. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 245 The second cirri have 10 and 7 segments, anterior rannis longer by about three segments. The segments do not protrude. Third cirri simihir to the second, with slightly unequal rami of 11 and 10 segments. The fourth cirri are longer (fig. 80^). The pedicel is rather long. The anterior ramus has recurved teeth on the anterior margins of the first to tenth segments, varying in number and size as shown in the figures. There are also several smaller, erect spinules near the an- terior distal part of each toothed segment
. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 245 The second cirri have 10 and 7 segments, anterior rannis longer by about three segments. The segments do not protrude. Third cirri simihir to the second, with slightly unequal rami of 11 and 10 segments. The fourth cirri are longer (fig. 80^). The pedicel is rather long. The anterior ramus has recurved teeth on the anterior margins of the first to tenth segments, varying in number and size as shown in the figures. There are also several smaller, erect spinules near the an- terior distal part of each toothed segment. These segments bear two or three spines, which arise behind the teeth or toward the inner face of the cirrus, except the upper one, which stands on the front Fig. -ACASTA CYATHUS FROM ALBATROSS STATION 2146. C, MANDIBLE. Q, LABROM. b, MAXILLA. Beyond the tenth segment the anterior ramus is similar to the pos- terior, Avhich has no teetli, the segments bearing three to four pairs of spines. The individual from near the Dry Tortugas (figs. 80e to li) differs from the preceding by Inning the segments of the fourth to sixth cirri longer, about twice as long as wide. The teeth are not so large, and there are three instead of two on part of the segments. There is also some difference in the number of erect spinules, as shown in the figures, although the general arrangement IS not very different. The sixteenth and last toothed segment of the anterior ramus is drawn in figure 80c. The largest individuals seen are from St. Thomas, collected by Robert Swift, in the museum of the Academy of National Sciences. Greatest diameter 12 mm., height mm. The color is pale pink. The hollow spines are often forked at the end. 4729°—Bull. 93—16 17. 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 St
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