Plate 8. 



Fig. 1. Eurete erectum tubulifenim. From a photograph ; sponge viewed from side ; \. 

 2. " " " Gastial hexact with scopula ; x 250. 



" 3. " " " Dermal pinulus with scopula ; x 250. 



" 4. Eurete erectum (jrncile. Onychaster ; x 450. 

 " 5. " " " Dermal pinulus ; x 250. 



" 6. Eurete erectum. tiihuliferum,. Gastral hexact ; x 250. 



" 7. Eurete erectum mucroiiatmn. Oxyhexaster ; x 450. 



" 8. Eurete erectum grucile. Gastral hexact; x 250. 

 " 9. " " " Characteristic dermal scopula; x 450. 



