210 Annals of the South African Museum. 



very shallow and not expanded. In the specimen from False Bay 

 the tubercles are absent. 



The male appendage on 3rd peraeon segment in both young and 

 adult takes the form of a low button-like protuberance, posteriorly 

 bilobed. 



The male stylet on 7th peraeon segment only slightly tapering, 

 with blunt apex. 



First pleopod, peduncle with obliquely transverse row of 5 plumose 

 spine-setae near base, rami a little longer than peduncle, broadest 

 distally, outer ramus with 3 strong plumose setae near base, both 

 margins and apex with long plumose setae, outer margin (next outer 

 ramus) of inner ramus without setae. In $ only the apices are 

 setose. 



Second pleopod J , peduncle stouter than in first pleopod, with 

 transverse row of ca. 5 spines at about the middle, rami longer than 

 peduncle, penial filament longer than ramus, very narrow and 

 deeply bifurcate at apex. (This seems to be more correct than 

 describing it as ending in 2 long setae.) 



Third-fifth pleopods ovate-lanceolate. 



Uropods, elongate lanceolate, proximal end rounded, distal end 

 tapering, distal part of hinge margin fringed with plumose setae, 

 exposed ramus triangular, longer than broad, minutely setulose all 

 round, without spine, concealed ramus two-thirds length of exposed 

 ramus, and rather over one-third its width, with 2 long apical 

 setae. 



Length $ : 12 mm. ; 5 : 10 mm. Second antennae $ : 8 mm. ; 

 $ : 6 mm. 



Length of 2 from False Bay : 8 mm. 



Colour : In spirit, yellowish white. 



Locality : 10 miles N. of Eobben Island, Table Bay. 28 fathoms. 

 $ 3 and ? $ (with ova and embryos). 28/10/97. False Bay (Seal 

 Island, SW. ^ S. distant -J mile). 11 fathoms. 1 ? with embryos. 

 12/11/02. s.s. " Pieter Faure." (S.A.M. Nos. A54 and A53.) 



This species is very near Arc turns corniger, Stebbing. This latter, 

 however, has 6 tubercles (2 median, 1 anterior pair and 1 posterior 

 pair) instead of 5 on the 4th peraeon segment ; the body is not 

 setose ; and the marsupial plate on the 4th segment has a row of 

 tubercles (6 in the figure) below the hinge-line. 



I have placed this species in the genus Arcturopsis on account of 

 its general shape and the presence of an appendage on the 3rd 

 peraeon segment in the $ . This last feature Koehler says is 



