. Bulletin - United States National Museum. Science. 74 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. The first segment of the thorax is 2^ mm. lono; the second and third are subequal and each is 3 mm. in length; the fourth segment is 4 mm. long; the fifth segment is 3 mm. long; the sixth is l2i mm.; the seventh is 1 mm. in length. The segments are long and narrow and have no epimera separated off. The second and third segments have each at the anterior end two small tubercles, one on either side of the median line. The fourth, fifth, and sixth segments have each a small depression at the anteri
. Bulletin - United States National Museum. Science. 74 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. The first segment of the thorax is 2^ mm. lono; the second and third are subequal and each is 3 mm. in length; the fourth segment is 4 mm. long; the fifth segment is 3 mm. long; the sixth is l2i mm.; the seventh is 1 mm. in length. The segments are long and narrow and have no epimera separated off. The second and third segments have each at the anterior end two small tubercles, one on either side of the median line. The fourth, fifth, and sixth segments have each a small depression at the anterior end in the median line. The abdomen is short, l)eing only 4 mm. in length, or less than one- sixth the entire length of the body. The first six segments are indis- tinctly defined, and are more or less fused in the median dorsal line. The seventh and last segment or telson is triangular in shape with apex acute. The peduncle of the uropoda is broad and extends two-thirds the length of the terminal abdominal segment. The inner lateral branch is small and placed at the posterior end of the peduncle and extends the remaining third of the length of the terminal abdominal segment, reaching the extremity of that segment. The outer or supe- rior branch is dorsally placed and arches over the telson, meeting the branch of the opposite side in the median dorsal line; it is about twice as broad as long and is posteriorly truncate. The fii'st three ]5airs of legs are prehensile, the first pair being much the larger and stouter. The four remaining pairs are ambulatory. CALATHURA CRENULATA Richardson. Calaihnrn cremtlata Richardson, Proe. U. S. Nat. Mus., XXIII, 1901, pp. 509-510. Zocalitu-s.—Between Nassau and Andros Island, Bahamas; Cape Catoche, Yucatan. Depth.—21 fathoms. Found in gulf weed. Head half as long as first thoracic segment, frontal margin with small median point and prominent lat- eral angles. Eyes large, distinct, and ver}^ black. First pair of antennsie more than twi
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