322 Merrill—Structure and Affinities of Bunops Scutifrons. 
It is sparsely covered with fine, short spines, arranged in? 
transverse rows at the proximal end, but reduced to scattered 
bunches and single hairs at the opposite end. At the terminal 
end there is a circle of four or five small teeth, and from be¬ 
tween these spring eight or ten delicate sense hairs of about, 
uniform length. The tip of each sense f^ir is enlarged slightly 
to form a knob. There are two pairs of sense hairs on the 
outer side of the distal half of the antennule. The farther pair- 
is situated about one-sixth the length of the antennule from the 
end; the other pair about the same distance from the first. 
There is no distinction between the basal and terminal parts of 
the hairs. They are curved, taper slightly, and are of about 
equal length. There is also on the proximal end very near the base r 
a single sense hair which is about as long as the terminal hairs. 
It is very stout at the base and tapers abruptly to a delicate^ 
hair. The basal is about half as long as the terminal part. 
MEASUREMENTS OF ANTENNULE. 
Length .. 0.402 mm. 
Sense hairs additional.. 0.052 mm. 
Breadth. 0.019 mm. 
Greatest breadth. 0.024 mm. 
Least breadth. 0.0b mm. 
Lateral sense hairs. 0.021mm. 
(B.) Antennae. 
PI. XIV, Fig. 1. 
0-0-0-3 0-1-0-1 
Formula of setae, -of spines, -. 
1-1-3 1 0-0-0 
The antennae are of medium length and slender. The basal 
joint is long and slender, projecting considerably beyond the 
head. It is ringed at the base, the rings extending less than half 
the entire length of the joint. Along the dorsal side there is a 
row of short, stiff bristles, running from the rings lengthwise 
to the end of the basal joint, and the tip has a few scattered. 
