56 Annals of the South African Museum. 



Locality. Cape St. Blaize, N. by B. 73 miles ; at a depth of 

 125 fathoms ; bottom, sand and shells. 



The specific name, meaning branch-bearing, from K\acoe, a branch, 

 refers to the peculiar processes on the head and trunk. 



In A. alcicornis Whitelegge describes two prominent spines on the 

 frontal region of the head, each with an accessory spine immediately 

 below, a stoutish bifurcated spine on each side of the first peraeon 

 segment, and four short antler-like spines on each of the second and 

 third segments. Thus the pair of long antlered processes on the 

 back of the head in the South African species are evidently not 

 present in the Australian. In the latter the third joint of the first 

 antennae is only one-third as long as the second ; the maxillipeds 

 have large lanceolate epipods and the first two joints of the palp 

 subequal ; the first gnathopods have the finger curved ; the sixth 

 joint in the first and second perseopods is said to be progressively 

 shorter than that of the second gnathopods, whereas in the African 

 species this joint is as long in the first peraeopods as in the preceding 

 limbs, and the other differences are sufficiently sho'wn by the 

 drawings here given. Whitelegge's specimen, with second antennas 

 wanting, was an adult female, body about 10mm. long. He describes 

 at the same time four other new species of Arcturus from South 

 Australia, three of which also have dentate limbs. 



TRIBE EPICARIDEA. 



1893. Epicaridea, Stebbing, History of Crustacea, p. 392. 



1897. Epicaridea, Hansen, Bulletin Mus. Comp. Zool. Harvard, 



vol. xxxi., p. 111. 



1898. Epicaridea, Sars, Crustacea of Norway, vol. ii., p. 193. 



1905. Epicaridea (or Bopyroidea), H. Kichardson, Bulletin U.S. 



Nat. Mus., No. 54, p. 497. 



1906. " Bopiridi," Nobili, Ace. E. Sci. Torino, vol. xli. (extr.), 



FAMILY BOPYRHXE. 



1893. Bopyridce, Stebbing, History of Crustacea, p. 408. 

 1898. Bopyridce, Sars, Crustacea of Norway, vol. ii., p. 195. 

 1900. Bopyridce, Bonnier, Travaux de la Station zool. de Wimereux, 

 vol. viii., p. 218. 



The name is still elastic. The limits of the family, which have 

 been variously stretched and contracted, approach a settlement in 



