GASTEROPODA. 127 
anfractibus quinque convexiusculis, ultimo vix angulato; suturd im- 
pressa: apertura ovata ; peristomate continuo, obtuso, rufo. 
SHELL minute, elongate, ovate-turreted, rather solid, of a Spanish- 
brown colour; spire of five or more whorls, forming an acute spire, 
eroded at tip, whorls moderately convex, shouldered above, the last in- 
distinctly angular at periphery, imperforate; aperture one-third the 
length of the shell; peristome complete, edge black, thick; opercle 
sub-circular, eccentric ; surface smooth. 
Length one-fifth of an inch; breadth one-twelfth of an inch. 
Obtained at Tipoona, Banks’ Peninsula, New Zealand. Common 
in streams among plants. Pzckering. 
A small elongated species, like Paludina Pretssii, of New Holland, 
or more like Valwata pupoidea in size, shape, and colour; but the 
opercle is that of Amnicola. Its colour, and dark, obtuse peristome, 
give rather prominent characters to a shell so small and so destitute of 
other marks. 
Figures 150, 150 a, two views of the shell, magnified ; 150 4, natural 
size. 
AMNICOLA GRACILIS (Gould). 
Testa minuta, elongato-turrita, tenuis, subperforata, epidermide virides- 
cente nitida: spira acuta, anfractibus quinque convexis ; sutura pro- 
Sunda ; apertura ovata ; peristomate continuo, labro acuto, subevaso. 
SHELL minute, elongate, turreted, delicate, smooth, or with faint 
strie of growth, covered with a thin, pale green epidermis: spire 
acute, whorls five, convex, the last one half the length of the shell, and 
partially perforate; aperture ovate, one-third the length of the shell; 
peristome entire, acute, rising before an indistinct umbilical chink, 
one-third the length of the shell, somewhat evasive. 
Length of axis one-fifth of an inch; breadth one-tenth of an inch. 
