KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 295 



Syn. 1852. Themisto antarctica, J. P. DANA. United States Exploring- Expe- 



dition. Crustacea. Vol. 2, p. 

 1005, pi. 69, tig. 1. 

 » » » Spence Bate. 1862. Catal. Amph. Crust. Brit. Mu- 



seum, p. 312, pi. 50, fig. 8. 

 » » » G. M. Thomson. 1879. »New Zealand Crustacea'). Trans. 



and Proc. of the New Zealand 

 Institute. Vol. 11, p. 243, 

 pi. 10 D, fig. 2—3. 

 Euthemisto antarctica, » C. Bovallius. 1887. "Systematical list of the Amphi- 



poda Hyperiidea». Bin. t. K. 

 Sv. Vet. Ak. Handl. Bd. 11. 

 N:o 16, p. 22. 

 » » » » 1887 . "Arctic and Antarctic H_yperids». 



Vega-Exp. Vetensk. Iakttagel- 

 ser. Bd. 4, p. 570. 

 1862. Themisto Gverinii, SPENCE BATE. Catal. Amph. Crust. Brit. Mu- 



seum, p. 313, pi. 50, fig. 9. 

 1888. Euthemisto Gaudichaudii, (E. E. GUERIN.) Til. Stebbing. "Report on the Amphipoda». 



Voy. of H. M. S. Challenger. 

 Zoology. Vol. 29, p. 1410, 

 pi. 172 and 173. 



Euthemisto antarctica, Dana, and E. Gaudichaudii, Guerin, are closely allied, 

 and are less easily distinguished from one another than the two Northern forms; the best 

 distinguishing mark is however the relation between the length of the first and second 

 pairs of uropoda. 



The original description given by Dana in 1852 runs: 



"Superior antennas longer than the head, nearly naked, three-jointed, two basal joints small, 

 the third long and acuminate; inferior pair longer and very slender, base four-jointed, third and fourth 

 joints slender, fourth longer, flagellum a little longer than fourth joint. Third and fourth pairs 

 of feet prehensile, hand broad, triangulato-subovate, finger slender, longer than hand, claw nearly 

 straight. Fifth pair rather stout, coxa large, next two joints short, fourth long, stout, fifth longer 

 than three preceding together. Sixth and seventh subequal and slender. Caudal stylets very 

 long. — — — Thoracic segments seven, subequal. Fifth abdominal segment very short. Last 

 segment quite small, triangular. Terminal caudal stylets longest, nearly as long as abdomen, 

 first pair longer than second, but not extending as far back as third pair. Antennary area rather 

 small, broader above, occupies more than half the height of the head, and less than half its 

 width. Two anterior pairs of legs are cylindrical towards apex and pointed, fifth joint longer 

 than fourth, and fourth longer than third; at apex a few long setas. The hand in third and 

 fourth pairs has a few very short seta? on the palm, and the finger one or two minute seta? on 

 the inner side. The long tarsus or finger of fifth pair appeared to have a minute claw at apex. 

 The sixth and seventh pairs are rather long and nearly equal; there are several short spines on 

 inner margin of fourth joint, besides a few on the other joints. The third pair of abdominal 

 legs is smaller than the preceding." 



The description of Themisto antarctica given by Spence Bate in 1862 agrees to- 

 lerably well with that of Dana, and as the characteristics respecting the uropoda positively 

 agree I think that Spence Batlo was right in his determination. I quote only the 

 last passages of his description: 



