NO. 3663 CIRRIPEDIA—ROSS if 
Along the cutting edge of the mandible there are six teeth including 
the inferior angle (fig. 2a). The distance between teeth decreases by 
about one-half, proceeding from the first tooth to the fifth. Both the 
second and third teeth have subsidiary cusps. Along the superior 
slope of the third and fourth teeth there are serrations. Similarly, the 
inferior angle is serrate, but very coarsely. 
Maxilla I has a deep subapical notch (fig. 2c). Above the notch 
there are two long, stout spines and one or two shorter, slender 
spines. Below the notch 11-16 long, slender spines and 8-14 shorter, 
slender spines are present. On larger and older specimens there may 
be little distinction between these two spine clusters. 
Maxilla IT is taller than broad and distinctly bilobed. The setae 
on the basal lobe are setulated. 
The rami of cirrus I are grossly unequal in length, the posterior 
ramus being about one-half the length of the anterior ramus (fig. 2/). 
The rami of cirrus IT are essentially equal in length while the posterior 
ramus of cirrus III is slightly longer than the anterior ramus. The 
intermediate and basal articles of the anterior three pairs of cirri are 
squat, not appreciably protuberant. Both rami of cirrus IT and III 
are clothed with long comb setae, which lack basal guards. Cirri 
IV-VI are essentially equal in length with equal rami. At each articu- 
lation along the posterior curvature of the intermediate articles of 
cirri [V—VI there is one short, stout seta, 2-4 long, slender setae, and 
1-2 short, slender setae. On the lateral face of both rami of cirri 
IV-VI immediately below each articulation of the intermediate 
articles, there is a single row of short spines. Chaetotaxis of the inter- 
mediate articles of the posterior three pairs of cirri, along the anterior 
curvature, is ctenopod, there being three pairs of setae. Between or at 
the bases of the distal one or two pairs of setae there are one or two 
short slender setae. 
A count of the segments of the cirri of specimen 1 above, illustrated 
in figure 2, is as follows: 
I II Ii LV V VI 
anterior ramus 22 wn 13 19 21 23 
right Sh OBR om 
posterior ramus 12 il 20 22 25 26 
anterior ramus 23 11 12 18 22 2) 
left Sar ase wes ee par fe 
posterior ramus 12 10 18 21 24 21 
Counts of the cirral segments are summarized below for the five 
specimens dissected. The range (R) and mean (x) values for the 
number of segments in the anterior (a) and posterior (p) rami of the 
cirri of the right side are as follows: 
