427 
other plates and covers the hind edge of the third and Ihe fore 
edge of the fifth side plate; it is so large, that the limb is only 
an appendix on the inner side. The fifth and the sixth plates have 
almost the same shape, the hind edges strongly curvate; the seventh 
side plate is almost quadrate, very little, and totally hidden under 
the sixth. 
The branchiæ are narrow, sacciform (see the fig. of p. 2, fig. 3); 
the marsupial plates very narrow with very long marginal setæ (see 
