PLATE XXXIX. 



Metackinus angulatus, n. sp. 



Fig. 1. The calyx and arm-bases, . . . . . 



The disk ; an abnormal specimen, having a second smaller anal 

 tube by the side of the ordinary one, 



Portion of the stem, .... 



5. Upper and lower faces of a nodal joint, 



7. Upper and lower faces of an infra-nodal joint. 



An ordinary internodal joint, 



Lower face of a supra-nodal joint, 



Internodal joint of a varietal form of stem, . 



Side vievf of a portion of this stem, . 



The ambulacral skeleton of a pinnule ; from above, 



An arm-groove and brachial ambulacrum. 



Fig. 9, 



Fig. 10. 



Fig. 11, 



Fig. 12, 



Fig. 13, 



