JANTHINIDA. ii 
J. communis, Zamark, Anim. Sans. Vert., ix., p. 43; Reeve, 
Conch. Ic., f- 5; Chenu, f. 517 (bad,) 518; Heltx zanthina, L. Whorls 
four, convex, finely obliquely striated; spire depressed ; mouth large ; 
columella rather short, twisted to the right; violet, getting whitish 
on the spire. 
Length, ‘65 ; breadth, ‘82 ; angle of spire, 107°. 
North Isiand. N.S. Wales. 
J. iricolor, Reeve, Conch. Lc., f- 23. Shell somewhat globose, 
very thin; spire obtusely conical, more or less immersed ; whorls rather 
narrow, rounded concentrically irregularly plicately striated ;_ striz 
sinuated in the middle, purple violet, transparently iridescent ; colu- 
mella scarcely reflected, rather twisted ; aperture open, slightly channel- 
led at the base (Reeve.) 
North Island. 
J. exigua, Lamark, Anim. Sans. Vert.,ix., p 5; Reeve, Conch. Ic., 
jf. 21; Chenu, f- 519. Whorls four, convex, rather deeply obliquely 
striated ; mouth large; columella straight, long; outer lip deeply 
notched ; violet, with a whitish spiral band on the posterior margin of 
the whorls. 
Length, ‘4; breadth, -4; angle of spire, 85°. 
Abundant on exposed sandy coasts. 
North and South Islands. Chatham Islands. N.S. Wales and 
S. Australia. 
Sub-Section— Tenioglossa. 
One row of rachis plates, and three lateral plates on each side (3. 1.3.) 
SERIES—PROBOSCIDIFERA. 
Head small; proboscis retractile under the base of the tentacles. 
FAMILY—NATICID/:. 
Animal bulky. Radula short. Tentacles lanceolate, wide apart, 
united by a veil; eyes usually absent, or very minute, and placed beneath 
the tentacular veil. Mantle enclosed. Foot very large and expanded, 
rounded at both ends, much produced in front, where it is furnished with 
a fold which covers the head and tentacles ; operculigerous lobe very 
ample, reflected upon and partially concealing the sides and back of the 
shell. Operculum spiral, few whorled. Shell spiral, usually smooth or 
polished, more or less globular; aperture semi-lunar, sometimes very 
large. 
Genus, NATICA—Adanson. 
Animal entirely retractile within the shell. Operculum horny, with 
a calcareous outer layer. Shelli sub-globose ; spire rather elevated ; 
columella adherent to, and spirally contorted in, the umbilicus. 
N. zealandica, Quoy, Voy. Astrolabe, ii., p. 237, pl, 66, f. 11-12; 
Reeve, Conch. Ic., f. 90. Shell smooth, perforate, pillar visible in the 
