60 
ROOM VIII. commerce, with several varieties of pearls ; oysters, 
NaiThist. other shells, showing the disease that pro¬ 
duces pearls: pinna squamosa with its beard, out 
. ' of v/hich gloves and stockings are . manufactured ; 
various shells whose situation in the system has not 
yet been in any degree ascertained; such as the 
argonauts, or paper nautili: tw^o species of nautilus, 
commonly denominated chamber nautili; w^ater- 
pot shells, &c. 
Table 32 contains a collection of the shells of 
the class Cirripedes, ovBarnacles, which are arran¬ 
ged into two orders. In the first order Campyloso- 
mata are placed the otion or ear-barnacle; several 
species of cineras ; various species of pentelasmis, 
the greater portion of wliich have been confounded 
together as but two species; two species of pollicipes 
or horn of plenty barnacles, &c. The second or¬ 
der Acarnptosomata contains wdiat are generally 
denominated acorn-shells, such as the coronula and 
tubicinella, which are found imbedded in the skin 
of various species of wT.ale ; the chelonobia or tur¬ 
tle barnacle, of wdrich there are two species both 
inhabiting the shell of turtles; three species of 
conia or barnacle composed of four shells; many 
species of balanus or acorn-shell properly so called; 
and at the end of the case several newly discovered 
genera that are parasitical or coral, such as Adnae, 
Acastas, Creusiee, Megatremata, Pyrgomata, &c. 
Tables 33 to 36 contain Crustacea, ,as limulus or 
king-crab; 
