CLARK] NEW GENERA OF RECENT FREE CRINOIDS 363 



ish joints; the second or third pinnules (or both) may be elongated 

 and styliform; pinnules cylindrical, evenly tapering, slender, very 

 stiff and spine-like, the distal with the first two joints short and 

 squarish or trapezoidal, the others greatly elongated. 



Color in life very varied ; lavendar and yellow ; red-brown and 

 yellow ; red-brown, purple, yellow, and white ; yellow, orange, white, 

 or purple and white, the cirri almost invariably more or less banded 

 with purple and white or yellow. 



Type of the genus. — Antedon callista A. H. Clark, 1907. 



This well marked and handsome genus is found from the Ki 

 Islands northward to southern Japan, where it occurs in great abun- 

 dance. The only species known to Dr. Carpenter was Calometra 

 discoidea, which he placed in his "Accela group," together with 

 Pcccilometra accela. The next species known was described by Pro- 

 fessor Bell under the name of Antedon bassett-smithi, in 1894. It 

 was placed by him in the "Spinifera group." The other species 

 have all been recently discovered in the seas about southern Japan. 

 The species of the genus at present known are : 



Calometra bassett-smithi (Bell) Calometra multicolor (A. H. Clark) 



callista (A. H. Clark) " propinqua (A. H. Clark) 



" discoidea (P. H. Carpenter) " separata (A. H. Clark) 



fiavo purpurea (A. H.Clark) " thetis (A. H. Clark) 



Calometra versicolor (A. H. Clark) 



18. ADELOMETRA, gen. nov. 



Centro-dorsal columnar, bearing ten vertical rows of cirrus- 

 sockets ; cirri long and slender, with 60 or 70 segments little, if any, 

 longer than wide, quite uniform in length, the distal third becoming 

 short and developing spines ; disk and ambulacra naked ; costals com- 

 paratively narrow, well separated, the intercostal articulation rising 

 into a tubercle ; ten to fifteen ( ?) arms, distichals 2 or 4 (3 -f- 4), the 

 brachials all long (all but a very few in the proximal part of the 

 arms longer than wide) and discoidal, squarish, or more or less 

 quadrate ; third and fourth brachials united by syzygy, a second 

 syzygy between the thirteenth and fourteenth or sixteenth and seven- 

 teenth (or at some intermediate point), and others distally at in- 

 tervals of from two to seven (usually five or six) bifascial articula- 

 tions ; first pinnule much the longest, with elongated segments ; 

 following pinnules much shorter and less stout, becoming longer 

 again and more slender distally. 



Color (in spirits) : "The skeleton a very light brown, and the 

 perisome darker." 



