. Bulletin - United States National Museum. Science. POLYCHAETE WORMS, PART 1 199 to blackish. Preaciciilar setae short, dark brown, barred; postacicular setae relatively short, deep yellow, minutely serrated. Tips of acicula may be covered with chitinous plates. Ventral cirri short, flattened, triangular to conical. Branchiae begin on setigers 6-8, small anteri- orly, becoming larger, then in the posterior half becoming smaller where they may be equal in size to the dorsal cirri, absent from the last 12 or so segments; where best developed, they are large, recurved, sickle-shaped. Dorsal cirr
. Bulletin - United States National Museum. Science. POLYCHAETE WORMS, PART 1 199 to blackish. Preaciciilar setae short, dark brown, barred; postacicular setae relatively short, deep yellow, minutely serrated. Tips of acicula may be covered with chitinous plates. Ventral cirri short, flattened, triangular to conical. Branchiae begin on setigers 6-8, small anteri- orly, becoming larger, then in the posterior half becoming smaller where they may be equal in size to the dorsal cirri, absent from the last 12 or so segments; where best developed, they are large, recurved, sickle-shaped. Dorsal cirri small anteriorly, becoming large, flattened, triangular, then smaller, digitiform in the posterior region. Proboscis (fig. 496) with 10 pairs bifid terminal papillae and 20-22 longitudinal rows of subterminal papillae, 1-6 per row. Papillae very small. Large middorsal and smaller midventral papilla Figure 50.—Nephtyidae, a-b, Nephtys bucera: a, ventral view anterior end; b, branchia and branchial or dorsal cirrus from middle parapodium. c~f, Nephtys picta: c, ventral view anterior end; d, branchia and branchial or dorsal cirrus from middle parapodium; e, spinous postacicular notoseta from middle parapodium;/, part of same, 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
