GASTEROPODA. 21 
. Figure 28, the aperture ; 28 a, profile of the shell; 28 4, the animal 
bearing the shell. 
Succtnea VEsIcaLis (Gould). 
Testa tenuissima, fragilis, lucida, late ovata, depressa, gradibus atatis 
undulata, epidermide straminea induta: spira anfractibus tribus, 
ultimo magno, patulo, ceteris spiram parvam formantibus : apertura 
sul-ovalis, ad basim late rotundata, longitudinis 4 equans ;, plica 
columellart conspicua. 
Succinea vesicalis, GouuLp; Proceed. Boston Soc. Nat. Hist., 1. 183. 
Nov. 1846. Expedition Shells, 28. 
SHELL broad ovate, very thin and fragile, shining, undulated by the 
stages of growth, covered with a straw-coloured epidermis. Whorls 
three, the two upper ones forming a minute, reflexed spire; suture 
moderately impressed ; body of the shell beneath pretty large and 
rounded. Aperture very large, broad ovate, very broadly rounded at 
base, lip not reverting on the left side; fold of the columella well- 
marked ; interior shining and silvery. 
Length of axis three-fifths of an inch; greatest breadth three- 
eighths, lesser breadth two-eighths of an inch. 
Found by Mr. Couthouy, on Mauna Kea, at an elevation of 7000 
feet, Hawaii, Sandwich Islands. 
In shape it is much like S. rubescens, except that the columellar 
portion is more fully arched anteriorly. 
Figure 17, view of the aperture; 17 a, profile view of the shell. 
SuUCCINEA PUDURINA (Gould). 
Testa elongata, ovato-turrita, tenuis, lucida, strits conspicuis longitudi- 
nalibus notata, succineo-rubescens: spira elevata, anfractibus tribus 
cylindracets valde obliquis et sutura profundda discretis compositu. 
6 
