GASTEROPODA. 13 
SuccingEa EXPLANATA (Gould). 
Testa parva, tenuis, scutelleformis, rotundato-elliptica, pené evoluta, 
concentricé striata, luteo-cornea: spira marginals, feré nulla, ommino 
aperta ; columella arcuata. 
SHELL small, thin, of a rounded elliptical outline, and of a shallow, 
saucer-shaped or shield-like form. The surface is concentrically 
striated, and covered by a yellowish-green epidermis. The spire is 
marginal, at one end of the ellipse, and makes only a part of one 
volution. The columellar margin of the aperture sweeps round in a 
gentle spiral, and terminates a little within the margin of the outer 
lip, thus forming a small umbonal cavity. 
Longest diameter one-fourth of an inch; shorter diameter one-fifth 
of an inch. 
Found by Mr. Couthouy, at the island of Kauai, Sandwich Islands. 
Mr. Couthouy has labelled the shell “'Testacella,” but has given no 
account of the animal. As the formation of the spire does not corre- 
spond with that genus, and as it seems to be only the extreme modi- 
fication of a group peculiar to the Sandwich Islands, of which the 
three following species are members, I have placed it with them, in 
the genus Succinea. There is also a Succinea from Guadaloupe of 
the same model, though considerably more convolute. 
Figure 31, 31 a, 31 6, three views of the shell, enlarged; 31 c, 
natural size. 
SuccinEa PUTAMEN (Gould). 
Testa magna, depressa, globoso-elliptica, tenuis, levis, striis incremen- 
talibus et striis volventibus tenuiter decussata, fulvo-cornea, ad peri- 
pheriam sub-angulata: spira feré nulla, anfractibus viz duobus ; 
sutura lineari: apertura paginam inferiorem feré adequans, rotun- 
dato-ovalis ; margine columellari sub-plicato. 
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