. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 381 wall, its lower margin not in the least overhanging. The interior is not in the least grooved below the sheath, and at the basal edge the compartments are very narrowly inflexed or have a slight rim around the membranous basis. The carina is longer than the rostrum, longer than wide, triangular in outline. The carinolateral compartments have very narioAv, band- like parietes, hardly one-fourth as wide as tliat of the rostrum. The rostrum is normally about as high as wide, and triangular in shape. The base is modifi
. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 381 wall, its lower margin not in the least overhanging. The interior is not in the least grooved below the sheath, and at the basal edge the compartments are very narrowly inflexed or have a slight rim around the membranous basis. The carina is longer than the rostrum, longer than wide, triangular in outline. The carinolateral compartments have very narioAv, band- like parietes, hardly one-fourth as wide as tliat of the rostrum. The rostrum is normally about as high as wide, and triangular in shape. The base is modified in shape by the cylindrical cortd, which serves as suppoi-t, and upon Avhich the barnacle is seated with the carino-. Fic, 98.—ITexulasxia americandm. a, intermediate segments ok cikrcs vi. i, first CIRRUS. C, mandible. (1, MAXILLA. rostral axis transverse to the long axis of the coral-branch in all but one of tlie specimens seen. Greatest carinorostral diameter, 17 mm.; basal diameter at riglit angles to preceding, 18 mm.; height of carina, 21 mm. The scutum is at least two and one-half times as long as wide, sculptured with regular growth-ridges, which unite by pairs to form oblique teeth along the occludent edge. There are no longitudinal strioe. Inside there is a very low, rounded, rather massive articular ridge, and a deep, very narrow articular furrow, but no adductor ridge whatever. There is a small pit with a c()U])le of short crests for the lateral depressor muscle. The occludent border of the plate is bent up along its lower 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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