67 
in this compartment. The original was brought room viii. 
by M. Huon, one of the officers sent in search nat. Hist. 
of La Peyrouse, from the South Seas. 
Table 31 contains the parts of shells and 
the products of molluscous animals. A dissected 
Nautilus, shewing the interior chambers of the 
shell; one valve of a large Meleagrina marga- 
ritifera, or pearl muscle—various specimens of 
pearls, which are produced by disease in shells. 
Some of the pearls, in this case, attached to 
fragments of shell, shew the manner in which 
the animal may be made to produce apparently 
fine pearls, by an artificial process. Spherules 
of shell, or some other substance, flattened at 
the bottom, are forcibly inserted between the 
animal and the shell, in such>a way that it can¬ 
not displace it—which in a short time is covered 
with a layer of pearly matter, secreted by the 
mantle of the animal. Two pair, and a single 
valve, of extraordinary size, of the Pinna squa¬ 
mosa 5 the byssus, or beard of the pinna, and a 
pair of gloves made of the same substance, &c. 
This table contains also the Annulata Seden- 
TARiA, or shells of annulated worms ; amongst 
which are the genera Siliquaria, several Denta- 
lia, Magilus, Galeolaria, (both very rare,) Ver- 
micularia, Serpularia, &c. 
F 2 
NINTH 
