NO. 3663 CIRRIPEDIA—ROSS 1 7 
at the distal extremity they are significantly longer and more sparsely 
concentrated. A single row of long setae occurs on the outer lateral 
face, above and oblique to the basal margin of the appendage. 
Five teeth, including the inferior angle, occur along the cutting 
edge of the mandible (fig. 3a). The distance between the teeth de- 
creases by about one-half proceeding from the first tooth to the 
inferior angle. The inferior angle is simple, not molariform, and does 
not project forward beyond the fourth tooth. The second and occa- 
sionally the third tooth is bifid, or it bears subsidiary cusps. 
Maxilla I has a straight cutting edge, although on one specimen 
dissected there appears to be a minute notch above the center. The 
spines are separable into three poorly defined groups, the apical 
consisting of two long, stout spines, a central group of 10-14 spines 
of varying lengths and diameters, and a basal cluster of about 7-12 
short, very slender spines. 
Mazxilla II is tall, slender, and the anterior edge distinctly bilobed 
(fig. 3e). At the juncture of the two lobes there is a large patch of 
short, stiff bristles. 
The anterior ramus of cirrus I is slightly longer than the posterior 
ramus, the intermediate articles of which are strongly protuberant, 
whereas those of the anterior ramus are less so (fig. 3f). The anterior 
ramus of cirri II and III are longer than the posterior. The inter- 
mediate articles of both rami of cirrus II are strongly protuberant, 
but less so in cirrus III (figs. 3g, 4). Cirri IV-VI are essentially equal 
in length, with rami of more or less similar lengths. At each articu- 
lation along the greater curvature of the intermediate articles of 
cirri [V-VI there are two to three short, slender bristles, one short, 
stout bristle, and one to two very short, fine bristles. Immediately 
below each articulation of the inner lateral faces of both rami of 
the posterior three pair of cirri there is a row of short, triangular 
spines. Chaetotaxis along the anterior curvature of intermediate 
articles of cirri [V-VI is ctenopod, there being four pairs of setae on 
each article. 
A count of the segments for specimen 1 above (fig. 3) is as follows: 
I IL III IV Vv VI 
anterior 19 16 14 25 26 29 
right ¢ a we aa aaa a aes. 
posterior es 12 12 31 31 28 
eta ee LS ERS I RD 
posterior 15 14 13 31 32 ay 
A summary of the data on the cirri of the four specimens dissected 
are summarized below. 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: 
