66 
ROOM VIII. ^^0 Museum at Paris, of which there is a mo- 
Nat. Hist. in wax, in this compartment. The original 
was brought by M. Hiion, one of the Officers, 
sent in search of La Peyrouse, from the South 
Seas. This singular shell is suspended below the 
belly of the animal, and seems destined to cover 
and protect the heart and branchise. 
Table 31. Miscellaneous. A dissected Nau¬ 
tilus, 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, fattened 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- 
mata ; the byssus, or beard of the pinna, and a 
pair of gloves, made of the same substance, &c. 
This table contains also the Annulata sedentaria, 
or shells of annulated worms, the third order of 
the ninth class; amongst which are Siliquaria, 
several Dentalia, Magilus, Galeolaria (both very 
rare), Verraicularia, Serpularia, &c. 
NINTH, 
