123 
In the fore-part of the middle-line of the carapace there. are 
3 little teeth; but they are not to be found in all the specimens. 
lst antenna is unaltered, but flagellum in 2nd antenna is longer 
than the squama, though this is considerably increased in length, 
and the peduncular part (of the flagellum) is well defined, but has 
only å single joint; the terminal part is still unarticulated. The 
Oral parts are about unaltered. The pereiopods are somewhat length- 
ened; 2nd pair are now cheliform, and Sth pair have 7 distinct 
joints. Abdomen has 7 joints, and the uropoda are free. 
4th (known) stage (figs. 22—31, st. IV). 
Total length 12 mm. 
The carapace has 4 teeth in the middle lime. The S5th ab- 
dominal segment has a little tooth at each side of the hind edge. 
The telson is very much altered; it is in the distal part not much 
broader than in the forepart, and it has but 7 pairs of spines, the 
2 pairs of which are placed at the side-edge. 
The antennæ and the oral parts are about as in the pre- 
ceding stage; but in 2Znd maxilla the exopodite is much more 
developed, especially its hinder lappet. The exopodites of the 
pereiopoda have 10 pairs of setæ, and the pereiopoda are some- 
what lengthened in comparison with the preceding stage. The 
pleopoda are now cleft, but have a trace of articulation. The endo- 
podites of the uropoda are about as long as the exopodites. 
5th (known) stage (figs. 22—31, st. V). 
Total length 19 mm. 
The rostrum has 11 teeth, 1 of which is but a little from 
the tip and 3—4 on the carapace. The telson is about linear, has 
8 pairs of spines, and is not emarginate at the tip. 
In the 2nd antenna the peduncular part of the flagellum has 
2 joints, and the flagellum itself is unarticulated, but is somewhat 
damaged in all the specimens. The orål parts are about as in the 
preceding stage. The pereiopoda are still more lengthened than 
in the 4th stage, and the 4th—5th pairs are very like the 
