Plate VI. 



EuplectelJa oweni Herkl. & Marsh. 



Fig. 1. A specimen with comparatively prominently developed ledges. 

 7:5 nat. size. 



Fig. 2. Upper end of the largest specimen in the Sei, Coll. Mus. seen from 

 the narrower side, -/s ^^^- '^i^^- 



Fig. .3. Lower portion of the same specimen, seen from the broader side. 

 -/^ nat. size. 



Fig. 4. A specimen (Mr. Owston's) with little ledges or none at all. -/s 

 nat. size. 



Figs. 5-6. Oxyhexasters. 440 x . 



Figs. 7-9. Anchor-heads of basal spicules. Figs. 7 & 8, abnormally de- 

 veloped. Fig. 9, normal. 1.50 x . 



Fig. 10. Oscularia in situ. To the left, edge of the oscular membrane. 

 100 X . 



