64 
room x. tuation in the system is more or less doubtful; 
NatThjst. as the wendletrap, belly-shell, &c. with the uu- 
z«°iogy. known opercula or lids of shells, &c. 
In cases 25 to 28 are deposited the mollusca 
acephala, or bivalve-shells, amongst which the 
following may be noticed; the ducks-bill lingula, 
sanguineous terebratula, Chinese glass-shell, 
coekscombe and other oysters, spondyles or 
thorny oysters, ziczac, mantle, and other scallops, 
bag pinna, hollow spined pinna. See. ; hammer 
oysters, pernae, pearl-shells, radiated bird- 
shell, chamae, trodachna?, arks, pectuncules, 
venerecardia or heart chama; cockles, amongst 
which the hollow ribbed cockle and several 
heart cockles are the most curious; Venus, of 
which the wampum belt is made, Pensylvanian 
Venus, dione or concha veneris, tellens, &c. 
Mactrae, lutrariae or mud shells, myae or tooth- 
shells, solenes or rasor shells, pholades or 
piercers, teredo or ship-worm, fistulana or gi¬ 
gantic teredo, watering-pot shell, &c. 
No. 28a. contains such species of bivalve 
shells as are useful or noxious to man; as the 
pinna and its beard, out of which gloves and 
stockings are manufactured, several shells exhi¬ 
biting the disease which produces pearls, speci¬ 
mens of stone perforated by Pholades, &c. 
No. 
