A MONOGRAPH OF THE EXISTING CRINOID8 417 



part, P. H. Carpenter, 1888); p. 39 { = Acl. belli Daderlein, 1898, part); p. 84 (synonymy; 



habitat; differential characters); Unstalked Crinoida of the Siboga Exped., 1918, pp. 35, 36 



(in key; range). — H. L. Clark, The Echinoderm Fauna of Torres Strait, 1921, p. 6 (history); 



p. 15 (discussion); pp. 192 and following (range). 

 Comaster novaeguineae A. H. Clark, Crinoida of the Indian Ocean, 1912, p. 35 (identity); p. 87 



(synonymy; summary of previous records; description of the type); Unstalked Crinoids of the 



Siboga Exped., 1918, p. 35 (in key; range); p. 37 (synonymy; stations 89,231; Maumeri, Flores); 



p. 274 (listed). — H. L. Clark, The Echinoderm Fauna of Torres Strait, 1921, p. 6 (history); 



p. 15 (range; not found by the Carnegie expedition, 1913; color in life of Philippine specimens); 



p. 192 and following (range). 

 Comaster novaeguinea A. H. Clark, Unstalked Crinoids of the Siboga Exped., 1918, pp. 272, 276 



(listed). 



Diagnostic features. — Large and robust, with the division scries broad and 

 massive and the interbrachial perisome usually heavily plated. The arms average 

 80 in number, and are usually considerably more in fully grown individuals. There 

 is no conspicuous dark mediodorsal line on the division series and arms, though an 

 indistinct trace of such a line may be present. The centrodorsal is greatly reduced, 

 stellate, with no trace of cirri in the fully grown animal; in the young when cirri are 

 present they are few in number and irregularly distributed about the margin of the 

 centrodorsal. 



Notes. — The specimen from New Harbour described and figured by Professor 

 Lov6n has 80 arms. The IIBr series are 4 (3 + 4), each bearing 2 IIIBr 2 (1+2) 

 series. The IIIBr series bear externally an undivided arm, and internally a IVBr 

 2 (1+2) series. The IVBr series bear an undivided arm and a VBr 2 (1+2) series, 

 the position of these being reversed in reference to the division series and undivided 

 arm preceding. The VBr series bear 2 undivided arms. 



The IIIBr and all subsequent axillaries therefore carry one division series and an 

 undivided arm which alternate in position on succeeding axillaries, the first of the 

 undivided arms (that on the IIIBr axillary) being always external in reference to the 

 IIBr series. 



The centrodorsal is greatly reduced, stellate, and flush with the radial ring. 

 There are about VIII rudimentary cirri irregularly situated in the radial areas. 



The radius of the centrodorsal is 1.3 mm. The radius of the radial pentagon is 

 2.0 mm. The distance from the middle of the centrodorsal to the apex of the IBr 

 axillary is 5.8 mm. The IIBr series are 5.2 mm. long. The IIIBr series are 2 mm. 

 long. The IVBr series are 2 mm. long, and the VBr series are 1.8 mm. long. The 

 undivided arms are 110 mm. long. The distance from the middle of the centrodorsal 

 to the arm tips is 126.8 mm. 



The specimen from the Danish expedition to the Kei Islands station 37 has about 

 150 arms. The centrodorsal is a thin disk, rounded pentagonal, with XII cirri of 

 various sizes, though none fully developed; the largest is 13 mm. long with 14 segments, 

 slender and straight. 



In the specimen from the Moluccas which served Miiller as the type of his Alecto 

 multijida there are 45 arms. The typical scheme of arm division is as follows: There 

 are 10 IIBr 4 (3 + 4) scries. Each of these carries externally a IIIBr 2 series and 

 internally an undivided arm; the IIIBr series bears externally an undivided arm and 

 internally a IVBr 2 series. The IVBr series carries 2 imdivided arms. As in Lov6n's 

 97298—31 28 



