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Show 554 REV. T. R. R. STEBBING ON CRUSTACEANS [May 22, 1847. Sphceroma lanceolatum, White, List Crustacea Brit. p. 102. 1853. Spheroma gigas, Dana, U.S. Expl. Exp. vol. xiii., Crust. pt. ii. p. 775, pi. 52. fig. 1. 1853. Spheroma lanceolata, Dana, loc. cit. p. 775, pi. 52. figs. 1 a-f. 1871. Sphceroma lanceolatum, Cunningham, Tr. Linn. Soc. Lond. vol. xxvii. p. 499. 1876. Sphceroma gigas, Miers, Catal. Crust. N e w Zealand, p. 110. 1876. Sphceroma lanceolata, Miers. loc. cit. p. 111. 1881. Sphceroma gigas, Miers, Pr. Zool. Soc. Lond. p. 79. 1882. Spliceroma gigas, Haswell, Catal. Australian Crust, p. 287. 1884. Sphceroma gigas, Studer, Ak. Wiss. Berlin, Isopoden ' Gazelle,' p. 17. 1884. Sphceroma lanceolatum, Studer, loc. cit. p. 18. 1886. Sphceroma gigas, Beddard,' Challenger' Isopoda, Beports, vol. xvii. p. 147. 1893. Sphceroma gigas, G. M . Thomson, P. B. Soc. Tasmania, p. 14. Leach very briefly describes this species as having ''the body smooth; last segment of pleon narrowed to a point, apically rounded; length, an inch ; habitat unknown." Of the only two specimens he had seen, one, given him by Lamarck, was in his own cabinet, the other in the museum of the Linnean Society. The latter is still, I think, where it was seen by Leach, but a dried marine isopod is in the position of Tithonus : its immortality does not carry with it the gift of perpetual youth. Desmarest copies the brief description by Leach. Milne-Ed wards adds that the rounded apical angle of the telsou extends beyond ("depasse notablement") the inner lamina of the uropods, and that the outer lamina or ramus is long, obtuse, not serrate. White in 1843 describes his var. lanceolata thus : - " Body smooth ; last joint of the abdomen considerably arched above, and having near the base a slight elevation grooved in the middle; the last joint is also iu most of tbe specimens considerably pointed, and extends very slightly beyond the extremity of the inner plate of the last false legs; the outer plate of these appendices is narrow and lanceolate ; both of the plates are minutely punctured with black." The habitat is the Falkland Islands ; the size reaches three-fourths of an inch to a whole inch in length; and it is admitted that " this species comes very near the S. gigas Leach," "from which it principally differs in the more elongated and narrower outer plate, and in the grooved elevation at the base of the more arched last joint of the abdomen." In 1847 White adopts it as a separate species, but with the synonymy " var. Sph. gigas Leach ? " Dana gives a ventral view of the caudal shield and uropods of "Spheroma gigas" from N e w Zealand. For his specimens he reports surface of body smooth, but with microscopic appearance of granulation, caudal shield evenly convex, sides arcuate (not sinuous), apex rounded, moderately narrow, not quite reached by |