Thoracic Cirripedia from a Guyot — Z ullo and Newman 
365 
tergal margins of adductor pit bounded by high 
ridge separating pit from deep, narrow articular 
furrow at apex. 
Movable tergum (Figs. 4C, D) squared, but 
with carinal margin . longer than occludent mar- 
gin; three prominent articular ridges present; 
occludent margin bearing small, thin ridge not 
extending to apex; remainder of exterior with- 
out ridges, ornamented only by deep, narrow, 
closely spaced grooves separating growth incre- 
ments; interior of movable tergum flat, smooth. 
Carina (Fig, 4 A) with four ridges terminating 
in articular teeth at rostral border; low, indis- 
tinct ridge borders tergal margin above upper- 
most articulating ridge; basal margin indistinctly 
lobed; lobes corresponding to basal denticulae. 
Rostrum (Fig. 4 A) with five ridges terminat- 
ing in articular teeth at carinal border; apex at 
margin of plate; margin of uppermost ridge 
forming scutal margin; lowermost two ridges 
eroded and indistinct; basal margin deeply and 
irregularly lobed, corresponding to basal den- 
ticulae. 
Articulation" between fixed scutum and fixed 
tergum linear (Fig. 4 B) obscured from exterior; 
fixed scutum (Figs. 4/4, B) articulating with 
rostrum by means of three ridges interposed 
with four ridges on rostrum; main part of plates 
ornamented by low, indistinct, longitudinal ribs 
terminating in basal lobes; depressed triangular 
area bordering movable scutum ornamented by 
deep, sinuous, irregularly spaced, vertical 
grooves; interior of fixed scutum with indistinct 
adductor pit bordered below by thin, low, erect, 
concave adductor myophore or ridge. 
Fixed tergum (Fig. 4 B) with two ridges 
articulating with three ridges on carina; main 
part of plate ornamented by eroded, low, broad, 
longitudinal ribs terminating in regularly spaced 
lobes on basal margin; depressed triangular area 
bordering movable tergum ornamented as in 
fixed scutum; interior of tergum smooth. 
Labrum (Fig. 4 G) concave, bearing several 
minute, conical teeth on crest. 
Palpus (Fig. 4H) elongate-triangular with 
apex at inner margin; row of short spines along 
superior margin, and tuft of longer, curved 
spines at apex on inner margin. 
Mandible (Fig. 41) with three teeth; upper- 
most tooth largest; cutting edge below third 
tooth, and inferior angle pectinate; single, large 
toothlike spine amid smaller spines above in- 
ferior angle. 
Inner maxilla ( Fig. 4/ ) without notch below 
upper two large spines; area between upper two 
large spines and large spines on lower half 
concave, bearing several short spines; lower part 
of cutting edge protrudent, bearing four larger 
spines followed by several small, slender spines 
at inferior angle. 
Outer maxilla (Fig. 4K) notched in center 
of inner margin; inner margin on either side of 
notch bearing row of short spines; superior 
margin bearing numerous long, curved spines. 
Cirrus I densely setose; posterior ramus about 
twice as long as anterior ramus; segments of 
anterior and posterior rami becoming long and 
slender terminally. 
Cirrus II densely setose; posterior ramus about 
one-third again as long as anterior ramus; seg- 
ments of anterior ramus somewhat protrudent; 
segments of posterior ramus becoming long and 
slender terminally. 
Cirrus III more similar to cirri IV— VI than 
to cirri I and II; rami slender, subequal, with 
posterior ramus slightly longer and stouter; 
three to four pairs of spines per segment. 
The number of segments on the cirri of hole 
type ucmp 34713 are as follows: 
Cirrus : 
I 
II 
III 
IV 
V 
VI 
anterior ramus: 
11 
8-9 
17 
18 
22 
27 
posterior ramus: 
15 
13-16 
21-22 
24 
24 
26 
Caudal appendage long, about 2Vi times 
length of pedicel of cirrus VI, with 18 segments. 
Penis not known. 
type DESIGNATION: A single specimen on 
shell of Sip ho sp. with Balanus nascanm Zullo 
sp. nov., designated as holotype UCMP 34713. 
DISCUSSION: Verruca scrippsae is assigned to 
the typical subgenus of Verruca on the basis of 
the indistinct, linear nature of the suture be- 
tween fixed scutum and tergum, and the hori- 
zontal plane of the movable scutum and tergum. 
Pilsbry (1916) recognized four groups of species 
within the subgenus Verruca based on charac- 
teristics of the cirri, the caudal appendage, and 
the base of the shell wall. Verruca scrippsae 
cannot definitely be assigned to any one of these 
groups. 
In the slender nature of the cirri, the mod- 
erately long caudal appendage, and the low ad- 
