EXPIANATION OF THE PLATES. 67& 



Pig. g, Phoriospongia fibrosa, cylindrical, bihamate, equianchorate 

 (from front and side) spicules, x 370. From type speci- 

 men from Prince of "Wales Channel. 



7i. Esperia pellueida, skeleton acuate spicule, h', large (from 

 front), Til', small inequianchorate (from front and side) ; 

 K", bihamate spicule ; and A"", tricbite-butidle, x 370. 

 From type specimen from Alert Island, Torres Straits. 



i. Olaihria coppingeri, small and large spined aoerate, and 

 smooth variety of end of latter, and smooth subspinulate 

 spicules, X 190. i', equianchorate spicule (from front 

 and side), x 370. Prom specimen from Albany Island. 



j.* G. frondifera, smooth acerate spicule, three sizes, X 190. 

 /, spined acuate, two forms, x 190 ; /', tricurvate spicule, 

 and/", equianchorate (from front and side), x 370. From 

 specimen from Fitzroy Island, Queensland. 



h. O. aculeata, smooth acuate and subspinulate, and spined 

 acuate spicules, X 190. k', tricurvate, and ¥', equi- 

 anchorate (from front and side), x370. From type 

 specimen from Thursday Island. 



Z. Baspailia hifurcata, portion of fibre from near base, show- 

 ing spined acuate spicule in situ, x 190. I', smooth 

 acuate and acerate spicules, x 38. From type specimen 

 (in spirit) from Prince of Wales Channel. 



m. B. australiensis, part of vertical section from near middle 

 of Sponge, X 38. m', larger and smaller acuate spicules, 

 X 68. From type specimen (in spirit) from Port 

 Darwin. 



n. Shaphidop'hlm arhorescens, smooth and spined acuate 



spicules, and head of spinulate variety of the former, x 190. 



«'. Equianchorate seen from the front, X 370. From type 



specimen from Friday Island. 

 0. S. procerus, part of vertical section, X 68. o', skeleton- 



spioules, X 68 ; o", flesh-spicules, x 370. From type 



specimen (in spirit) from Port Darwin. 



» This figure has been erroneously referred to as fig. i in the text on p. 448. 



