d 
324 New Fresh- Water Shells. 
ed above by the intrusion of the body-whorl, regular- 
ly but narrowly rounded below ; labrum sharp, 
prominent, with a short, abrupt curve above, then 
straight to the middle, arched in the lower half ; col- 
umella with an obtuse fold ; labium moderately re- 
flected below ; umbilicus small, partly covered by 
the ada labium. : | 
Length, .16 inch ; breadth, .095 inch: of a large 
specimen, length, .18 inch ; breadth, .1 inch. 
Cabinets of the Bost. Soc. of Nat. Hist. ; of Mr. C. 
F. Shiverick ; and my own. * 
Station iid habitat ; the same with Pleurotoma 
plicata. 
Remarks. In 1838 I found two elec after à 
violent storm, on the shore at New Bedford. Three 
specimens were found with the preceding species, 
and several have been obtained by Mr. Shiverick. 
LIMNEA PALLIDA. 
Plate III. Fig. 13. 
L. testà itcr pallida ; anfractibus quinque; suturà im- 
pressà ; spirà conicA, subacuta ; anfractü postremo producto ; apertura 
superné acuta, e id ambition parvo. 
Shell moderately elongate, ovate-fusiform, very 
pale horn color, semi-transparent, not very thin, with 
fine, irregular: strie of growth, without revolving 
stria ; whorls about five and a half, moderately con- 
vex; suture well impressed ; spire four-ninths of the 
length of the shell, acutely conic, its opposite sides 
containing an angle of about 45°, sub-acute at tip; 
body-whorl not much enlarged, somewhat produced 
below ; aperture five-ninths of the length of the 
