402 
Shell large, much inflated, suboval, rather thin, composed of five convex whirls, 
prominently sliouldered at the upper pari; epidermis of an obscure olivaceous green color; 
lines of accretion very fine and compact; transverse lines obscure, appearing serriform 
under a magnifier, giving the surface the appareance of very delicate lace work; suture 
deep, and in one specimen subcanaliculate ; spire short and pointed •when present; aperture 
oblong, very wide at the posterior part, but narrowing rapidly anteriorly and occupying 
rather more than two-thirds the length of the shell ; labrum thin and somewhat reflected ; 
labium broadly reflected, forming and partially covering an open and very deep umbilicus ; 
columella fold very prominent; within it is of a ligt yellowish fawn color, vsrith an obscure 
purplish Zone, one line in breadth, and about two lines vt'ithin the aperture. 
Lg. 1,3, br. 1." 
Second Eagle Lake, Maine. 
Bemerkung: Die Ard collidirl mif der europäischen L. ampla. 
139» Limnaeiis imperialis Lea. 
Limnaea imperialis, Lea, Trans. Amer. Phil. soc. V 1837 p. 81 t. 9 f. 73. 
T. ovato-ventricosa, pellucida, tenuissima, albido-cornea, subcoronata, apice obtuso ; 
anfr. 4, inflatis, ultimo maximo; apertura magna, ovata, labro valde extenso. Lea. 
Lg. 1,4", diam. 0,9". 
Palria: ? 
140. Limnaeus tasmanicus Tenn. Woods. 
Limnaea tasmanica Tenn. Wds. Proc. Royal, soc. Tasm. 1875 p. 70. 
— — Petterd Journ. Conch. II p. 81. 
T. tenui, pellucida, eleganter pyramidata, corneo-fulva; spira elevata, acuminata; 
apertura longitudine paulo superanti ; anfr. 5 — 8, obliquis; ultimo anfracto inflato ; apertura 
late ovata; labio externo tenuissimo, fragilis; labio interno subexpanso, plica inconspicua, 
columella alba, vix contorta. 
Lg. 25 mm., lat. 12 mm., apt. lg. 15 mm. 
Palria : Tasniania. 
