104 DISCOVERY REPORTS 



end of the third segment extends over the distal end of the second segment and may entirely cover 

 it in dorsal view. 



The genus Amblyops therefore now contains six species, A. abbreviata, A. ketnpii, A. tenuicauda, 

 A. tattersalli and two new species A. durbani and A. antarctica. 



Amblyops durbani sp.n. 

 Occurrence: (Fig. 21A-H) 



St. 436. 20. ix. 30 (day). Off Durban, 4i6(-o) m., 1 <J, 9-2 mm., 6 ??, largest 10-2 mm. Types. 



Description. General form short and more robust than is usual in the genus; all the parts anterior 

 to the cervical sulcus are particularly short, the broadly rounded rostral plate covers more than half 

 the eyeplates, which themselves are very short and cover the whole of the first segments of the anten- 

 nular peduncles, these again are very short. As a result the anterior part of the animal looks as though 

 it had been telescoped. Carapace short and wide; anterior margin very slightly convex; antero- 

 lateral angles broadly rounded ; posterior margin only slightly emarginate but the carapace is so short 

 that the last two thoracic somites are completely uncovered in dorsal view (Fig. 21 A). Antennular 

 peduncle very short and broad ; outer distal angle of first segment strongly produced and tipped with 

 a group of plumose setae ; second segment short with a single long plumose seta on its inner margin ; 

 third segment nearly square in dorsal view, almost as long as the second and first segments together, 

 armed along the inner margin with six strong plumose setae with bulbous bases and a group of setae 

 at the inner distal angle at the base of the inner flagellum; outer flagellum twice as stout as the inner 

 (Figs. 21 A, B). Antennal scale rather broad towards the proximal end, thence tapering evenly towards 

 the apex ; outer margin straight with no serrations at the distal end ; scale 3 \ times as long as its greatest 

 breadth, apex very small and evenly rounded, equal in length to the tooth terminating the outer 

 margin, no subsidiary spine on the inner face of the terminal tooth, small distal suture present. 

 Peduncle less than half as long as the scale, four-segmented, of the form described for the genus. 

 Strong spine present on the ventral side of the outer distal corner of the sympod (Fig. 21 A, C). 

 Eyeplates nearly twice as broad as long with a well-developed papilla projecting forward in the median 

 line beyond the anterior margin of each plate; anterior region densely spinulose especially on the 

 antero-lateral angles, the spinules being long and slender (Fig. 20 A, D). Endopods of thoracic 

 appendages rather more robust and shorter than is usual in the genus ; the male genital organ on the 

 eighth thoracic appendage short and thick, its proximal half swollen ; distal half tubular and tipped 

 with three strong setae (Fig. 21 E). Uropods: exopods, i\ times as long as the telson; endopods shorter 

 but extending beyond the tips of the long apical spines of the telson ; armed on the inner margin near 

 the statocyst with three long slender graduated spines. In one specimen there were only two spines 

 on one of the uropods though the other had the normal three (Fig. 21 A, F). Telson linguiform, if times 

 as long as broad at the base ; lateral margins concave near the rounded base and thence nearly parallel 

 to the broadly rounded, almost truncate apex ; breadth just proximal to the apex one-fourth of the 

 total length ; lateral margins armed along the distal half of their length with about twelve graduated 

 spines, which increase regularly towards the apex and form a continuous series with the long apical 

 spines. Apex armed with three pairs of extremely long spines, of which the innermost pair is the 

 longest and measures one-fourth of the length of the telson. This pair of spines is set close together, so 

 that there is no apparent break in the series running round the telson as in Amblyops obtusa. Under 

 a high magnification two small spinules can be seen in the median line and these are set so closely 

 together that they may appear like a single spinule with a bifid tip. A pair of long plumose setae 

 arises immediately above these spinules (Fig. 21 A, G, H). 



