Fig. 23. Synanthus mirabilis V. x 2 ; a, b, sutures between two individuals ; 

 c, branch of Paragorgia ; d, constricted and broken end of same type. 



Fig. 26. Paractis (Archadis) perdix V. £ size, from life, in extreme expansion. 



Fig. 27. Actinostola callosa V. ■£ size, from life, type. 



Fig. 28. Ammophiladis rapiformis V. §■ size, from life. 



Fig. 30. Stephanauge dbyssicola Ver. x 2; side view, from an alcoholic speci- 

 men, showing cinclides. 



Fig. 31. The same, partially expanded; type of Actinauge nexilis V. 



Fig. 32. Urticina crassicornis, $ nat. size; hexamerous variety, from a photo- 

 graph of a living specimen. 



The drawings are by A. H. Yerrill ; figs. 26, 27, 31 are modified from studies 

 by J. H. Emerton. 



