Marsh—On a New Species of Canthocamptus. 113 
small spines. The sensory seta of the fourth segment extends 
beyond the end of the eighth segment. The seventh and eighth 
segments are somewhat indistinctly separated. The first an¬ 
tenna of the male is composed of seven apparent segments, of 
which the first three are very much swollen. 
In the female the endopodite of the first swimming foot is 
three jointed, and is longer than the exopodite. (Plate IX, fig. 
6.) The endopodites of the second, third, and fourth feet are 
two-jointed. The apical segment of the endopodite of the sec¬ 
ond foot is armed with two lateral and two terminal setae, that 
of the third foot is armed with three laterals and two terminals, 
while that of the fourth is armed with three terminal setae. 
(Plate IX, figs. 7, 8, and 9.) 
In the male the endopodites of the first and third feet are 
three-jointed, and the second and fourth two-jointed. The ap¬ 
ical segment of the endopodite of the second foot is. armed with 
three lateral and two terminal setae. (Plate IX, fig. 10.) 
The second segment of the endopodite of the third foot is armed 
with one long seta, and the apical segment with two terminal 
setae. (Plate IX, fig. 11.) The apical segment of the endop¬ 
odite of the fourth foot is. armed with two lateral and three ter¬ 
minal setae. 
The fifth feet in both male and female are unusually elon¬ 
gated. In the male (Plate IX, fig. 12) the outer part consists 
of a slender segment armed on the exterior margin with two 
stout spines, a short and a long spine at the apex, and a slender 
seta about midway of the interior margin. The inner part of 
the foot is quadrangular, and armed at the apex with two stout 
spines of which the inner is twice as long as the outer. 
The two parts of the fifth foot of the female (Plate IX, fig. 
13) a,re nearly ectual in length, and are long and slender, the 
length being about six times the width. The outer part is 
armed like that of the male, but the spines are weaker and the 
seta on the internal margin is on the apical portion of the 
segment. The inner part of the foot is armed with six setae, of 
which two are apical, one external, and three internal. 
Habitat, Alturas Inlet. 
8 
