places, one transverse and the other somewhat oblique.

4 e. One of the bristles of the embryo, highly magnified.

Fig. 5. Hormurus australasia.

5 a. Ventral view of anterior part of embryo. The cheliceræ are

concealed by the large chelæ.

5 b. Transverse section through distal

part of chele and the secreting cells (sc) surrounding them. sc', dorsal secreting cells.

125

X I'

Fig. 6. Palamnæus Thorellii. Dorsal view of embryo x

10

3 b.