434 Scientific Intelligence. 
which it is worthy of careful attention. Indeed, President Hitchcock 
has himself* most scrupulously distinguished the drift furrows from 
those which are due to structure. Sir R. I. Murchison also remarks that 
“the greater number of the deviously parallel scratches on the worn 
surface of the hard crystalline rocks of the north, are, in our opinion, 
clearly mechanical, and cannot be connected with structural condition.” 
Il. Zoonoey. 
This was in Haywood County, a few miles from Waynesville, on the 
Big Pigeon River,—a wild, rough region, abounding in grand scenery 
and rarely visited by man, being little known even to the hunters. _ 
On the situation of the Olfactory Sense in the terrestrial tribe 
re the Gasteropodous Mollusca; by Joseru Leipy, M.D., (Proceed. 
ead. Nat. Sci. of Philadelphia, Dec., 1846, iii, 136.)—While no ob- 
server of the habits of the terrestrial Gasteropoda doubts the existence 
of the sense of smell in them, but on the contrary, asserts positively 
that it does exist, the anatomist has not hitherto been able to point 
out its precise seat. 
vammerdam, in his Biblia Nature, speaks decidedly of the exist- 
t 
situation. Blumenbach remarks, under the head of Vermes, “ Several 
animals of this class appear to have the sense of smelling: as many 
land-snails (Helix pomatia, &c.’””) and afterwards adds, “But the or- 
gan of this sense is hitherto unknown; perhaps it may be the stigma 
thoracicum.” Cuvier, in his Mémoire sur la Limace et le Colimagon, 
afier remarking on the delicacy of this sense, thinks it probable It may 
reside “dans la peau toute entiére, quia beaucoup de texture d’une 
membrane pituitaire.” 
In investigating the anatomy of this tribe of Gasteropodous Mollusca, 
I detected an organ which appeared to have been entirely neglected, or 
has escaped the notice of those who have dissected these animals. It 
is a depression or cul-de-sac, having its orifice beneath the mouth, be- 
tween the inferior lip and the anterior extremity of the podal disk, and 
which in many species of different genera is elongated backwards intO 
podal disk within the visceral cavity. In Bulimus fasciatus it extends 
backwards as far as the tail, and is several times folded upon itsell ; 2 
Glandina truncata it extends the length of the podal disk; in the var 
ous species of Helix it is found from a superficial depression to 4 sac 
the length of the podal disk ; in Succinea obliqua it is of considerable 
length; in Limax and Arion it is a superficial depression ; in an unde- 
* Final Report on the Geology of Massachusetts, p. 385- 
