Explanation of the Plates.
Fig.
Fig. 2
Fig.
Fig. 3
Fig. 4
Fig. 5.
Fig. 6.
Fig. 7.
Plate I.
. The first right outer gill of Porcellio scaber, male, as viewed from the inner or dorsal side.
Tr., — the respiratory tree.
Gr.a., — the grooved area of chitine.
Ch., — chitine at the junction of the two faces of the gill.
Art., ‘fy articulation of the gill with the basal joint.
. Markings of the chitine on the inner face of the general part of the gill.
a. Section of the grooved area of chitine.
Gr., — groove.
b. The grooved area of chitine.
Gr^f£— groove.
P.a., — polyginal area, showing markings.
. Cross-section of the gill of Porcellio scaber, taken in the direction of the line ss', Fig. 1. '.V,
Ch., — chitine.
Hy., — hypoderm.
Hy. Nu., — hypodermic nuclei.
PL, — pillar.
B.C., — blood cavity.
B.ch., — blood chamber.
B.sp., — blood space.
Op., — opening of tree.
Cv.tr.,^- cavity of tree,
Bd., — ridge of chitine.
Portion of the respiratory tree, showing terminations of the branches.
Section of a portion of the respiratory tree and the adjoining wall of the gill.
Ch., — chitine.
Hy., — hypoderm.
Hy. Nu., — hypodermic nuclei.
B. Sp., — blood space.
W.b.c.,V- wall of blood cavity.
Tr., — cavity of branch of the tree.
Section of a portion of the respiratory tree at its base; the section was taken parallel with ;the
faces of the gill.
Gr.ch., — grooved chitine.
Bd.chm., ® blood chamber.
Op.tr., — opening of tree.
Br.tr., — branch of tree.
W.b.c., — wall of blood cavity.
B. Sp., — blood space.
Hy. Nu., — hypodermic nuclei.
B.c.,E- blood corpuscle.
Leu., — leucocytes.
Fig. 8. Section of the inner gill of Porcellio scaber.
Ch., — chitine.
Hy., — hypoderm.
P., — pillar.
B.C., — blood cavity.
Plate II.
Fig. 9. The first right outer gill of Ligidium hypnorum, as viewed from the inner or dorsal side.
In.ch., S incurrent channel.
Ex.ch., — excurrent channel.
Art., — articulation of the gill with the basal joint.
Fig. 10. Cross-section of the gill of Ligidium hypnorum, taken in the direction of the line ss', Fig, 9.
Ch., — chitine.
Hy., — hypoderm.
W.b.c., — wall of blood cavity.
Ex.ch., —^ excurrent c h a n n ||||l|
Fig. 11. The first right outer gill of Oniscus murarius, male, as viewed from the inner or dorsal surface.
In.ch., — incurrent channel.
Ex.ch., — excurrent channel.
Rd.ch., — radiating channels.
Art. — articulation of gill with the basal joint.
Fig. 12. Cross-section of the gill, taken in the direction of the line ss', Fig. 11.
Ch., — chitine.
Hy., — hypoderm.
Hy.pl., — hypodermic pillar,
v.b.c., — ventral blood chamber.
d.b.c., — dorsal blood chamber.
Pt., — double-walled partition between the dorsal and ventral blood chambers.
Fk., — forking of the partition.
W.b.c., — walls of blood chambers.
In.ch. — incurrent channel.
Ex.ch., — excurrent channel.
Fig. 13. Cross-section of the special part of the gill, taken in the direction of the line RR', Fig. 11. I SB — chitine.
d.a.c., — dorsal air chamber.
v.a.c., — ventral air chamber,
n — dorsal blood chamber,
v.b.c., — ventral blood chamber,
m.b.c., —| middle blood chamber.
Hy.pl., — hypodermic pillar.
W.b.oi, — walls of blood cavity.
Fig. 14. The course of the circulation of the blood in the gill of Oniscus murarius. The dotted arrows show
the direction taken by the particles of incurrent or venous blood; the lined arrows that of the excurrent
or arterial blood.