TURRITELLIDA. 83 
margin sharp, close to the columella, so that the visible umbilicus is 
reduced to a fissure ; keel sometimes with a brown margin, and some- 
times irregularly granulated. 
Length, ‘15 ; breadth, ‘o8. (Frauenfeld.) 
Probably the same as the last. I have a specimen from Auckland. 
Genus, POTAMOPYRGUS—Stimpson. 
Shell ornamented with spines ; rhachidian tooth not strongly trilo- 
bate below ; basal denticles of each tooth minute and close to the 
lateral margins ; denticles of intermediate tooth numerous and equal in 
size. 
P. corolla, Gould, U.S., Ex., Ep., xii, p. 129, f 149; Reeve, 
Conch. Ic. (Melania,) f. 366 ; Paludestrina cumingiana and P. salleana ; 
Fischer, Jour de Conch., viii., ~. 208-209 ; Hl. crosset, Frauenfeld, Lc., 
p- 595, A. ciliata (Gould,) Frauenfeld, l.c., p. 1025. Shell ovate, thin, 
transparent, pale oliye ; whorls 5 to 6, broadly angled round the upper 
part, spined at the angle ; aperture somewhat squarely ovate (Reeve.) 
Common in the North Island. 
P. Cumingiana is said, by its author, to be distinguished by its glo- 
bular ventricose form ; absence of spines on the first 34 whorls, their 
greater number (17-20) on the last whorl; their length and obliquity 
(curving toward the spire ;) the obsolete keel on the last whorl corres- 
ponding to the spines ; and the peristome being slightly thickened and 
entire. . sad/eana is more conical, less globular, shorter spines, and, on 
the last four whorls, keels lirate but below the spines ; the last whorl is 
proportionately less swollen. (Tenison-Woods.) 
FAMILY—TURRITELLID. 
Radula minute, very short; teeth in seven series (3. 1. 3.,) each 
series consisting of a sub-quadrate median tooth, with an incurved, den- 
ticulated apex, and of three similar ligulate uncini on each side, all with 
hamate, serrulated summits. Rostrum short, broad ; tentacles long and 
subulate ; the eyes slightly prominent on their external bases; mantle 
with a fringed margin, obscurely siphonated at the right side ; branchial 
piume single, very long; foot very short, truncate in front, rounded 
behind, grooved beneath; operculigerous lobe simple; operculum 
horny, circular, multi-spiral; edge of the whorls fimbriated. Shell 
spiral, many whorled ; aperture simple in front. 
Genus, TURRITELLA—Lamark. 
(Sub-Genus, Haustator.) Aperture sub-quadrangular ; whorls with a 
broad groove in the middle ; outer lip sinuated. 
T. rosea, Quwoy, Z.c., ili., p. 136, Al. 55, 7 24-26; Reeve, Conch. Lc., 
jf. 41. Whorls flattened, spirally striated, the ribs of unequal sizes, 
