. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 325 articular ridge in the middle. The occludcnt edge is broad and flat, obliquely ridged in the lower part. Groups of intricately branching crests at the two basal angles serve for the attachment of the de- pressor muscles. The outside is regularly ridged transversely when unworn and has one or more shallow radial impressed grooves. The tergum has a bisinuate scutal border; basal margin formed of two subequal arcs, the posterior one occupied by the deeply cut lateral depressor muscle crests, which in basal view are se
. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 325 articular ridge in the middle. The occludcnt edge is broad and flat, obliquely ridged in the lower part. Groups of intricately branching crests at the two basal angles serve for the attachment of the de- pressor muscles. The outside is regularly ridged transversely when unworn and has one or more shallow radial impressed grooves. The tergum has a bisinuate scutal border; basal margin formed of two subequal arcs, the posterior one occupied by the deeply cut lateral depressor muscle crests, which in basal view are seen to be intricately branching and pectinated. The exterior is seal brown, with some lighter rays. The low growth-ridges are worn smooth except along the carinal margin, where they are sharp and Fig. 97.—Chthamalus hkmheli. Napili Harboe, Mali, a, maxilla, h, mandible. C, ELEVENTH SEGMENT OF CIBBUS VI. d, PALPUS. C, END OF THE PENIS. An old individual measures, carinorostral and lateral diameters 75 mm.; height of carina, 41 mm.; length of scutum, 45 mm. Carinorostral diameter, 76; lateral, 64 mm.; height of carina, 49 mm. Labrum has a simply concave edge, not toothed or spinose. The mandible has three strong teeth and a closely pectinated lower X^oint (fig. 97&). The maxilla is very closely set with rather slender spines, not varying much in size on the upper two-thirds, but shorter and nar- rower on the lower third (fig. 97«). The palpi are closely set with rather small spines near the distal end. There is no group of long spines as in the other species (fig. 97^). The cirri are densely pigmented, the pigment in dots, chiefly at the bases of the spines and along the carinal borders of the segments. 4729°—Bull. 93—IG 22. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States Nat
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