590 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



into a dorsal spine. The opposing spine is blunt, forked, or represented by a short 

 transverse ridge. 



The radials are concealed by the broad centrodorsal. The IIBr series are 4 

 (3+4). IIIBr series are rarely present. They have only been recorded in 2 individ- 

 uals, one having 2, both 2, and one having 1,4 (3+4). The division series are broad, 

 more or less flattened dorsally, and very close together laterally. Their component 

 ossicles have everted and finely spinous distal ends. 



The arms are 13-21 (usually 16-20) in number, and in fully grown examples are 

 usually from 60 to 80 mm. in length. They are short, stout, and rapidly tapering. 

 In well-developed specimens they may broaden somewhat from the base to about the 

 twelfth or fourteenth brachial, tapering rapidly from that point onward. The 

 brachials are short, with conspicuously produced and overlapping distal ends. 



Notes. — Miiller described the original specimens from Durban as follows: The 

 centrodorsal is quite flat, or even concave. The cirri are marginal. 



The cnri are XXIV, about 17. The 8 or 9 segments in the distal half bear a small 

 dorsal spiue. The basal segments are thicker and broader than long, those following 

 are longer than broad, and the distal are as long as broad. 



The radials are concealed, but the IBr series are visible. The IIBr series are 

 4 (3 + 4). 



The 20 arms are from 67.5 to 80 mm. in length and are composed of short 

 brachials. 



The intersyzygial interval is 4-6 muscular articulations. 



The first pinnule is larger than the second, and the second is larger than the third. 

 At the base of the arms the distal segments of the pinnules are provided with a high 

 produced keel (the teeth of the terminal comb). 



Of these specimens, which Miiller studied in the Museum of the Academy of 

 Sciences at Stockholm, 2 were given to the Berlin Museum, and the Berlin Museum 

 subsequently presented 1 of these to the United States National Museum. 



In 1 of these 2 last the dorsal pole of the centrodorsal is flat and rather broad, 

 2.5 mm. in diameter. 



The cirri are XIII, 15-16 (usually the latter), 10 mm. long. The first segment 

 is very short, and those following increase in length so that the fifth is twice as long 

 as its proximal width and the sixth is nearly as long. The eighth or ninth and foDow- 

 ing are slightly broader than long. In all cases the fifth is a transition segment. 



The transition and following segments have shghtly everted distal dorsal edges 

 which appear as minute sharp subterminal tubercles in lateral view, on the last few 

 segments becoming a submedian transverse ridge, but not resolving into a dorsal 

 spine. The opposing spine is blunt, forked, or represented by a short transverse ridge. 



There are 20 arms 45 mm. long. All of the IIBr series are present, and all are 

 4 (3 + 4). 



The other specimen is similar. 



The 20 specimens from oft" Algoa Bay which I have examined are all young, with 

 from 10 to 12 arms. 



