258 Southern Cross. 



its inner margin. This last joint is more setose than the others. 

 The femur is the stoutest joint of the limb, and is longer than the 

 three coxae together. On its inner margin the setae are short, but 

 on the outer they almost amount to spines, especially at the 

 extremity. 



Of the two tarsi, the proximal is both longer and stouter, both 

 exceed the femur in length, setose on the inner margin, the outer is 

 more thickly covered and the setae are almost in the nature of long 

 spines. The distal tibia bears three spines at its extremity ; of these 

 the middle one is much shorter than the other two. The tarsus and 

 propos together are a little shorter than the second tibia, they are 

 slightly curved and tapering. The latter bears a long terminal claw 

 with a single minute accessory. The tail is an elongate ovoid. 



A very large number of individuals of this species were taken off 

 Cape Adare at various dates and at depths varying between 20 and 

 26 fathoms. Almost all were in an exceedingly dirty condition, 

 due to a thick growth of diatoms of the genus Triceratium or 

 an ally, and other vegetable matter in a more or less decomposed 

 state. This foreign matter is very adherent and it is almost 

 impossible to clean satisfactorily many of them. It gives the 

 animal quite a woolly appearance to unassisted vision. Many 

 specimens, which apparently have recently moulted are quite light- 

 coloured and have a more ^' refined " appearance, being cleaner, and 

 the spines and setae are much sharper. 



EEFEEENCES. 



1. Batk, C. Spence. Eeport on the Crustacea Macrura collected by H.M.S. 



' Challaiger ' during the years 1873-76. 



H.M.S. 'C'/ia?Ze«(/er'Eeports. Vol. 24, Zoology. 1888. 



2. Beddard, F. E. Eeport on the Crustacea Isopoda collected by H.M.S. 



' Challeriqcr' during the years 1873-75. Part 11. 

 RM.a.''^ Challenger ' lle^ovts. Vol. 17, Geology. 1«86. 



3. Benedict, J. E. The Arcturidae in the U.S. National Museum. 



Proc. Biol. Soc, Washington. Vol. 12, pp. 41-55. 1898. 



4. Codtieke, H. Note preliminaire sur les Crustaces decapodes provenant de 



I'expedition antarctique beige. 



C. E. Acad., Paris. Vol. 130, pp. 1640-1643. 1900. 



5. Cunningham, E. 0. Notes on the Eeptiles, Amphibia, Fishes, Mollusca and 



Crustacea obtained during the voyage of H.M.S. '■Nassau' in the years 



18(i6-69. 



Trans. Linn. Soc, London. Vol. 27, pp. 4G5-502. 1871. 



