t 7 1 ] 
the moft curious or this Kind are, the Arabian Let¬ 
ter Shell, the Map Shell, the Argus, and Falfe 
Argus, the Tortoife Porcellain, the Beetle, the 
Chinefe and Boat Porcellains. The common Cow¬ 
ries, or Guinea Money, come under this Title, 
Nautili , Sailor Shells. The French call this 
Kind Le Voilier. It has been conjedtured that Men 
firit learned the Ufe of Sails from the little Filh 
that inhabits it. It often fwims on the Surface of 
the Sea, throwing ouc a Membrane that ferves it 
inftead of a Sail; and it has other Parts whirh it 
ufes as Oars and a Rudder. It is a fpiral Shell, 
with a large and roundifh Aperture ; the laft Vo¬ 
lution is remarkably large in proportion to the reft, 
otherwife not unlike lome Kind of Snails that have 
deprefled Clavicles. The whole Shell is by Parti¬ 
tions divided into feveral Chambers, which com¬ 
municate one with the other by Means of a Imali 
Pipe in each Partition. Among the Specimens, 
one of the Shells is cut vertically in fuch a Manner 
as to difeover the different Concamerations. Worth 
obferving are the fma' 1 thin Nautilus, the Paper 
Nautilus from the Mediterranean , and feme from 
the Eaft Indies in Size various, many in their na¬ 
tural State, others polilhed. It has been conjectu¬ 
red that the Cornu Ammonis , deferibed among the 
foflil Shells, takes its Shape from fome Species of the 
Nautilus; but this is far from being afeertained. 
Dentalia , Tooth Shells. Th s is a Ihelly Tube 
refembhng the Tulle of an Elephant, or the Horn 
of fome Animal which is a lirtJe bent: fome of 
them are fmooth, others ftricated ; the fmooth 
Kind are white, and not unfrequently tipped with 
red ; the others lome white, others green. The 
common Tooth Shell, the Dog Tooth Shell, and 
others are to be feen among the Specimens. 
Fermi • 
