. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 335 joints; the posterior thoracic appendages are smooth and devoid of any such spines. ''The uropoda are covered witli numerous minute graiuilations but bear no ;—Beduaih)." ARCTURUS CARIBBi^US Richardson. Arctarns carihhuux Ri('H.\iU)sox, Proc. U. S. Nat. Mas., XXII1, IHOl, ](i). 546-547. Local/ty.—Near Aves Island. Caribbean Sea. Depth.—(Sm fathoms. Head with a deep excavation on the anterior margin, on either side of which the antero-lateral margins are produced, each bearing a short spine at th
. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 335 joints; the posterior thoracic appendages are smooth and devoid of any such spines. ''The uropoda are covered witli numerous minute graiuilations but bear no ;—Beduaih)." ARCTURUS CARIBBi^US Richardson. Arctarns carihhuux Ri('H.\iU)sox, Proc. U. S. Nat. Mas., XXII1, IHOl, ](i). 546-547. Local/ty.—Near Aves Island. Caribbean Sea. Depth.—(Sm fathoms. Head with a deep excavation on the anterior margin, on either side of which the antero-lateral margins are produced, each bearing a short spine at the outer angle. Tw^o long- spines are situated on the anterior portion of the head, between the- eyes. The first pair of antennte, con- sisting of four joints, reach two-thirds of the length of the third joint of the second pair of antenna^. The first joint of the second pair of antenna? is short and unarmed; the second joint is armed with a small spine at the base on the outer margin, and a large spine on the upper lateral margin; the third joint is about three times as long as the second joint, and is armed with two long spines at the upper end; the fourth joint is about twice as long as the third joint, and is armed with a single spine at the upper end; the fifth joint is somewhat longer than the fourth and is unarmed; the flagellum is long and consists of ten joints. The first, second, third, and fifth thoracic segments have each two long projecting spines, one on either side of the median dorsal line. The fourth, sixth, and seventh segments are with- out these spines. The first segment has three spines, one large central spine and two small spines on each antero-latoral margin. All the other thoracic segments have one long spine on each lateral margin. «Challenger Report, XVII, 1886, pp. Fig. 365.—ARCTURUS Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
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