Index. 
Land (hells, method of colle&ing, N° 
Langius, his fyftem of (hells, 
Layer of (hells, laft formed, white, 
Lepas, fpecies of, 
Light, effefts of, on (hells, 
Limax , generic charadter of, 
Limpet , fee Patella , 
Lifter , his fyftem of (hells, 
M. 
MaSlra , fpecies of, 
Moderns , progrefs of, in conchology, 
Muller , his fyftem of (hells, 
Multivalves , terms of, defined, 
Murex, fpecies of, 
MuJJel , , fee Mytilus , 
Afytf, fpecies of, 
margaritifera yields pearl and 
mother-of-pearl, 
Mytilus , fpecies of, 
margaritiferus produces pearls 
N. 
Nautilus, fpecies of, 
Nereis, generic character of, 
Nerita, (pecies of, 
O. 
Organs fecreting colouring matter, 
enlarge, 
OJirea, (pecies of, 
Oyjler, fee OJirea edulis, 
employed as food, 
of different kinds, 
grows on trees in warm cli- 
mates, 
in Jamaica, 
the Britifti noted among the 
Romans, 
retains its fuperi- 
ority, 
management of, 
liquid of, feen by the micro- 
fcope, 
P. 
Patella, fpecies of, 
Pearl, component parts of, 
found in mother-of-pearl (hells, 
fuppofed to be a morbid con- 
cretion, 
from external injury, 
difcovery of its formation by 
Linnaeus, 
fifliery, 
in Britain, 
in Ceylon, 
CONCH OLO 
G Y. 
4.85 
137 
Pholas, fpecies of, 
N c 
5 26 
Snails , fee Helix , H' 
> 66 
6 
ftriata perforates wood acrofs 
Solen, fpecies of, 
26 
97 
the fibre, 
1 1 1 
Species of (hells enumerated, 
65 
25 
Pilgrims x ifiting the Holy Land, wear 
found Mil, 
66 
108 
the fcallop, 
37 
Spines produced, 
217 
15 
Pinna , fpecies of, 
45 
Spio, generic character of, 
35 
60 
Polijhing (hells, 
M 3 
Spires of the fnell, turns increafed, 
85 
5 
with leather, 
144 
Spondylus, fpecies of, 
34 
pumice-ftone, 
MJ 
Sprat's, Bithop, hiftory of the oyfter, 
43 
Dutch method, 
M 3 
Stria, formation of, 
98 
3 1 
Porcelain (hells, colours of, 
103 
Strombus, fpecies of, 
53 
4 
have an external layer 
Syftems of conchology, 
4 
formed, 
104 
Lifters, 
5 
17 
proved, 
105 
Langius’s, 
6 
54 
become thicker, 
106 
Breynius’s, 
7 
44 
Tournefort’s, 
8 
27 
R. 
D’Argenville’s, 
9 
Razor-Jheath, fee So/en, 
26 
Klein’s, 
10 
ib . 
Reaumur's inveftigation of the forma- 
Adanfon’s, 
11 
44 
tion of (hells, 
73 
Geoffroy’s, 
1 % 
, ib. 
opinion miftaken, 
74 
Muller’s, 
33 
controverted, 
77 
Da Coda’s, 
14 
experiments, 
79 
47 
Ribs of (hells, formation of, 
114 
T. 
1 S 
only on fea-ftiells, 
»5 
Tellina, fpecies of, 
29 
58 
hollow, 
119 
Teredo, fpecies of, 
63 
S. 
Terebella , generic character of, 
35 
Sabella , fpecies of, 
64 
Terms explained, 
16 
Scallop , fee OJirea maxima , 
37 
in multivalves, 
37 
96 
worn by pilgrims, 
in 
bivalves, 
18 
37 
Sea-ear , fee Ha/iotis , 
59 
univalves, 
39 
ib . 
Sea-wing, fee Pinna, 
45 
Tejlaceous animals both oviparous 
38 
Sepia, generic character of. 
M 
and viviparous. 
72 
39 
Serpula, fpecies of, 
62 
detached from 
Shells, conftituent parts of, 
7 1 
the (hell, 
86 
40 
porcellaneous, 
68 
Tetkys , generic character of. 
35 
jii 
mother-of-pearl, 
69 
Tooth-Jhell, fee Dentalium, 
61 
formed in the egg, 
75 
Tournef art's fyftem of (hells. 
8 
ib . 
laft formed, 
76 
Triton, generic character of, 
3 5 
procefs of their formation, 
80 
Trochus, fpecies of. 
55 
40 
formed by fecretion from the 
Tropical (hells mod beautiful, 
127 
41 
animal, 
81 
Tubercles on (hells, formation of, 
116 
time neceflary, 
82 
Turbo , fpecies of, 
5 6 
42 
layers feen by burning, 
84 
U. 
growth of, interrupted, 
99 
Umbilicus, formation of, 
XII 
diftingui(hed by 
CO- 
Univalves, terms of, defined, 
19 
60 
lour, 
IOI 
generic character of, 
23 
70 
lower valve colourlefs, 
IOQ 
121 
fpiral, four claffes, 
III 
V. 
derive their form from 
the 
Valve, lower, of (hells, colourlefs, 
109 
x 22 
animal, 
Z 1 2 
Venus, fpecies of, 
33 
123 
found on every part of the 
Valuta, fpecies of, 
5 * 
globe. 
125 
Volute, fee Voluta, 
ib. 
124 
land numerous, 
126 
W. 
140 
tropical, mod beautiful, 
127 
Wedge-Jhell, fee Donax, 
3 2 
14 * 
fea, methods of fifhing. 
338 
Whelk, fee Buccinum, 
5 2 
142 
Ship-worm, natural hiftory of 
63 
Wreath, fee Turbo , 
56 
CONCHYLIA, 
