32 AURICULID. 
aperture crescentic or transversely oval ; peristome thin, incomplete, 
the upper margin produced. 
P. corinna, Gray; P.ZS., 1849, p. 167; Reeve, Conch, Lc., 
f. 122. Shell depressed, white, above flat, beneath rather concave ; 
whorls convex rounded. Like /. adbus of Europe, but not spirally 
striated (Gray.) 
Auckland. Lake Wakatipu. 
FAMILY—AURICULID#. 
Radula broad and long; teeth numerous, in slightly bent cross 
series ; central tooth narrow, tricuspid, laterals diminishing outwards. 
Head ending in a snout ; mouth with a horny upper jaw, and with two 
dilated buccal lobes, united above, separate below; tentacles sub- 
cylindrical, contractile; eyes sessile at the inner sides of their bases. 
Mantle closed, with a thickened margin; respiratory orifice posterior, 
on the right side. Sexes united. Shell spiral, covered with a horny 
epidermis ; aperture elongate, with strong folds on the inner lip ; outer 
lip often dentate. No operculum. Animal lacrustine, usually fre- 
quenting salt marshes. 
Sub-Genus—-Melampine. 
Amphibious, or living in brackish water. Tentacles developed ; 
eyes at their inner bases. Shell with the inner lip plicate; outer 
straight and acute. 
Genus, MELAMPUS— Montfort. 
Foot bifid, posteriorly. Shell ovate-conoidal, solid, spire rather 
short ; aperture elongated, narrow ; columella distinctly plaited ; body 
of last whorl smooth, or furnished with from one to five folds or teeth ; 
peristome straight; right margin acute, furnished with transverse 
ridges. * 
Australia. Indian Archipelago. Philippines. Ceylon. Mauritius. 
South Africa. Madeira. West Indies. North and South America. 
Polynesia. 
M. commodus, Adams; Proc. Zool. Soc., 1854, p. 12; Pfeiffer, 
Cat. Auric. Brit. Mus., p. 10. Shell rimate, oblong-ovate, rather solid, 
slightly shining ; chestnut ; spire conic, apex pointed ; suture bordered ; 
whorls 9, flat, the upper radiately ribbed, the last forming nearly two- 
thirds of the total length, rather smooth, somewhat turgid above, 
attenuated at its base; slightly gibbous and striated ; aperture nearly 
perpendicular, acuminately semi-ovate ; no plait on penultimate whorl ; 
columella plait short, oblique, somewhat twisted, forming an indistinct 
angle with the peristome, which is simple, straight,; right margin 
scarcely arcuate, slightly sinuate, furnished within with three transverse 
ridges ; columella margin callous, shining. 
* Pfeiffer gives New Zealand as the habitat of Melampus sulcatus Adams ; 
but Adams gives no locality ; Cox gives it from Port Jackson. 
