Contributions to Hie Crustacean Fauna of South Africa. 415 



The apically-cleft operculum in the 9 is unique, also the fused basal 

 portions of the 1st pleopods in <$ . 



Perhaps congeneric with Syneurycope Hansen, 1916. 



ILYCHTHONOS CAPENSIS n. sp. 

 (Plate XVII. Figs. 14-16.) 



Body smooth, glabrous. Head strongly convex in profile, in dorsal 

 view nearly circular, a little broader than long, lateral portions not 

 developed, frontal margin not produced but declivous between the 

 bases of 1st antennae. Peraeou segment 1 a little broader than head, 

 a little more than twice as broad as long, not embracing head ; 

 segment 2 a little longer and wider, not twice as broad as long ; 

 segments 3 and 4 subequal, posterior margins shorter than anterior 

 margins ; antero- lateral angles of all 4 anterior segments rounded ; 

 segments 5-7 together not nearly as long as the 4 anterior ones 

 together, segment 5 longer at the sides than dorsally, 6 of equal 

 length throughout, 7 longer dorsally than at the sides, its posterior 

 margin straight. Side-plates on segments 1-4 not very distinct. 



Pleon of a single segment, at least without visible suture between 

 the short basal and the longer distal portions, the latter broad proxi- 

 mally, contracting suddenly to a much narrower distal part which is 

 apically subacute. 



Antenna 1, 1st joint moderately stout, conical, 2nd inserted apically, 

 a little longer than 1st, 3rd a little longer than 2nd, flagellum equal 

 to 2nd plus 3rd, with ca. 12 indistinctly separated joints. 



Only the basal joints of antenna 2 remaining, 1st joint with a spine 

 on lower outer apex. 



Upper lip rounded, minutely setulose. 



Lower lip, inner apices of lobes quadrate, with a rather strong tuft 

 of setules. 



Mandible, cutting-edge 4-5 dentate, secondai-y cutting-edge bifid, 

 spine-row with 3 fimbriate spines, molar well developed, palp small, 

 unarmed, 1st joint shorter than 2nd, 3rd minute, indistinctly separated 

 from 2nd, tipped with 1 setule. 



Maxillae 1 and 2 normal. 



Maxilliped, 2nd joint longest, 4th and 5th broad, inner distal 

 margin of 5th with 3 denticles, 6th and 7th small but well developed, 

 6th not lobed internally, epipod very large, reaching to 5th joint, 

 nearly twice width of maxilliped, ovate, apex narrowly rounded, outf j r 

 margin angular. 



Peraeopods 1-4 slender, increasing in length posteriorly, very feebly 



31 



