464 
PACIFIC SCIENCE, Vol. XXI, October 1967 
Fig. 4. Trizopagurus magnificus. The paired mandibles of zoeae I-IV. Left column, posterior surface; 
right column, anterior surface. 
Third Zoea 
carapace length: 2.15-2.40 mm (8 speci- 
mens) 
TOTAL length: 4.25-4.55 mm (5 speci- 
mens) 
The most obvious gross change is that the 
telson is now articulated with the sixth ab- 
dominal somite, and a pair of uropods has ap- 
peared. The posterior telson margin bears 
8 — (— 1 — (— 8 telson processes, the median 
process being articulated and of the same type | 
as the adjacent ones. However, the fourth pro- 
cess from each side is much enlarged, non- 
plumose, and is fused to the telson. There is 
long plumose seta at the distal lateral margin. 
The appendage is otherwise basically un- 
changed. 
The second maxilliped, like the first, has 
lost the fine row of setules on the endopodite, 
replacing them with long plumose setae on the 
two middle segments, and the exopodite has 
added 2 natatory setae. 
The third maxilliped, a mere bud in the 
first stage but now functional, consists of a 
basipodite bearing an exopodite with 5 or 6 
natatory setae. On the basipodite a lobe which 
will be the endopodite originates proximally 
and may bear a terminal seta. 
