250 Annals of the South African Museum. 
ramifying through a sponge covering the gastropod Tritoniwm murrayi 
(Smith). 
EURYSTHEUS IMMINENS N. sp. 
(Plate XXVIII. Fig. 12.) 
This species may be briefly characterised as follows: Eyes obliquely 
oblong; antennae of normal length; Ist gnathopod in ¢ with palm 
very oblique, without defining tooth, but with a small spine, entire 
but exceedingly finely crenulate, finger matching palm, inner margin 
serrulate, in 2 similar; 2nd gnathopod in ¢ very lke that of ZL. 
longicornis Walker (1907, Nat. Antarct. Exp. vol. 3, p. 35, pl. 12, 
fig. 21) but longer proportionately to breadth (amore lke that of £. 
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 peilucid 
border which is minutely fimbriate, finger matching palm, inner 
margin basally convex, smooth, in 2 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. 
Telson and uropods as in E. afer. 
Length : 65 mm. 
Colour: In spirit, pale pinkish. 
Locality : Morewood Cove NW. by N.? N., distant 3 miles (Natal 
coast). 27 fathoms. 1 @, 2 ovigerous ? 9. s.s. “ Pieter Faure.” 
19/12/00. (S.A.M. No. A2778.) 
Closely resembling H. afer in most characters, but agreemg 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 H. atlanticus, 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 H. dentatus (Chevreux) in the form of the 2nd 
gnathopod of ¢, but the differently shaped eye, the entire Ist side-plate 
and absence of teeth on the pleon serve to distinguish it. 
EURYSTHEUS SEMIDENTATUS Nn. 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 
