. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 200 BULLETIN OF THE BUREAU OF FISHERIES. beveled margin of the lower half of the occludent border there is an inflected sharp Toward the basal margin the inner surface is longitudinally grooved. The tergum (pi. vin, fig. 5, Gi has a long purple beak, one-fourth the length of the whole plate. The outer surface is worn above, but the lower part is cancellated like the scutum. The longitudinal .sulcus is closed by infolding of its sides. The spur is long, rounded at the end, and sit
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 200 BULLETIN OF THE BUREAU OF FISHERIES. beveled margin of the lower half of the occludent border there is an inflected sharp Toward the basal margin the inner surface is longitudinally grooved. The tergum (pi. vin, fig. 5, Gi has a long purple beak, one-fourth the length of the whole plate. The outer surface is worn above, but the lower part is cancellated like the scutum. The longitudinal .sulcus is closed by infolding of its sides. The spur is long, rounded at the end, and situated at less than its own width from the scutal margin. On both sides the basal margins slope steeply to the spur. The interior is yellow, with a long purple spot in the middle. Articular ridge short, suberect and thin. A low, flat, gently arcuate rib runs from the spur to the apical beak, in which a fine cavity penetrates from the apex of the purple spot. The depressor crests are few and not very strong. Basal length of the walls 70 mm., height 75 mm. Length of the scutum 31 mm., breadth mm. Length of tergum with spur 32 mm., breadth 12 mm. The mandible (fig. 2. b, left side) has four small teeth, the last adjacent to several low obtuse denticles at the lower end. The end of the maxilla is sigmoid, the upper half excavated, the lower convex. It is armed with numerous stout and slender spines (fig. 2, c, right Bide). The first pair of cirri has wide rami like moth antennae, the posterior one three-fourths as long as the anterior, with greatly protruding segments, about 22 in number. The segments of the anterior ramus are less protruding. 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 Fish Commission. Washington, The Commission, Govt. Print. Off
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