. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 30^ Cirrus ii has seven and six segments. Among the terminal spines of the shorter (posterior) ramus there is one broader hmceoLate spine having two closely toothed edges, but without larger teeth below the serrate portion (fig. 84rt). There are three such spines at the distal end of the longer ramus. Cirri of the third to sixth pairs much longer than those preceding, and bearing five pairs of spines on the median segments (p. 298, fig. 82/).. Fig. 84.—Chthamalus stellatus, Naples, a, tersiinal segment op the shorteu R
. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 30^ Cirrus ii has seven and six segments. Among the terminal spines of the shorter (posterior) ramus there is one broader hmceoLate spine having two closely toothed edges, but without larger teeth below the serrate portion (fig. 84rt). There are three such spines at the distal end of the longer ramus. Cirri of the third to sixth pairs much longer than those preceding, and bearing five pairs of spines on the median segments (p. 298, fig. 82/).. Fig. 84.—Chthamalus stellatus, Naples, a, tersiinal segment op the shorteu RAMUS OF ClUnUS H, SHOWIXG ONE LAXCEOLATE, SERKATE SPINE. Ij, PALPUS. C, MAX- ILLA. (1, MANDIBLE. The penis is much longer than the last cirri. It is slender, closely ringed, and has a delicate pencil of hairs at the end. As this species is the type of the genus, and has been reported from many places all over the world, including our own shores, it has been thought best to give an account of the typical form. Figures 1 to 15 represent topotypes from Naples, which agree fully with Darwin's plate 18, figures la (locality not given) and 1/ (Madeira) ; also with De Alessandri's figures of Italian Pleistocene examples. The opercular valves are highly characteristic. My figure of the entire animal shows only deeply corroded specimens. Small specimens up to 3 mm. diameter, but evidently adult, from Fayal, Azores, growing on Purpura kcemastoTna have 10 to 12 very conspicuous ribs. The opercular valves are thin, but typical in form (pi. 71, figs. -1, 4(2).. 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 National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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