THE AMPHIPODA. 25 



century. Moreover, in both these species there is much less disparity of length hetween 

 the third and fourth perseopods than that which is indicated by Fabricius. The still 

 obscure and unplaced Scina longipes (Dana), -with its acutely-produced head-front, does 

 not come into competition with any known form. 



A male specimen from Station 31 h measured 22 mm. from apex of first antenna to 

 extremity of third uropod ; in another the length from front of head to end of uropod 

 was 13 mm., the first antennae being 875 mm. long and the first uropods 3'75 mm. 



Occurrences : 33 «. fathoms. 1 specimen, <3 . 



34 a. 25 to fathoms. 2 specimens. 



30 I. 50 to fathoms. 1 specimen, d . 



31 b. 50 to fathoms. 9 specimens, of which 6 d . 

 34 c. 75 to fathoms. 1 specimen. 



35.1". 100 to fathoms. 1 specimen. 



7. Scina cedicakpus, Stebbing. 



1895. Scina cedicarpus, Stebbing, Trans. Zool. Soc. London, vol. xiii. pt. 10, p. 356, pi. 52 b. 



This is an exceedingly transparent little species, and I have not been able to determine 

 whether the thin pellucid integument shows any trace of a medio-dorsal carina. The 

 specific name has not proved very appropriate, since the " swollen carpus " is still more 

 conspicuous in the fifth perseopods of S. Lamperti, Vosseler, and elsewhere. 



Occurrences : 32 d. 100 to fathoms. 1 specimen, <s juv. 



36/". 150 to fathoms. 2 specimens, 1 $ , 1 d not fully mature. 



8. Scina margin ata (Bovallius). 



1885. Tyro marginata, Bovallius, Bihang t. K. Svenska Vet.-Akad. Handl. Bd. x. No. 14, p. 15. 



1887. Tyro marginata, Bovallius, K. Sv. Vet.-Akad. Handl. Bd. xxi. No. 5, p. 21, pi. 3. figs. 18-33. 



1888. /Scina marginata, Stebbing, 'Challenger' Amphipoda, Reports, vol. xxix. p. 1272. 



1889. Fortunata lepisma, ? , Chun, Math. u. Naturw. Mittheilungen Ak. Berlin, Bd. xlv. p. 533 



(343), pi. 3. fig. 8. 

 1889. Scina lepisma, Chun, Zoologischer Anzeiger, Jahrg. xii. No. 308, p. 289. 



1895. Scina marginata, Stebbing, Trans. Zool. Soc. London, vol. xiii. pt. 10, p. 351. 



1896. Scina marginata, Garbowski, Denkschr. k. Akad. Wien, Bd. Ixiii. p. 100 (64), pi. 2, pi. 3. 



figs. 17, 18. 



1900. Scina marginata, Chevreux, Amphipodes de I'Hirondelle, p. 122, pi. 14. fig. 8, pi. 15. fig. 1. 



1901. Scina marginata, Vosseler, Amphipoden der Plankton-Exp. p. 110. 



Dr. Garbowski makes Scina ensicorne, Prestandrea, 1833, a synonym of this species, 

 without, however, restoring Prestandrea's specific name. But the identification cannot 

 easily be maintained, for whereas Bovallius says of his species, " the body is not carinate," 

 Prestandrea says just as expressly that the body of S. ensicorne is dorsally carinate. He 

 further states that the body is 5 Unes long and the superior antennae 3^ lines. 

 This amounts to a total length of more than 17 mm., while of S. marginata the 

 total length is given by Bovallius at 6 mm., and Vosseler expresses surprise at finding 

 specimens 8 mm. long. By the sharply-produced anterior apices of the gnathopods 



