EXPLANATION OF PLATE XIV. 



Figs. 1-10. Batliyduriis- Icvis. F. E. Sell. 



Fig. 1. Upper end of a small specimen in lateral view. Nat. size. 



Fig. 2. Arrangement of the spicules in a transverse section of tlie body- 

 wall. X 40 (combined figure). 



Fig. ;5. Lateral view of an autoderma! stauractine. x ;300. 



Fig. 4. Surface-view of a similar autoderma! stauractine. x 300. 



Figs. 5 and 6. Ends of long parenchymal diactines. x 300. 



Fig. 7. Silica-pearl of the parenchyme. x 300. 



Fia:. 8. Autogastral hexactine. x 300. 



Fig. 9. Parenchymal hemioxyhexaster with two unbranched main-rays, 

 x 300. 



Fig. 10. Pai'enchymal oxyhexaster, each of the main-rays of which bears 

 two branch-rays. x 300. 



Figs. 11-17. Placopegma solutum. F. E. Seh. 



Fig. 11. View of the free surface. Nat. size. 



Fig. 12. AiTangement of the spicules in a transverse section of the body- 

 wall. X 60 (combined figure). 



Fig. l;'). Dermal oxypeutactine. x 200. • 



Fig. II. Parenchymal discohexaster. x 400. 



Fig. 15. Fiateral view of a terminal disc of a parenchymal discohexaster. 

 X 1000. 



Fig. 10. Anchor-spieide. x 500. 



Fig. 17. Gastral pentactine. x 200. 



