. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 307 ORIENTAL SPECIES. CHTHAMALUS CHALLENGER! Hoek. Plate 72, figs. l-4a. 1SS3. Chthamdliis chuUcngcri IIoek, ClmUcngcr Reports, Zoologj', vol. 8, p. 165, pi. 13, figs. 35-38. 1911. CIi Ilia null lis challcngcri Hoek, Kruger, Beitriige ziir Cirripe<lioiiCauna Ostasiens, p. 46, pi. 3, fig. 30. Distrihittion.—Japan; Matsushima. The barnacle has rounded ribs, rather strong, ^vhite throughout, not corroded, and smooth inside. The radii are very narrow. Carino- rostral diameter mm. The scutum is lengthened. Articular
. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 307 ORIENTAL SPECIES. CHTHAMALUS CHALLENGER! Hoek. Plate 72, figs. l-4a. 1SS3. Chthamdliis chuUcngcri IIoek, ClmUcngcr Reports, Zoologj', vol. 8, p. 165, pi. 13, figs. 35-38. 1911. CIi Ilia null lis challcngcri Hoek, Kruger, Beitriige ziir Cirripe<lioiiCauna Ostasiens, p. 46, pi. 3, fig. 30. Distrihittion.—Japan; Matsushima. The barnacle has rounded ribs, rather strong, ^vhite throughout, not corroded, and smooth inside. The radii are very narrow. Carino- rostral diameter mm. The scutum is lengthened. Articular ridge prominent, its edge bisinuate, being excavated above, tapering below the median promi-. FlG. 87. CHTHAMALUS CHALLENGEIlIj MaTSUSHIMA. a, MANDIBLE. l), MAXILLA. C, TERMI- NAL SEGMENT OF THE SHORTER UAMUS OF CIRRUS IT. d, SEVENTH SEGMENT OF CIRRUS VI. e, INTERMEDIATE SEGMENT OF CIRRUS VI OF THE VARIETY FROM AYUKAWA, JAPAN. nence. xVdductor muscle pit small and rather deep, with a raised rim forming a strong adductor ridge. Lateral depressor muscle pit is very indistinct. The tergum is wide above, narrow below. Upper free portion con- spicuously laminate. Articular ridge strong, the articular furrow wide. There is no real spur, as the basiscutal angle is termina]. The basal margin is deeply sinuated below the depressor muscle crests, the strongly developed crests being borne on a triangular lobe of the valve, as in many other species. The mandible is of the steUatus form, but the three points at the lower extremity are much more sti'ongly developed and the finely pectinated space above them is shorter (fig. S7a).. 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.
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