LIST OF WOODCUTS. PAGE
Frontispiece.
The Common Crayfish,
Astacus fluviatilis, (male)
Fig.
1.
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2.
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Dorsal views of male and female
18
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3.
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Ventral views of male and female
21
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4.
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The gills.
26
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5.
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Dissection
Astacus fluviatilis.
„
6
Side view of the male.
from the dorsal side
(male). yy
6.
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Longitudinal vertical section
THE ALIMENTARY CANAL 7. yy
8.
,,
28
of
.
.
29
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A GASTROLITH OR “CRAB’S EYE ’’
.
30
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Attachment
of
young
MERET OF MOTHER
to
swim-
.
.
.
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9.
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Structure of the stomach
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10.
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Longitudinal section of the sto¬ mach
41 53
.
.
56
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11.
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Eoof of the stomach, from within
60
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12.
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Dissection from the side (male) .
62
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13.
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Alimentary canal from above
.
65
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14.
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Blood corpuscles
....
68
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15.
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16.
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The heart
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17.
,,
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Structure of the gills
v
18.
„
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The green gland
-Transverse section of thorax
..
70 72
.
.
76
....
83
