CEUSTACBANS FROM THE TROPICAL ATLANTIC. 365 



SciNA CORNIGERA (Milne-Edwards). 



1830. Hyperia cornigera, Milne-Edwards, Ann. des Sci. Nat. t. xx. p. 387. 



1840. Tyro cornigera, Milne-Edwards, Hist. Nat. des Crustaces, t. iii. p. 80. 



1885. „ sarsii, Bovallius, Some forgotten Genera of Amphipoda, p. 15, figs. 3, 3 a. 



1887. „ sarsi, Bovailius, Contributions to a Monograph of the Amph. Hyperiidea, p. 9, pi. 1. 



figs. 1-17, pi. 2. figs. 1-10. 



1888. Scina cornigera, Stebbing, 'Challenger' Amphipoda, p. 1273, pi. 146. 



The identity of Ti/ro sarsii, Bovallius, with Tyro cornigera, Milne-Edwards, cannot 

 be insisted on as more than probable. If the later name is upheld, the earlier one 

 might as well be cancelled. 



A specimen more than half an inch in length was obtained by the ' Buccaneer ' near 

 the surface after dark, in the Atlantic, at lat. 5° 88' N., long. 14° 20' W., together with 

 two other specimens of the same species. 



Scina atlantica (Bovallius). 



1885. Tyro atlantica, Bovallius, Some forgotten Genera of the Amphipoda, p. 14. 



1887. „ „ Bovallius, Contributions to a Monograph of the Amph. Hyperiidea, p. 13, 



pi. 2. figs. 11-18. 



1888. Scina atlantica, Stebbing, ' Challenger ' Amphipoda, p. 558. 



1889. „ „ Chun, Zool. Anzeiger, Jahrg. xii. no. 308, p. 289. 



A specimen, apparently belonging to this species, was taken in the daytime from a 

 depth of 100 fathoms, in the Atlantic, at lat. 7° 11' N., long. 15° 54' W. It measured 

 fully a fifth of an inch. The first antennae are unusually wide apart. The third 

 perseopods in this specimen are unsymmetrical, so that a distinct species might be 

 made out of each longitudinal half of the animal. The perseopod on the right side 

 has the full number of joints, but all, except the third, are dwarfed. The preceding 

 limbs are afiected in a similar manner, but to a smaller extent. 



Scina pacifica (Bovallius). 



1887. Tyro pacifica, Bovallius, Systematical List of the Amph. Hyperiidea, p. 4. 



1887. „ „ Bovallius, Contributions to a Monograph of the Amph. Hyperiidea, p. 25, 



pi. 3. figs. 10-17. 



1888. Scina pacifica, Stebbing, ' Challenger' Amphipoda, p. 587. 



The differences between this species and the earlier Tyro tullbergii, Bovallius, 1885, 

 are, as Dr. Bovallius himself remarks, very slight. A specimen, agreeing best with the 

 atlantica form, was taken by the 'Buccaneer' with the tow-net at noon from a depth 

 of 235 fathoms in the Atlantic, in lat. 4° 26' 7" S., long. 10° 18' E. The specimen 

 measured three-twentieths of an inch, including as usual the antennae and uropods. It 

 contained about a dozen relatively large eggs. 



It seems not a little remarkable that the only tweh'e specimens of the genus Scina 

 VOL. XIII. — PAKT X. No. 3. — February, 1895. 3 g 



