86 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



Figs. 163-172. — Pigdebs illdstkating akm stkuctube of Comatdlids. 163. Dorsal view op 

 specimen of comatula pectinata fkom singapore, showing diffeebnce in length of the arms. 



164. Centrodorsal and arm bases OP SPECIMEN OF Heliometra m.\xima with twelve arms. 



165. Radial, division series and arm bases of Ptilometba mUlleri. 166. Same, with homologies 

 OF OSSICLES shown. 167. IBh series and proximal brachials of Tropiometra afra, with 

 homologies op ossicles indicated (see fig. 116). 168. Proximal portion op an arm pair of 

 Htpalocrinds naresianus, with homologies of ossicles indicated. 169. IBr axillary, division 

 series and proximal brachials of Comantheria alternans. 170. Same, with ho.mologies of 

 ossicles indicated. 171. Radial, division series and ptikximal brachials of Comanthcs ben- 

 nktti. 172. Same, with homologies op ossicles indicated. 



