Fig. 1

a. First thoracic segment

b. Last thoracic segment, with its triangular upraised area

c. Marginal spiniferous processes, without striæ, of the segment

d. Granules on the carapace

e. Articulating surface of the thoracic and abdominal segments

f. Marginal ridge of the cephalic shield

g. Right eye

h. Protruded lateroposterior angles of the shield

i. Hollows corresponding with the basal joints of the ectognaths

j. Swimming-foot, showing the terminal palette with the rounded and regular outline of its end

k. U-shaped ridge

Fig. 2

Marginal ridge of the cephalic shield

Fig. 3

First appendage, to show the knob or pad on the posterior border of the articulation

Fig. 4

Triangular upraised area of the last thoracic segment as seen from the left, to show its slopes