9 
cularly joined to the outer lip at the base. Outer lip reflected 
back upon the whorl, and incorporated with it near the base, with 
a deep sinus in the middle. Beneath, one quarter of an inch. 
Lister, Tab. 93, f. 04 ? 
Inhabits moist places ; common* In the collection of the Aca- 
demy, This species appears to be somev/hat allied to S. hispida^ 
but is sufficiently distinct. Found by Mr. Lardner Vanuxem. 
H. PERSPECTIVA, — ^Shell very mucli depressed, with about six 
whorls ; whorls striated across, with raised, parallel, acute lines, 
forming strongly impressed sulcse between them. Umbilicus very 
large, resembling an inverted spire, in diameter at least equal to 
the breadth of the body whorl, and exhibiting distinctly all the 
volutions. Diameter three quarters of an inch. Found by Mr, 
Lesueur near Lake Erie. 
H. EiNEATA. — Shell very much depressed, somewhat discoidah 
Whorls about four, each longer than broad, with numerous raised, 
parallel, equidistant, regular, revolving lines. Suture impressed. 
Umbilicus very large, diameter at least equal to the breadth of 
the body-whorl, and exhibiting all the volutions distinctly. Aper- 
ture longer than wide, lunate. Diameter three-twentieths of an 
inch, nearly. 
Collection of the Academy. 
Found by Mr. Eobert E. Griffith, near Philadelphia. Some- 
what resembles the last, but is more depressed, and the stri^ are 
transverse, not longitudinal, as in that shell ; the cavity beneath, 
also, though of equal pix5portional diameter, is not proportionally 
deep. 
H. THVROiBUs. — P. 123 et seq,, October, 1817. Shell thin, 
fragile, convex, umbilicate ; whorls five, obtusely wrinkled, or 
rather with equidistant, gradually elevated, obtuse lines ; and 
spirally striate, with minute, impressed lines ^ lip widely reflected, 
white and fi.at before, partially concealing the umbilicus ; pillar- 
lip furnished with a veiy oblique tooth. Breadth four-fifths to 
nine-tenths of an moh. 
This species very much 'resembles H. albolabris of Nicholsoffis 
Encyc., Amer. ed., but is umbilicated, and toothed on the pillar- 
lip. It is much less common. This shell was indicated in the 
American edition of the Encyclopaedia, but its characters were not 
laid down. 
2 
