XXV 
fuscous, double; the internal one continuous, the external narrowed at 
the penultimate whorl, in other respects, opened, slightly reflexed. 
Length, 7 ; diam., 3J. Aperture, length, 2] mill. 
Hab., Drury, Taupiri, New Zealand (Hochstetter). 
IIydkockxa, Parreyss. 
Operculum horny, few-whorled. Shell imperforate, or umbilicated, 
globosely turbinated, ovate or turreted ; aperture oval or semi-circular; 
peristome simple, straight, or expanded, margins disconnected, columellar 
margin sub-callous.—Pfeiffer. 
HYDROCENA PURCHASI, Pfeiffer. 
Hydrocena Furchasi, Pfr,, P.Z.S., 1861, p. 150; M. Pn. V., Suppl. 2, 
p. 172, No. 13. 
Shell sub-perforated, turriculated, somewhat smooth, translucid, horny- 
fuscous ; spire conical, rather obtuse ; whorls 5, convex, the last slightly 
exceeding one-third of the entire length of shell; aperture a little 
oblique, sub-circular ; peristome simple, straight, very shortly interrupted 
at the contiguous whorl, loft margin slightly reflexed. 
Length, 2 ; diam., 1 mill. 
Hab., Bay of Islands, New Zealand (Purchas, Hochstetter). 
Omphalotropis, Pfeiffer. 
Operculum thin, horny, few-whorled. Shell perforated, or narrowly 
umbilicated, turreted, or globosely-turbinated, keeled around the 
perforation; aperture oval ; peristome disconnected, straight or ex¬ 
panded . —Pfeiffer. 
OMPHALOTROPIS YESTITA, Pfeiffer. 
Hydrocena vestita, Pfr., P.Z.S., 1855, p. 106 ; M. Pn. Y., Suppl. 1, 
p. 166. Omphalotropis vestita, Pfr., M. Pn. Y., Suppl. 2, p. 179, 
No. 30. 
Shell perforated, oblongly-conical, thin, striated and spirally closely 
ridged, covered with a somewhat fuscous epidermis ; spire pyramidical, 
rather acute; whorls 6, flat, the last armed below the middle with an 
acute keel, and about the perforation with a second ; aperture hardly 
oblique, sub-angularly oval; peristome simple, straight, margins con¬ 
verging. Operculum fuscous. 
Length, 5 ; diam., 3. Aperture, length, 2 mill. 
Hab., New Zealand. 
