Plate 9. 



Fig. 1. Eurete erecf.um gracile. Gastral scopula; x 450. 



2. Sclerothamnopsis compressa. From a photograph ; \. 



3. Exirete erectum gracile. Gastral scopula ; x 450. 



4. Sclcrothamno2Jsis compressa. From a photograph ; two of the smallest branches 



shown ; X 2. 



5. Eurete erectum gracile. From a photograph ; \. 



6. Sclerothamnojjsis compressa. Pinulus ; x 170. 



7. " " Oxyhexaster; x 250. 



8. " " Upper end of scopula ; x 250. 



9. Begadrella, sp). Skeletal framework ; from a photograph ; \\. 



10. Sderotliamnoijsis compjressa. Spinose hexact ; x 170. 



11. " " Skeletal reticulum ; from a transverse section. 



Upper margin of figure represents surface of 

 sponge ; x 70. 



