dyson); var. 8. from the Island of Carmen 
(Morelet). 
6. HELICINA LIRATA. 
Shell orbiculate-conoidal, thin, sculptured with close-set, sharp, 
concentric ridges, diaphanous, whitish ; spire conoidal, pointed ; 
whorls 44-5, very little convex, last keeled, impressed on the 
centre of its lower side; aperture oblique, roundish, rather 
triangular; columella very short, simple, dilated into an ex- 
tremely thin callus; peristome shortly expanded; basal margin 
having a single indistinct tooth on the middle. Height 2}, 
greatest breadth 4, least br. 3; mill. 
Helicina lirata, Pfr. in Z. f. IM. 1847, p. 150; Jc. n. 6, p. 14, t. 4, 
f. 40-43; Pneum. Mon. p. 341. 
Hab. Mexico, Yucatan (Hegewisch). 
7. HELICINA LINEATA. 
Shell depressed, thin, sculptured with rather crowded concentric 
raised lines, slightly keeled by a single peripherical ridge, pel- 
lucid, fulvous; spire rather conoidally depressed, with the apex 
blunt; whorls 42, moderately convex, the last one impressed 
beneath in the centre, covered with a thin callus; aperture very 
