GASTEROPODA. 17 
Longest diameter or axis one-half an inch, shorter diameter seven- 
twentieths of an inch; height one-fifth of an inch. 
Found on the island of Hawaii, Sandwich Islands, by Dr. Picke- 
ring and Mr. Drayton. 
Like S. rotundata, it is depressed in form, and nearly destitute of 
an obvious spire; but it is larger, more transparent, is marked with 
revolving furrows, is rather oblong than circular, and the peculiar 
sweep of the lip gives the aperture a somewhat auricular form, poste- 
riorly. 
Figure 15, the aperture, and 15 a, the profile of the shell, magnified ; 
15 6, natural size. 
Succinea LumBatis (Gould). 
Testa mediocris, ovato-conica, tenuissima, sublucida, pallidé virens, levi- 
ter striata, subtus gibbosa: spira acuté conica ; anfractibus tribus con- 
vexiusculis, ultimo ventricoso, versus suturam dechivi: apertura rotun- 
dato-ovata ; columellé valdé arcuata, callo induta ; plica medtocrt. 
Succinea lumbalis, Goutp ; Proceed. Boston Soc. Nat. Hist., 11. 183. 
Nov. 1846. Expedition Shells, 28. 
SHELL of moderate size, conic-ovate, thin and fragile, faintly trans- 
parent, without lustre, of a dull, light yellowish-green colour, and 
marked with fine, obtuse lines of growth. Spire well developed, apex 
acute, whorls three or more, those of the spire slightly convex, and 
separated by a merely linear suture; the last whorl inflated, most so 
anteriorly, and sloping to the suture behind the middle, so as to give 
the upper part of the shell a regularly conical form. Body beneath 
tumid and large, with a slight columellar fold; columella roundly 
arched. Aperture rounded ovate, not three-fourths the length of the 
shell. 
Length of axis nine-twentieths of an inch; greatest breadth one- 
fourth of an inch, lesser transverse diameter one-fifth of an inch. 
5 
