. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 93 ing. Spur sliort, its \^'idlll over one-tliird that of the base; crests for depressor nuiscles sirongly developed, projecting below the basal margin. The labrum has tlu-ee teeth on each side, one witliin the notch (fig. 19/). Labral palpi have two rows of spines, one of numerous small ones, the other of long spines; also the usual dense terminal covering of spines and bristles (fig. Ide). The mandible has the two lower teeth short and blunt. (Fig. 19c.) Maxilla vdth a nearly straight edge, and five spines between th
. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 93 ing. Spur sliort, its \^'idlll over one-tliird that of the base; crests for depressor nuiscles sirongly developed, projecting below the basal margin. The labrum has tlu-ee teeth on each side, one witliin the notch (fig. 19/). Labral palpi have two rows of spines, one of numerous small ones, the other of long spines; also the usual dense terminal covering of spines and bristles (fig. Ide). The mandible has the two lower teeth short and blunt. (Fig. 19c.) Maxilla vdth a nearly straight edge, and five spines between the upper and lower pairs of large spines (fig. 19&). First ciiTus of 18 and 12 segments, tlie posterior ramus two-tliirds the length of the anterior, and having strongly protuberant Fio. 19.—Balanus AMPniTRiTE im'Eus, Marco, FLOKroA. a, Segment op cirrus m. b, maxilla. c, mandible, d, intermediate segment of cirrus VI. e, palpus. /, labrum. Cirrus ii of 13 and 11 segments, strongly protuberant, the posterior ramus three-fourlhs as long as the anterior. Cirrus iii with the anterior, outward part of the lower nine segments thickly set with short, conic, decuiwcd teeth (fig. 19a); the inner faces of these seg- ments havuig long spines, not shown in the figure. The posterior margins of the segments are also shortly spinose. Tlie outer ramus is two or three segments lons^er than the inner. The succeeding cini are much alike. Cirrus vi has 28 segments bearing five pairs of spines, a few median segments having a minute sixth pair (fig. 19(Z). The above description is from specimens from Marco, Florida (pi. 19, figs. 2-2e). Tlie definition of subspecies of B. amj)Mtnte is a very intricate problem, domanfling more time and material than I can connnand,. 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
Size: 1860px × 1344px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
