EXPLANATION OF THE PLATES. G75 



Fig. g. Phoriosponcjia fibrosa, cylindrical, bihamate, cquianchorate 

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

 men from Prince of Wales Channel. 



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

 front), h", small inequianchorate (from front and side) ; 

 h'", bihamate spicule ; and h"", trichite-bundle, x 370. 

 From type specimen from Alert Island, Torres Straits. 



i. Glathria eopphvjeri, small and large spincd acerate, and 

 smooth variety of end of latter, and smooth subspinulato 

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

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



j* 0. frondifera, smooth acerate spicule, three sizes, x 190. 

 j', spincd acuate, two forms, x 190 ; /', tricurvate spicule, 

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

 specimen from Fitzroy Island, Queensland. 



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

 acuate spicules, x 190. ¥, tricurvate, and k", equi- 

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

 specimen from Thursday Island. 



I. Raspailia bifurcata, portion of fibre from near base, show- 

 ing spined acuate spicule in situ, x 190. V, smooth 

 acuate and acerate spicules, x 38. From typo specimen 

 (in spirit) from Prince of Wales Channel. 



m. R. austrcdiensis, 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. Rliapliidopldus arborescens, smooth and spined acuate 

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

 n . Equianchorate seen from the front, x 370. From type 

 specimen from Friday Island. 



o. R. procerus, part of vertical section, x 68. o , skeleton- 

 spicules, 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. 



