96 
ME. W. K. BROOKS ON LUCIFER: 
In the adult the appendage (fig. 68) is extremely simple, short, stout, two-jointed, 
flattened on its inner and rounded on its outer surface, with a fringe of short, stout, 
equal, plumose hairs around the edge of the flattened surface. 
The second maxilliped. 
It is difficult to decide with certainty whether this appendage is represented by 
a bud in the Nauplius or not. If the first pair of buds become the metastoma, 
as seems probable from their position with reference to the mandibles and from the 
analogy of the Euphausia nauplius, the second pair of maxillipeds are not represented, 
but if the first pair of buds are the rudimentary first maxillae the last pair are the 
second maxillipeds. At any rate the appendages are present in the first Protozo'ea 
(fig. 33), and they are essentially like the first parr, but much smaller. 
In the last Zo'ea stage (fig. 49) they are larger, although still smaller than the first, 
and their inner edges carry only three short hairs which are not plumose. 
In the Schizopod stage (fig. 59, Mp. 2) a long basal joint carries a four-jointed 
endopoclite and an unjointed exopodite of nearly equal length. The outer half of the 
exopodite is fringed by fourteen long, simple hairs, and the terminal joint of the 
endopodite has a few short plumose hairs. 
In the next stage the exopodite is absent, and the long six-jointed limb (fig. 70) is 
bent into the shape which is so characteristic of the adult Sergestidce. 
The basal joint (1) is quite short and stout. The next joint (2) is longer and has 
five plumose hairs, almost as long as the joint, on one side and three on the other. 
The next joint (3) is the longest, and carries six plumose hairs. The next (4) is 
about as long as the second, and the bend in the limb occurs in this joint and between 
it and the third. It carries ten plumose hairs about as long as those in the other 
joints, and arranged in a single close rank. The fifth and sixth joints are shorter than 
any of the others except the first; they are about equal in length, and the fifth carries 
ten, the sixth six long plumose hairs. 
The third maxilliped . 
This appendage makes its appearance as a bilobed rudiment (figs. 43 and 45, Mp. 3), 
at the end of the Zoea series, and it becomes developed into a Schizopod foot, at the 
next or first Schizopod stage (fig. 59, Mp. 3). A stout basal portion which appears to 
be two-jointed, carries an unjointed exopodite, and a four-jointed endopodite. The 
latter branch is the longest, and its tip carries four rather short plumose hairs. The 
outer half of the exopodite carries fourteen long simple hairs. 
At the end of the Schizopod period the limb loses its exopodite entirely, lengthens 
and becomes a slender six-jointed leg, fringed by a double row of short hairs, as 
shown in fig. 61, Mp. 3. 
