554 REV. T. R. R. STEB13ING ON CRUSTACEANS [May 22, 



1847. Sphnroma lanceolatum, White, List Crustacea Brit. Mus. 

 p. 102. 



1853. Spheroma gigas, Dana, U.S. Expl. Exp. vol. xiii., Crust, 

 pt. ii. p. 775, pi. 52. tig. 1. 



1853. Spheroma lanceolata, Dana, loc. cit. p. 775, pi. 52. figs. 1 a—f. 



1871. Si>haroma lanceolatum, Cunningham, Tr. Linn. Sue. Lond. 

 vol. xxvii. p. 499. 



1876. Sphairoma gigas, Miers, Catal. Crust. New Zealand, p. 110. 



1876. Spheroma lanceolata, Miers. loc. cit. p. 111. 



1881. SpJuvroma gigas, Miers, Pr. Zool. Soc. Loud. p. 79. 



1882. Splueroma gigas, Haswell, Catal. Australian Crust, p. 287. 

 1884. SpJuvroma gigas, Studer, Ak. Wiss. Berlin, Isopoden 



' Gazelle,' p. 17. 



1884. Sphmroma lanceolalum , Studer, loc. cit. p. 18. 



1886. Sphceroma gigas, Beddard, ' Challenger ' Isopoda, Reports, 

 vol. xvii. p. 147. 



1893. Sphceroma gigas, Gr. 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, apical ly 

 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, 1 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 telson 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 in most of the 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 New 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 



