REPORT ON THE AMPHIPODA. 1431 



Phrosina australis, n. sp. 



The only differences of importance that I can discover between this species and 

 Phrosina semilunata, Risso, refer to the uropods, of which the first and second pairs, 

 instead of having broadly rounded terminations, are distinctly narrowed and acute or 

 nearly so ; the telson also is less rounded apically than in the other species ; the rami 

 of the pleopods have seven or eight joints. The fourth segment of the pleon has the 

 hind margin straight across the back. In the first and second perseopods, the denticula- 

 tion of the distal margin is less marked than in the other species, and in the fourth 

 perasopods this margin has three teeth in the front part, that nearest the fifth joint 

 being the broadest of the three. 



Length, rather under a quarter of an inch. 



Locality. — Station 164d, June 14, 1874; east of Australia; lat. 34° 3' S., long. 

 152° 20' E.; surface ; surface temperature, 67°"5. One specimen. 



Remarks. — The specific name refers to the capture of the species far in the south. 

 The difference in the uropods is rather striking as combined with the very close 

 resemblance in other parts between this and the type species. 



The following list will show the distribution of the genus Phrosina as illustrated by 

 the Challenger specimens : — 



1. June 18-19, 1873, east of Bermuda; lat. 35° 18 N., long. 51° 42' W.; surface. 

 One specimen. 



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

 One specimen. 



3. Station 34G, April 6, 1876; Tropical Atlantic; lat. 2° 42' S., long. 14° 41' W.; 

 surface. One specimen. 



4. Station 164D, June 14, 1874 ; east of Australia; lat. 34° 3' S., long. 152° 20' E.; 

 surface. One specimen. 



5. Station 201, October 26, 1874; off Samboangan ; lat. 7° 3' N., long. 121° 48' E. 

 One specimen, a fifth of an inch long, mounted in Canada balsam. 



6. April 3, 1875, North Pacific, south of Japan ; lat. 24° 49' N., long. 138° 34' E. 

 One specimen. 



7. Station 230, April 5, 1875 ; North Pacific, south of Japan; lat. 26° 29' N., long. 

 137° 57' E.; surface. Four specimens. 



This range is extended by specimens which have been reported from the Mediter- 

 ranean and the Cape of Good Hope, and by Phrosina longispina, Spence Bate, " found in 

 the stomach of a shark, lat, 26° 27' S., long. 90° W." It is probably under some mis- 

 apprehension that Bovallius assigns the last-named species to the " South Atlantic." 



