NO. 3663 CIRRIPEDIA—ROSS ay 
comb containing 22-28 teeth. Maxilla I with subapical notch, below 
which spines divided into two distinct clusters. 
SUPPLEMENTARY DESCRIPTION.—In the majority of the specimens 
examined, prominent radial ribs or their remnants ornament the 
parietes. The shell is pale grey as is the outer surface of the operculum. 
Internally, near the apices, the opercular plates are tinted pale pink. 
Measurements (in mm) of the five specimens dissected are as 
follows: 
shell opercular plates 
carino-rostraé 
specimen diameter lateral diameter height scutum height tergum height 
i 5.8 5. Pel 1s 1.6 
2 6.1 6.0 745°C 1.8 1.9 
3 8.0 8.0 ayal 155) 1.6 
4 Oe 4.9 2.0 1.2 16.3} 
5 Sy 5.4 5 JL Vhs i 1.2 
The height of the scutum is about one-half its width. The articular 
ridge extends about three-fifths the length of the tergal margin. It 
is straight, and the basal margin is evenly rounded and does not 
project. There is no adductor ridge; the adductor muscle depression 
is very small and deep. Situated on the basitergal angle, which pro- 
jects beyond the tergal margin, is the pit for the depressor muscle. 
The tergum is about one-half as wide as it is high, and the plate 
is exceedingly thick. There is a small, narrow, and clearly delimited 
spur. Crests for the tergal depressor muscle number five to seven. 
The multidenticulate labrum has a shallow, medial, saddle-like 
depression, on each side of which are 11-14 teeth. Short setae are 
dispersed between the teeth along the crest of the labrum (fig. If). 
A large elongate-oval patch of downward-directed spines extends 
obliquely from each side of the superolateral margins toward the 
basimedial portion of the labrum. 
The superior margin of the palp is straight and free of setae (fig. Ic). 
The basal margin is covered with short setae, but those on the supero- 
distal margin are extremely long; all of the setae are clothed with 
spinules. 
The cutting edge of the mandible is armed with five teeth including 
the inferior angle (fig. 1a). The distance between the second and 
third teeth is one-half that between the first and second teeth. The 
fourth tooth is bifid. The inferior angle bears three to four spines, 
above which is the typically developed comb, containing about 
22-28 spinules. 
Maxilla I has a somewhat trilobed cutting edge. There is a promi- 
nent subapical, V-shaped notch, and on some specimens there is a 
suprabasal notch. The spination along the edge is readily separable 
into three zones, the apical consisting of both long and short, stout 
