328 Annals of the South African Museum. 



of the 2nd joint of the 2nd peraeopod, and lastly the plumose 2nd joint 

 of the exopod on the latter peraeopod. 



Another point of interest is the complete absence of a deposit on the 

 pleopods. This is due to their being enclosed in a kind of cavity 

 formed by the folding under of the terminal part of the pleou, similar 

 to what has happened in the Braclnjurn. This cavity is protected 

 laterally by the fringe on the pleon segments themselves and by the 

 development of plumose setae on both margins of the 2nd joint of 

 peraeopods 5-7. The recurved uropods follow the dorsal curve of the 

 pleon. The animal bears a strong likeness to an Amphipod of the 

 genus Corophium. 



GEN. SPHYRAPUS N. & S. 



1886. tij>li>/nn>ii$ Norman & Stebbing, Tr. Linn. Soc. Lond. vol. 12, 



p. 97. 

 1896. G. 0. Sars, Crust. Norw. vol. 2, p. 8. 



SPHYKAPUS MALLEOLUS N. & S. 



1886. Spliyrapus malleolus Norman & Stebbiug, I.e. p. 98, pi. 22, 



tigs. 2, 3. 

 1896. Bonnier, Ann. Univ. Lyons, vol. 26, 



p. 665, pi. 31, fig. 1. 

 1905. Richardson, Bull. U.S. Nat. Mus. no. 54, 



p. 52, fig. 40. 



The specimens call for no remarks on structure, since they agree, 

 even to details, with the original description and figures. 



The occurrence of this species in deep water off the Cape is another 

 example of so-called " Bipolarity /" Other instances among the Isopoda 

 are Aey ii/nnufi/itlniJina Johiist. and Pseudanthura lateralis Richards 

 (infra), and among the Amphipoda E^ilincrn cornigera and Sybils 

 <j!mardi. It is nearly certain that this phenomenon is due in large 

 measure to the incompleteness of our oceanographical investigations 

 and will tend to disappear as these become more extensive and 

 complete. 



Length: 4mm., 9 4'5 mm.; breadth: $ 1 mm., $ 1 mm. 



Colour ; In spirit pinkish white, surface glistening. 



Locality: Cape Point N. 89 E., distant 36 miles. 700 fathoms. 

 2 J rf , 1 nouovigerous 9 . s.s. " Pieter Fauiv." 20/8/03. (S.A.M. 

 No. A4135.) 



Geogr. Distribution : S. of Cape Farewell, Greenland, 1450 fathoms 

 (Norm. & Stebb.). 



