60 
ROOM VIII. 
Nat. Hist. 
At the end of Table 30 are deposited the -species 
of the class Brachiopoda, which were formerly ar¬ 
ranged with the Acephala; such as Lingula or 
Duck-shell; Terebratula ; Criopus and Orbicula. 
Table 31, which stands before the left window, 
contains a collection of the shells of the class Cir- 
ripedes, or Barnacles , which are arranged into 
two orders. In the first order Campylosomata are 
placed the otion or ear-barnacle; several species of 
cineras; various species of pentelasmis, the greater 
portion of which have been confounded together 
as but two species; three species of pollicipes or 
horn of plenty barnacles, &c. The second or¬ 
der Acamptosomata contains what are generally 
denominated acorn shells, such as the coronula and 
tubicinella, which are found imbedded in the skin 
of various species of whale; the chelonobia or tur¬ 
tle-barnacle, of which 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 Adna, 
Acasta, Creusia, Megatrema, Pyrgoma, &c. 
Table 32 to 35 contain Crustacea, as Limu- 
lus or King-Crab ; Gecarcinus or Land-Crab ; Mi- 
thrax or Spiny-crab ; Birgus; Pagurus or Hermit- 
crab ; Palinurus or Cray-fish, of which the smooth¬ 
tailed, 
