STENOPID&. 23 
what convex, scarcely elevated ; whorls 3%, convex, rapidly increasing, 
the last not descending, depressed, flattish beneath, impressed in the 
middle; aperture diagonal, rotundly-oval; peristome simple, straight, 
columellar margin arcuated, ascending. 
Diam., greatest, °28; least, ‘24; height, ‘14. (Pfr.) 
New Zealand. 
b. Umbilicus narrow. 
P. glabriuscula, Pfeffer; P-Z.S., 1851; ILAV., vol. 3, p. 51; 
vol. 5, p. 71, Wo. 193; Reeve, f- 822. Shell perforate, conoidly-semi- 
globose, thin, smooth, pellucid, shining, pale yellow, angularly lined 
with rufous ; spire convexly-conoidal, slightly acute ; whorls 5%, slightly 
convex, the last not descending, flattish beneath ; aperture oblique, sub- 
depressed, lunar; peristome simple, straight, columellar margin bent 
downwards, slightly reflexed above. 
Diam., greatest, ‘14; least, ‘12; height, 08. (Pfr.) 
New Zealand (Strange.) 
Pepsilon, Leger: P:ZS. 1851; A77.V., vol. 3,°p. 975 tol. 
5, 2: 153, Wo. 763; HZ. caput spinule ; Reeve, f. 818. Shell umbilicated, 
depressed, thin, obliquely and closely plaited above, pale horny ; spire 
rather convex; whorls 3%, rather convex, the last not descending, 
somewhat smooth at the base ; umbilicus narrow, pervious; aperture a 
little oblique, rotundately-lunar ; peristome simple, straight, margins 
converging. 
Diam., greatest, ‘07; least, 06; height, ‘oz. (Pfr.) 
New Zealand. 
P. chiron, Gray ;-P.ZS,. 1849, p. 166; Helix chiron, Pfr., 
MTT 000; 35 Pp: 94 se Hol. 15,.ps 052,10. 7425 Reeve, for7g7 ‘shell 
umbilicated, depressed, arcuately and rather distantly plaited, covered 
with a shining, fuscous-olive epidermis; spire rather convex; whorls 
3%, rather convex, the last sub-depressed, rounded at the margin, 
convex at the base; umbilicus narrow, pervious; aperture a little 
oblique, sub-lunately-rotund; peristome thin, the right margin some- 
what bent backwards, separated from the last whorl by a slight incision, 
columellar margin above rather widely-opened out. 
Diam., greatest, ‘24; least, ‘2; height, ‘12, (Pfr.) 
Auckland (Greenwood. ) 
The upper surface resembles a minature P. dusbyz, but the under 
surface is very different. “ 
P. rapida, Pfeffer; Zetschr. f. Malak, 1353, p. 54, ILAV., vol. 
3, p. 633; vol. 5, p. 175, Wo. 935; Reeve, f’ 1038. Shell unbilicated, 
depressed, discoidal, thin, under the lens spirally striatulated, shining, 
pellucid, chestnut, variegated with luteous streaks and dots ; spire flat, 
sub-immersed ; suture sub-caniculated; whorls 3%, rather convex, 
rapidly increasing, the last broad, depressed, rounded at the periphery, 
not descending anteriorly, a little convex at the base, gradually ascend- 
ing into a moderate umbilicus; aperture a little oblique, lunately- 
