South African Crustacea. 53 



A. furcatus, Studer, in which, as already explained, the marsupium 

 is so constituted. 



The species A. myops, Beddard, with eyes that appear to be sight- 

 less, and A. oculatus, Beddard, with eyes that are pedunculate, though 

 the stalks are unjointed, in these respects stand apart from the rest 

 of the group. Arcturus longicornis, Haswell, supposed to come from 

 Tasmania, has a preoccupied name, and the same author's Arcturus 

 brevicornis, from Australia, appears to be awaiting closer identifi- 

 cation. 



The species referred or referable to Antarcturus appear to be the 

 following : A. coppingeri, Miers, 1881, A. furcatus, Studer, 1884 (1882), 

 A. glacialis, A. spinosus, A. anna, A. cornutus, A. spinifrons, A. pur- 

 piireus, A. brunneus, A. abi/ssicola, A. myops, A. studeri, A. oculatus, 

 A. americanus, A. stebbingi, all these thirteen instituted by Beddard 

 in 1886, A.tenuisrjinis and A. multispinis, both established by Benedict 

 in 1898, A. patagonicus and A. kophameli by Axel Ohlin in 1901, A. 

 caribbcBiis, Eichardson, 1901, A. oryx, zur Strassen, 1902, A. polaris, 

 A. adareanus, and A. franklini, described by T. V. Hodgson in 1902, 

 A. siniplicissimus, A. dentatus, A. alcicornis, A.nodosus, A. serrulatus, 

 published by Whitelegge in 1904, with A. kladophoros about to be 

 described. To this formidable list should probably be added A. flori- 

 danus, Eichardson, 1900, but, as this species was taken at Fernandina 

 in Florida, above 30 North latitude, it far invades the zone which 

 zur Strassen supposed to be devoid of Arcturi in the unrestricted 

 sense of the term. 



ANTAKCTUBUS KLADOPHOROS, n. sp. 

 Plate XXXII. 



The species is not more spinose than several other members of the 

 genus, some of which much surpass it in the length and strength of 

 the spines they display. But none hitherto described have spines of 

 the peculiar branching character here found, except A. alcicornis, 

 Whitelegge, 1904, which, however, otherwise differs from the present 

 species in several respects. 



The head is squarely excavate in front, each of the lateral lobes 

 carrying three or four small spines in advance of the dark red promi- 

 nent facetted eyes, between which rise two simple and two rnultifid 

 spines, while from the rear rise two long processes, blunt at the apex 

 and branching into two spines and two blunt processes. The peraeon 

 segments increase in width to the third and in length to the fourth, 

 this last being twice as long as the third, but tapering backwards. 



