A MONOGRAPH OF THE EXISTING CKINOIDS 269 



The figure, drawn by Mr. C. Berjeau, who drew many of the excellent figures 

 for the Challenger report on the comatulids (plates 1-5, and in cooperation with 

 Highley plates 6-37, 63, 66, and 70) and therefore may be regarded as reliable, shows 

 a species with the proximal profile broadly rounded as in G. septentrionalis. 



According to Gislen the cirri are arranged in 10 columns on the centrodorsal. 

 The figure shows them to have about 16 segments and Dr. Hubert Lyman Clark says 

 they are 18-20 mm. long. All but the basal segments are longer than broad, the longest 

 from half again to twice as long as broad, the distal from slightly longer than broad to 

 nearly half again as long as broad. Berjeau shows a slight opposing spine which Gisk4n 

 says is spiny. 



The radials are concealed, and the IB^ may be more or less concealed. In the 

 figure six IIBr series are shown of which five are 4(3+4) and one is 2. The division 

 series and lower brachials are apparently evenly rounded dorsally and not rugose. 



There are 11-17 arms. 



The first syzygy appears to be between brachials 1+2 and the next from between 

 brachials 11 + 12 to between brachials 13 + 14. 



Pi is shown as slender, tapering evenly from the base to the tip, flexible, with 31 

 segments of which the earlier are somewhat broader than long and the distal are longer 

 than broad. P 2 is similar. P 3 and P 4 are of about the same length but have only 18 

 segments of which the second-fifth or -sixth are considerably broadened, the pinnule 

 beyond these tapering graually to a slender tip. 



Notes.- — I examined 28 specimens of this species in the British Museum and noted 

 that the centrodorsal bears radial furrows, which would indicate that the cirri are 

 arranged in 10 columns, 2 in each radial area; but in the Siboga report I ranged this 

 species with those having the cirri in 15 columns. Gislen in 1928 wrote that in sclateri 

 the cirri are in 10 columns and called attention to the fact that I had placed it with 

 species having the cirri in 15 columns. The arms in the specimens examined by him 

 varied from 11 to 17. 



Localities. — Pieter Faure Nos. 12676 and 12711; East London bearing N. W., 

 1/2 N., 18 miles distant; 457-548 meters: hard ground and broken shells [Bell, 1905; 

 A. H. Clark, 1908, 1909, 1911, 1912, 1913, 1915, 1918, 1936; H. L. Clark, 1923; Gislen, 

 1928, 1934] (12, B. M.). 



Pieter Faure No. 12872; East London bearing N., 15 miles distant; 566 meters; 

 mud [H. L. Clark, 1923]. 



Pieter Faure No. 12792 [A. H. Clark, 1913] (4, B. M.). 



Pieter Faure No. 12885/6 [A. H. Clark, 1913] (1, B. M.). 



Pieter Faure; no locality [A. H. Clark, 1913] (11, B. M.). 



Geographical range. — Known only from off East London, South Africa. 



Bathymetrical range.- — From 548 (?457) to 566 meters. 



History. — Antedon sclateri was described by Prof. Francis Jeffrey Bell in 1905 

 from specimens dredged off East London, South Africa by the fisheries steamer Pieter 

 Faure in the course of marine investigations of the South African coasts. Professor 

 Bell placed the species in Carpenter's Savignyi group, which included the species of 

 Heterometra and Craspedometra, entirely overlooking the plating of the pinnule and 

 brachial ambulacra. 



