REPORT ON THE AMPHIPODA. 1615 



which appears to be a distinctive character of the female in this genus ; the first 

 three pairs of branchial vesicles, which are wanting in the male, were also here faintly 

 discerned. 



The following table shows the distribution of the Oxycephalidse as illustrated by the 

 Challenger specimens : — 



1. Station 13, March 4, 1873; between Tenerife and St. Thomas; lat. 21° 38' N, 

 long. 44° 39' W.; surface temperature, 72°. (Leptocotis.) 



2. April 29, 1876, North Atlantic; lat. 18° 8' N, long. 30° 5' W.; surface, night; 

 surface temperature, 73°"7. {Oxycephalus.) 



3. April 28, 1876, North Atlantic; lat. 17° 47' N, long. 28° 28' W.; surface; 

 surface temperature, 73° - 5. (Oxyceph edits.) 



4. April 27, 1876, North Atlantic; lat. 17° 18' N., long. 26° 32' W.; surface 

 temperature, 73°"5. {Oxycephahis.) 



5. April 26, 1876, off St. Vincent, Cape Verde Islands ; lat. 16° 49' N, long. 

 25° 14' W.; surface temperature, 73°"2. Four specimens. (Three specimens are 

 probably Oxycephahis clausi, and one probably Oxycephalus porcellus.) 



6. Station 352, April 13, 1876; North Atlantic ; lat. 10° 55' N, long. 17° 46' W.; 

 surface; surface temperature, 77°'7. One specimen {Rhabdosoma brevicaudatum). 



7. Station 104, August 23, 1873; Equatorial Atlantic ; lat. 2° 25' N, long. 20° 1' 

 W.; surface; surface temperature, 78°. {Oxycepliedus clausi.) 



8. Station 106, August 25, 1873; Equatorial Atlantic; lat, 1° 47' N, long. 24° 26' 

 W.; surface to 100 fathoms; surface temperature, 78°'8. One specimen, in Canada 

 balsam {Leptocotis, $, with the upper antennas having only a small upward produced 

 point), and one specimen, in Canada balsam {Lepitocotis, ?). 



9. Station 347, April 7, 1876 ; Equatorial Atlantic; lat. 0° 15' S., long. 14° 25' W.; 

 surface net ; surface temperature, 82°. One specimen {Rhabdosoma arniatum), and one 

 specimen ( Oxycephahis). 



10. Surface, Atlantic. One specimen {Oxycephahis). 



11. " Oxycephahis $, Atlantic, surface." Two separately mounted specimens. 



12. October 5, 1873, South Atlantic; lat. 29° 1' S., long. 28° 59' W.; surface 

 temperature, 66°. " Oxycephalus, ?." 



13. November 10, 1873, Simon's Bay, Cape of Good Hope; " Vibilia and 

 Oxycephalus." The two specimens are mounted in Canada balsam, the "Oxycephalus" 

 evidently belonging to the genus Calamorhynchus. 



14. Station 330, March 8, 1876; South Atlantic; lat. 37° 45' S., long. 33° 0' 

 W.; surface; surface temperature, 64°"2. One specimen {Calamorhynchus rigidus). 



15. " Oxycephalus oceanus, ?," off Kandavu, Fiji Islands. Two specimens in Canada 

 balsam. 



