MONOGEAPH OF THE EXISTING CRINOIDS. 



275 



ventral to the central canal (thus giving the portion of the distal border of the cirrals 

 which is ventral to the transverse ridge a slanting direction toward the tip of the 

 cirrus), while the mass of the segments dorsal to the central canal is pulled proxi- 

 mally for a distance which is as much less than that to which the ventral part 



Fig. 319. 



ca:==c=]^^a:^ 



Fig. 320. 

 Figs. 319-320.— 319, Lateral view of BEGENEBATiNa cihri from a sPEaMEN of Tropiometba macbodiscds raoM 



SODTHEKN JAPAN. 320, ABNORMAL AND NORMAL CIRRI OF A SPEaMEN OF COMASTER DISTINCTA FROM THE LESSER 



SuNDA Islands. A, A CIRRUS flattened dorsoventrally, witu tue dorsal processes doubled and placed 



LATERALLY, IN (a) DORS.IL AND IN (6) LATERAL ^lEW. B, A NORMAL CIRRUS, LATERALLY FLATTENED, VIEWED (O) 

 LATERALLY AND (6) DORSALLY. 



of the segments is extended as the difference in volume between the two 

 hgament masses, the extension of the small ventral ligament mass being com- 

 pensated by a comparatively small contraction of the large dorsal ligament mass 

 (figs. 322, p. 277, and 5S7a, pi. 13). 



