128 MOLLUSCA. 
Found on plants in fresh-water streams, Banks’ Peninsula, New 
Zealand. Pickering. 
More slender, and less solid, than A. badia, as well as of an entirely 
different colour. Itis very like Paludina acuta of Europe. 
Figures 151, 151 a, two views of the shell, enlarged; 151 b, outline 
of the shell, natural size. 
AMPULLARIA COLUMELLARIS. 
Testa ponderosa, imperforata, rhomboidali-ovalis, nitida, sed sub lente 
argute reticulata, flavo-viridis et fasciis rubidis cincta: spira pro- 
ducta, anfractibus septem ventricosis: apertura semilunarts, trientes 
duos longitudinis teste haud equans ; columella rectd, elongata, cy- 
lindracea, contorta ; labro flavido, evaso ; fauce rufo-olivaced. 
Suexi solid, rhomboidal oval, ventricose, imperforate, apparently 
smooth and shining, but when examined by a magnifier, it is found to 
be minutely reticulated with revolving lines; pale yellowish-green 
encircled with narrow reddish-brown bands, arranged somewhat in 
pairs: whorls seven, rounded, ventricose, a little shouldered at the 
sutures; spire produced; aperture less than two-thirds the length of 
the shell, semilunar; columella long, solid, rounded, with much callus 
above, and rolling outwards at base, which is produced and narrow 
anteriorly, somewhat effuse, both above and below; callus and mar- 
gin of lip yellowish; interior wine-colour; lip campanulate, a little 
everted. 
Length of the axis two and a half inches ; diameter two inches. 
Inhabits the Province of Maynas, Peru. Couthouy. 
Remarkable for its elongated form, its solidity, its want of umbili- 
cus, and the presence of a columella like the bulimoid helices, instead 
of the usual circular base. 
Figures 147, 147 a, two views of the shell. 
