206 Annals of the South African Museum. 



Mandibles, cutting-edge in the left 4-toothed, in the right 3-toothed, 

 secondary cutting-edge 3-toothed, stronger in the left than in the 

 right, spine-row with 7 serrate spines in both mandibles, molar pro- 

 minent, denticulate, with setae on posterior margin. 



First maxilla, outer plate with 10 not very stout, serrate spines, 

 inner plate with 2 long plumose setae. 



Second maxilla as in S. hlrtipes. 



Maxillipeds as in S. hirtipes, but the epipod is symmetrically 

 bevelled off on both inner and outer margins, instead of having an 

 inward sloping apical margin. 



Peraeopods with long scattered setae, uniunguiculate. First 

 peraeopods (gnathopods) rather stouter than the others, 5th joint with 

 two small and indistinct tubercles on anterior margin, 6th joint 

 expanded. Peraeopods 2-7, 5th and 6th joints with 3-4 tubercles on 

 anterior margin. Peraeopods 6 and 7, 6th joint with 2 strongly 

 serrate spine-setae at the apex of inner margin. 



Uropods, peduncle without oblique ridge, ramus not more than 

 one-third length of peduncle, as broad as long, apex transversely 

 truncate, outer angle rounded, 3 long plumose setae at outer apical 

 angle of peduncle. 



Length : 15 mm. ; breadth : 4 mm. 



Colour : In spirit, dull pinkish. 



Locality : 33 3' S. lat. 27 57' E. long. 32 fathoms, s.s. " Pieter 

 Faure." 28/12/98. 



One specimen, apparently an immature ? . (S.A.M, No. A20.) 



FAMILY ASTACILLIDAE. 



To the list of references given by Stebbing : S. Afr. Crust, pt. 4, 

 p. 50, 1908 (Ann. S.A.M. vol. vi. pt. 1), may be added :- 



1911. Arcturidae, Koehler, Bull. Inst. ocean. Monaco, No. 214, 

 p. 1. 



GEN. AECTUEUS, Latreille. 



1829. Arcturus, Latreille, in Cuvier, Eegne Animal, 2nded. iv. p. 139. 

 1886. Beddard, Challenger Eep. vol. 17, p. 85. 

 1893. Stebbing, Hist. Crust, p. 370. 



1904. ,, Whitelegge, Sci. Ees. Exp. " Thetis," pt. 7, p. 406. 



1905. Eichardson, Bull. U.S. Nat. Mus. No. 54, p. 327. 

 1910. id. Proc. U.S. Nat. Mus. vol. 37, p. 97. 



