216 Annals of the South African Museum. 



which is triangular and has a minute setule on either side of the 

 terminal spine, concealed lobe very small ending in one long seta. 



Length : 5mm. 



Colour : In spirit, whitish. 



Locality : Cape Point NE. by E. 1 E., distant 38| miles. 755 

 fathoms. \$. s.s. " Pieter Faure." 23/6/05. (S.A.M. No. A69.) 



This form seems to require the institution of a new genus, though 

 the absence of the female is greatly to be regretted. 



The composition of the pleon separates Neoarcturus from all the 

 other genera except Arcturopsis, Arcturella and Arcturina; from 

 these it differs in the fourth peraeon segment not being longer than 

 the third, thus resembling Arcturus. The latter, however, has more 

 than four joints in the flagellum of the second antennae, whereas 

 this species has only three. Arcturina is distinguished by the 

 aberrant structure of the 2nd, 3rd and 4th peraeopods and Arc- 

 turopsis by the presence of an appendage on the 3rd (or 5th) 

 peraeon segment in the male. 



Lastly, it approaches Antarcturus in the absence of coupling- 

 hooks on the maxillipeds and the peculiar first pleopods in the 

 male. The shape of the apex of the exopod of the latter in N. oudops 

 can be regarded as an exaggerated and ornate development of that 

 found in A. kladophoros. 



GEN. PLEUEOPKION, zur Strassen. 



1902. Antares, zur Strassen, Zool. Anz. xxv. p. 687 (nom. preocc.). 



1903. Pleuroprion, id. ibid. xxvi. p. 31. 



1905. Eichardson, Bull. U.S. Nat. Mus. No. 54, p. 342. 



1908. Stebbing, S. Afr. Crust, pt. 4, pp. 51, 52. 



PLEUROPRION CHUNI, zur Strassen. 



1902. Antares chuni, zur Strassen, Zool. Anz. xxv. p. 687, text-fig. 4. 



1903. Pleuroprion chuni, id. ibid. xxvi. p. 31. 



One <? and one ? from the Agulhas Bank, 156 metres 

 (" Valdivia ") (omitted from the General Catalogue, 1910). 



FAMILY STENETEIIDAE. 



1905. Stenetriidae, Hansen, Proc. Zool. Soc. Lond. 1904, ii. 2. 



p. 315. 

 1905. ,, Eichardson, Bull. U.SNat. Mus. No. 54, p. 439. 



