. Bulletin - United States National Museum. Science. ISOPOD8 OF NORTH AMERICA. 839 also half as long as the fourth; the sixth and sovonth arc slightly shorter than the fifth. There are two long spines on each one of the thoracic segments, one on each side of the median longitudinal line. The lateral parts of the first segments are l)roadly expanded and surround the posterior portion of the head at the sides. The epimera of the , and fourth segments are small, l)ut distinctly separated from the segments; they occup}'the antcro-lateral angles of. Fig. 3tj7.—Arcturus baffini (After G
. Bulletin - United States National Museum. Science. ISOPOD8 OF NORTH AMERICA. 839 also half as long as the fourth; the sixth and sovonth arc slightly shorter than the fifth. There are two long spines on each one of the thoracic segments, one on each side of the median longitudinal line. The lateral parts of the first segments are l)roadly expanded and surround the posterior portion of the head at the sides. The epimera of the , and fourth segments are small, l)ut distinctly separated from the segments; they occup}'the antcro-lateral angles of. Fig. 3tj7.—Arcturus baffini (After G. O. Sars). a, Anterior part of body, with first pair of ANTENNA AND ORAL APPENDAGES VIEWED FROM BELOW, b, ANTENNA. C, BASE OF SECOND ANTENNA. (/, ADVLT FEMALE, FROM ABOVE, r, FIRST LEG. /, SECOND LEG. J7, POSTERIOR PART OF BODY, VIEWED FROJf BELOW (oNE OF OPERCULAR VALVES REMOVED), ll, TWO SENSORY APPENDICES OF FIRST ANTENNA. (, LaBRUM. J, FLAGELU'M OF SECOND ANTENNA, k. MANDIBLES. /, ONE OF ANTERIOR PLEOPODS. Ill, TERMINAL BRANCHES OF OPERCULAR VALVE (INNER SIDE). )i, SEVENTH LEG. o. One of posterior pleopods. p. First maxilla, q. Labium, r, Second maxilla, s, Max- iLLiPED. /, Terminal claw of seventh leg. u, Lateral view. the segments and are not visi])le in a dorsal view. The epimera of the last three s(\onionts are large and also distinctly separated; they project at the sides of the segments, being pi'oduced in long, acute processes, and are conspicuous from a dorsal view. The first two segments of the ahdomen are short, and each is pro- vided with two dorsal spines, one on either side of the median longi-. 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, [et
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