116 MOLLUSCA. 
scribed. It closely resembles very small specimens of P. heterostropha, 
Say, though its form and texture is more like P. fontinalis, which, how- 
ever, has a much shorter spire. 
Figures 134, 134a, two views of the animal and shell enlarged ; 
1344, shell of the natural size. 
Puysa TAbuLaTa (Gould). 
Testa ovata, sub-solida, impolitu, fuliginesa: spira anfractibus quatuor 
ad quinque ventricosis, superne angulate-carinatis, late tabulatis : 
apertura elliptica, dimidiam teste lngitudinis superans: columella 
albidd, viz plicata ; fuuce fusco-castuned. 
Physa tabulata, Gounp; Proceed. Boston Soc. Nat. Hist., 11. 214. 
June 1847. Expedition Shells, 42. 
ANIMAL olive green, paler at edves, tentacles long and slender, eyes 
on prominent basal tubercles; mantle slightly fringed. 
SHELL ovate, strong, nearly opaque, the exterior rather coarsely 
striated, and the surface of a dead, dusky brown colour, owing in part 
to the adhesion of dark earthy particles. _Whorls four or five, ventri- 
cose, with a sharp, decided, carinated angle at some distance from 
the suture, so as to produce a very strongly marked scaffolding, and 
giving the shell a remarkably angular aspect. Aperture rounded, 
nearly oval, more than half the length of the shell, modified by the 
penultimate whorl, where it is covered by a thin callus. Columella 
whitish, rounded, nearly destitute of any fold; cavity of the shell very 
dark chestnut brown. 
Length seven-tenths of an inch ; diameter four-tenths of an inch. 
Found in a mountain stream, Bay of Islands, New Zealand. Dray- 
ton. 
Not to be mistaken for any other species. It is very much more 
angular than P. ancillaria, Say, and the keel upon the angle, when 
closely examined, is found to be minutely crenulated. It is very varia- 
