A MONOGRAPH OF THE EXISTING CRINOIDS 239 



between brachials 17 + 18 to between brachials 21+22, and the distal intersyzygial 

 interval is 11 to 13 muscular articulations. This specimen was serving as host to no 

 less than 15 ophiurans (see Part 2, p. 645). 



The single specimen from Salaka has 20 arms. Like one of those from Khor 

 Shinab its color when living was brown and white. 



Of the two specimens from Khor Shinab one has 14 and the other 18 arms. The 

 second syzygy is in some cases between brachials 15 + 16, but usually it varies in po- 

 sition from between brachials 18 + 19 to between brachials 20+21, and others follow at 

 intervals of 8 to 10 muscular articulations. When living one was brown and white 

 and the other was purple and white. 



In the specimen in the Paris Museum from Muscat the dorsal spines on the 

 outer cirrus segments are very sharp. This suggests that this specimen may repre- 

 sent H. africana instead of H. savignii. When I examined it I did not question 

 Carpenter's earlier determination. 



Remarks. — The chief characteristics of this species are the strongly rounded and 

 well-separated postradial series and division series, which do not have produced 

 margins; the very long and slender, perfectly smooth, and evenly tapering P 2 and P 3 ; 

 and the long and slender spines on the outer cirrus segments. Nearly all individuals 

 have exactly 20 arms, 10 IIBr 4(3+4) series being present. 



Localities. — Red Sea; Egyptian coast [Audouin, in Savigny, 1826; Leuckart, 1833, 

 1839, 1842; de Blainville, 1836; Anonymous, 1837; J. Muller, 1841, 1849; Dujardin 

 and Hupe\ 1862; Knight, 1867; Ludwig, 18S0; A. H. Clark, 1907, 1908, 1909, 1911, 

 1912, 1918]. 



Red Sea; Hemprich and Ehrenberg [Leuckart, 1839, 1842; J. Muller, 1841, 1843, 

 1849; von Graff, 1877, 1884; Dujardin and Hupe, 1862; P. H. Carpenter, 1879, 1883, 

 1884, 1888; Ludwig, 1880; Bell, 1882; Braun, 1888; Hartlaub, 1891; A. H. Clark, 

 1907, 1908, 1909, 1911, 1912, 1918] (3, U.S.N.M., 35213; Berl. Mus., 1054, 1056). 



Red Sea; Count von der Decken [von Martens, 1869]. 



Gulf of Suez [A. H. Clark, 1912, 1913] (2, B.M.). 



Suez Bay; 7 meters [Ckadwick, 1908; A. H. Clark, 1911]. 



Tor, Red Sea [A. H. Clark, 1911, 1912] (1, Mus. f. Meereskunde, Berlin). 



Ul Shubuk; 16 meters; muddy bottom [Chadwick, 1908; A. H. Clark, 1911, 1912; 

 Boulenger, 1913]. 



Salaka; at the anchorage, among corals [Chadwick, 1908; A. H. Clark, 1911, 

 1912]. 



Khor Shinab; 18-22 meters [Chadwick, 1908; A. II. Clark, 1911, 1912] (1, U.S. 

 N.M., 35081). 



Muscat; M. de Rousseau, 1841 [P. H. Carpenter, 1888; A. H. Clark, 1911, 1912] 

 (1,P.M.). 



No locality [A. H. Clark, 1912] (1, Berl. M., 5371). 



Geographical range. — Red Sea and eastward to Muscat. 



Bathymetrical range. — From the shoreline down to 18 (?22) meters. Most of the 

 records are from the shoreline or from very shallow water. 



History.— This species was first made known through the excellent figures pub- 

 lished by M. Savigny in 1826 and identified in the explanation of the plate as Comatula 

 multiradiata. The species represented was referred to in 1833 by Professor Leuckart 



