250 Aniialx of the South African Museum. 



ramifying through a sponge covering the gastropod Tritonium inurrayi 

 (Smith). 



EURYSTHEUS IMMINENS 11. Sp. 



(Plate XXVIII. Fig. 12.) 



This species may be briefly characterised as follows : Eyes obliquely 

 oblong; antennae of normal length; 1st gnathopod in <$ with palm 

 very oblique, without defining tooth, but with a small spine, entire 

 but exceedingly finelv crenulate, finger matching palm, inner margin 

 serrulate, in $ similar; 2nd gnathopod in <$ very like that of E. 

 longicornis Walker (1907, Nat. Antarct. Exp. vol. 3, p. 35, pi. 12, 

 fig. 21) but longer proportionately to breadth (more like that of E. 

 atlanticus) , a large spine above the defining tooth, another tooth in 

 centre of palm, and between this and hinge a tooth larger than either 

 of the others, all three apically blunt and surrounded by a pellucid 

 border which is minutely fimbriate, finger matching palm, inner 

 margin basally convex, smooth, in $ similar but a small notch above 

 the defining .angle of palm, with a spine in it, palm finely serrate, 

 finger equalling palm, inner margin finely serrulate. 



Telsou and uropods as in E. afer. 



Length : t>'5 mm. 



Colour : In spirit, pale pinkish. 



Locality : Morewood Cove NW. by N. f N., distant 3 miles (Natal 

 coast). 27 fathoms. 1 <$ , 2 ovigerous $ ?. s.s. " Pieter Faure." 

 19/12/00. (S.A.M. No. A2778.) 



Closely resembling E. afer in most characters, but agreeing with 

 E. longicornis as regards the 2nd guathopod. Distinguished from the 

 latter by the absence of very long antennae and by the characters of 

 the telson and uropods. It cannot be denied that the four Southern 

 species E. atJanticus, afer, longicornis and imminens are very closely 

 allied, and it is quite possible that intermediate forms may crop up 

 which will necessitate uniting them all under one name. 



It also resembles E. dentatus (Chevreux) in the form of the 2nd 

 gnathopod of <$ , but the differently shaped eye, the entire 1st side-plate 

 and absence of teeth on the pleon serve to distinguish it. 



EURYSTHEUS SEMIDENTATUS n. sp. 

 (Plate XXVIII. Figs. 13, 14.) 



Lateral angles of head not much produced, obtuse. Eyes small, 

 horizontally oval. Inferior margin of side-plates 1-3 setose, but not 



