NO. 3663 CIRRIPEDIA—ROSS a 
Maxilla IT has a distinctly bilobed anterior margin. The appendage 
is broad, but the height is somewhat greater. 
The anterior ramus of cirrus I is slightly longer than the posterior 
ramus, and all of the articles of both rami are broader than they are 
high. The terminal article of the posterior ramus bears a few comb 
setae. The same relationships as found in cirrus I hold for cirrus II 
except that comb setae are found on the terminal articles of both 
rami. The comb setae on both cirri lack basal guards. Cirrus III is 
not modified. Cirri III-VI are essentially equal in length with equal 
rami. At each articulation along the posterior curvature of the inter- 
mediate articles of cirri [II-VI there are 1-3 long, slender setae and 
1-3 short, slender setae. There are no bristles or teeth arrayed along 
the lateral faces of the posterior cirri. Pigment spots occur at each 
articulation along the posterior border of the cirri and along the 
whole length of the anterior border of the cirri. Chaetotaxis of the 
anterior border of the intermediate articles of cirri IV-VI is typically 
ctenopod, there being 5 pairs. 
A count of the segments of specimen number 1, illustrated in 
figure 1, is as follows: 
I I UI IV Vv VI 
anterior 8 6 14. We? 19 19 
right ; ef a ray a oor ars 
posterior 6 6 15 17 19 19 
anterior 7 if is 18 19 19 
left = = a ais ar Bo 
posterior 6 if 15 XX 19 19 
Data on the cirral counts of the five specimens dissected are pre- 
sented below. The range (R) and mean (X) values for the number 
of segments in the anterior (a) and posterior (p) rami of the right 
side are as follows: 
] II III I\ Ny VI 
1 fain. et ee haat Silas amped” aiid adic ae Seana heals Gn) 
rele SG aes aa aa 5 5 5 5 5 5 5 
R 6-8 5-6 6-9 5-7 14-15 14-16 13-17 15-17 16-19 16-19 17-19 17-19 
AO.600) v4 6.0) 14/5 1570° 154)” 16-0 ° ‘1747 1678) 18.0 1746 
The penis is annulated throughout its length, and it is covered 
with long bristles. The distal extremity is densely clothed with 
bristles. There is no basidorsal point. 
Remarxs.—The nominal subspecies Chthamalus stellatus angusti- 
tergum is readily separable from C. stellatus stellatus (Poli, 1791) 
on taxonomic as well as geographic and reproductive grounds. Al- 
though apparently alike superficially, differences exist that clearly 
warrant the recognition of this Caribbean barnacle at the specific 
level. 
