394 WILSON. 
EXPLANATION OF PLATE XIX. 
(Tedania Brucet.) 
Fic. 60. Portion of surface of adult, showing the meandering ridges and fur- 
rows. X 8. 
Fic. 61. Section of adult, vertical to surface — arrangement of gelatinous and 
spongy tissue, and skeleton. X Io. 
Fic. 62. Transverse section through base of oscular papilla. X 5. 
Fic. 63. Transverse section near oscular end of young sponge, 6 inches high. 
“G10: 
Fic. 64. Vertical section of adult — arrangement of canals in gelatinous and 
spongy regions. A.4. 
Fic. 65. Section of adult—disposition of the ultimate branches of the 
canals. D.4. 
Fic. 66. Dermal membrane. D.4. 
