recent shells. 193 
TWELFTH CLASS MULLUSCA. 
SECOND ORDER GASTEROPODA, 
Caryprraciana, Fourrn Famiry. 
Crepidula. 
“Shell oblong, concave within, spire very much inclined to~ 
wards the margin ; aperture partly closed by an horizontal 
Jawina.” 
“Animal, head forked anteriorly, two conical tentacula, with 
eyes at their base, mouth simple without jaws, foot very 
small.” 
Crepidula fornicata: ‘Shell oval, posteriorly obliquely 
curved ; posterior lip concave.” 
This species inhabits the Gulf; is frequently brought up 
with oysters—the shell is shaped like alittle sabot, it is of 
a gray colour, often streaked with brown ; within shining, 
and marbled with chesnut, the lamina is white, thin and se- 
mitransparent. 
Third Order TRACHELIPODA, 
Coremacea, Fifth Family, 
Three of these are common here ; they are land animals, 
Helix. 
*¢ Shell orbicular, convex, or conoidal ; spiré very little 
elevated ; aperture entire, wider than long, oblique and near 
the axis of the shell ; margins disunited by the projection of 
the penultimate whorl,” 
The animals live on vegetables,and remain dormant during 
the winter. 
There are two species about Quebec ; they do not appear 
to be among those described in ‘* Les Animaux sans verlé- 
bres ;” but the species being so numerous, and De Lamarck 
having only described those in his cabinet, render it uncer- 
tain whether they may be new or not. ‘The first, perhaps a 
variety of 
Ilclix hortensis. ‘* Shell imperforate ; spire Mat; epi- 
dermis yellow whitish; whorl transversely striated ; lip 
Y 2 within 
