Contributions to the Crustacean Fauna of South Africa. 435 



make a near approach to Java, and for the present the species 

 may remain in this genus. 



GEN. IAIS, Bovallius. 



1886. lais, Bovallius, Bib. K. Svenska, Vet. Ak. Handl. vol. 2, 

 No. 15, pp. 4, 50. 



1886. Jacra (part), Beddard, Challenger Rep. vol. 17, p. 19. 



1887. lais (JantJie), Pfeffer, Krebse von Sucl-Georgien, p. 18. 

 1900. ,, Stebbing, Proc. Zool. Soc. Loud. 1900, p. 548. 



IAIS ruBESCENS (Dana). 

 (Plate XXXVII. C.) 



1853. Jaera pubescens, Dana, U.S. Expl. Exp. vol. 13, p. 744, pi. 49, 



figs. 9a-d. 



1900. lais Stebbing, I.e. p. 549, pi. 38 ( ? ). (Synonymy.) 



1904. ,, ,, id. Spolia Zeylanica, vol. 2, pfc. 5, p. 10. 



1909. ,, ,, Chilton, Subantarct. Is. New Zealand, Crust. 



vol. 2, p. 649. 



It appears that the male has so far escaped observation. It does 

 not differ essentially from the female except as regards the mandibles. 

 These have the incisive process very much prolonged, gently curved 

 and tapering gradually to a subacute, entire apex, with a strong 

 seta about half-way along the inner margin, spine-row with 4 spines, 

 molar similar to that of ? but rather weaker, palp as in ? , arising 

 from a short process. 



The lobes of the lower lip are short, almost semicircular, the 

 inner margin straight, the apical angles being internal therefore and 

 not external as in Stehbing's figure. 



First pleopods fused basally, not diverging distally, the outer 

 margins sinuous, rami well developed, oblong with rounded apices, 

 sparsely setulose. 



Second pleopod with peduncle longer than broad, apex subacute, 

 outer ramus arising some little distance from apex, male stylet 

 extending as far as, not beyond, the apex of peduncle. 



Third pleopod similar in both sexes, inner ramus stout, suture 

 between the 2 joints oblique, 2nd joint apically truncate, with 2-4 

 denticles, outer ramus half width of inner, curving inwards, apex 

 pointed, margins setulose, an obscure suture dividing off the 

 distal third. 



Length : 2'5 mm. 



