Third and Fourth Legs. 
329 
developed. The triangular tip has three slight divisions. The 
dorsal part of the maxillary process has five bi-articulate, falci¬ 
form, incurved setae. The ventral side near the base is covered 
with fine bristles. 
THIRD AND FOURTH LEGS. 
PI. XV, Figs. 3, 4. 
As in all the family the outer ramus of these legs is well 
developed, thin and leaf-like. In the third leg * the exterior 
(<?) is almost as well developed as the interior branch. It is 
broad, rectangular and very thin, bearing three very long cili¬ 
ated setae at the end, the middle one being the longest, and the 
two at the side, curving back. The interior ramus (i) is smaller 
than in the second leg, but of the same shape. It shows the 
same trace of anterior and posterior lobing that former legs 
show, and the same two rows of setae, distal and proximal. 
The distal row consists of eight setae. The basal joints are 
very stout as compared with the distal ones. The three an¬ 
terior setae are ciliated on one edge of the distal joint. The 
maxillary process is almost as in the second leg, but has dense 
hairs at the triangular tip, and four or five setae at the side, 
shorter than in the second leg. 
The exterior ramus of the fourth leg (e) is not nearly as well 
developed as in the third leg, and not as well as in the same leg 
of Acantholeheris. It has four ciliated setae and is thin and 
delicate. The inner branch is as broad as in the third leg and 
shows traces of lobing. The distal setae are better developed 
than the proximal. They are four in number, unguiform, bi- 
articulate, pectinatelv ciliated on one edge. The proximal 
edge has five setae, each two-jointed. The basal joint of each 
narrows abruptly into a delicate seta, constituting the second 
joint. 
The maxillary process has three accessory parts, the process 
called by Lund “the terminal seta of the stem,” one large 
geniculate seta, and four setae on the dorsal side as in the 
third leg. 
* In the plate the third and fourth legs are shown on a scale twice as 
great as the others, so as to make plain the numerous details. 
