18 MOLLUSCA. 
Obtained on Mauna Kea, Hawaii, and also on the island of Kauai, 
Sandwich Islands, by Mr. Couthouy. 
Its dull aspect, conical spire, and ventricose form are its distinctive 
marks. It resembles small specimens of Limnea catascopium, Say. 
Figure 18, the front, and 18 a, the profile view of the shell, enlarged ; 
18 6, natural size. 
SuccInea HUMEROSA (Gould). 
Testa ovata, depressa, sub-rhombea, sublucida, striis incrementahibus ru- 
gosa, sulcis raris volventibus interdum arata, dilute virens, et interdum 
rubricans: spira anfractibus tribus, ultimo permagno, postice sub-an- 
gulato: apertura sub-ovalts, postice amplificata ; labro dextrorsum de- 
currente ; plica columellart conspicua. 
Succinea humerosa, Goutn ; Proceed. Boston Soc. Nat. Hist., i. 183. 
Nov. 1846. Expedition Shells, 28. 
Animat corpulent, drab-coloured, thickly dotted with dusky and 
rose-red, and with a roseate edge ; a dusky line passes back from each 
tentacle ; the surface is finely reticulated, and there are some indistinct 
radiating lines. 
Suet rather large, compressed, broad-ovate or somewhat rhomboi- 
dal; surface rather coarsely wrinkled by the lines of increment, and 
usually with one or more indented revolving furrows, looking like de- 
fects in the shell. Colour pale dead green, sometimes tinged reddish. 
Spire well developed, somewhat reflexed, composed of three whorls, 
distinctly defined by a suture, the last one large, and having an indis- 
tinct angle at its posterior fourth, so as to form a shoulder which is 
quite conspicuous as it approaches the outer lip. Aperture large, 
nearly oval, rounded posteriorly, and having the lip reflected down 
the body of the shell, and also a decided flexure at the right margin, 
corresponding to the angle of the whorl; columella with a distinct 
fold. 
