GASTEROPODA. 25 
Situated at the right posterior third of the collar, which is very 
thick and fleshy. 
SHELL small, thin, delicate, and somewhat flexible, of a short, ovate 
form, and a bright leaf-green colour. The lines of increment are con- 
spicuous, somewhat irregular, and sometimes there are distant, inter- 
rupted, revolving strie. Whorls three, very convex, and separated by 
a deep suture, the two upper ones forming a short, acute spire; the 
last ample, ventricose. Aperture ovate, rather acute posteriorly ; the 
columellar margin slightly reflected, and the extremities of the lip 
united across the penultimate whorl by a thin callus. 
Length of axis one-third of an inch; breadth two-ninths of an inch. 
[a Pc.]] 
Found by Mr. Couthouy, at Tierra del Fuego, who states that it is 
abundant in moist places around Orange Harbour. 
It is a small, remarkably short and ventricose species, conspicuous 
also for its deep green colour. Some specimens are much more elon- 
gated than others. It is interesting from its habitat, and is the only 
antarctic species yet known. 
Figure 22, front, and 22 a, profile of the shell, enlarged; 22 b, the 
animal crawling with the shell, also enlarged ; 22 c, natural size. 
SuccinEa MaNuANA (Gould). 
Testa parva, ovata, ventricosa, tenuis, sub-opaca, straminea, longitudr- 
naliter striata et transverse sparsim rugosa: spira obtusa, exserta, 
anfractibus duobus cum dimidio, ventricosis, sutura profunda discretis : 
apertura ovato-rotundata, peristomate ad columellam minime reflexo ; 
regione umbilical depressa, sinuosd. 
Succinea Manuana, Govutp; Proceed. Boston Soc. Nat. Hist., i. 
185. Dec. 1846. Expedition Shells, 29.  Preirrer; Monog. ii. 520. 
SHELL small, thin, ovate, rather opaque, pale straw-coloured, faintly 
tinged with roseate, strie of increment rather coarse, with a few trans- 
7 
