EXPLANATION OF THE PLATES. 673 



Fig. n. Toxocludina robusta, portion of skeleton, showing primary 

 and secondary fibre. »'. Skeleton acerate and tricurvato 

 acerate spicules, x 370. From type specimen from Port 

 Jackson. 



o. Pachychalina macrodactyla. Skeleton-spicule, x 190. 

 From specimen figured Plate XL. fig. P>. 



p. Protoschmidtia Jiisjridida, portion of vertical section, x 

 68. p. Skeleton-spicule, x 190. From type specimen 

 from Albany Island. [Note. — Some loose spicules in tbo 

 interspaces of the skeleton have been omitted for the sake 

 of clearness.] 



q. Bhizochalina spaikulif&ra. Skeleton-spiculcs, x 68. From 

 type specimen from Thursday Island. 



r. M. canalis. Skeleton-spicule, x 68. From type specimen 

 from Port Darwin. 



s. It. singaporensis, var. Spicules, x 190. From specimen 

 from West Island, Torres Straits. 



t. Schmidtia variabilis. Spicules, x 68. From type specimen 

 from Port Darwin. [The median curve of the diagonally- 

 placed spicule is represented as too sudden, and the two 

 lateral curves introduced do not exist.] 



u. Iieniera testudinaria, part of vertical section, x 38. u. 

 Spicules, x 68. From dry specimen from Port Denison. 



v' . Pellina muricata. Skeleton-spicule, with ends of two 

 others, exhibiting the wide range of variation, x 190. 

 From type specimen from Port Darwin. 



iv. P. aliformis. Skeleton-spicule, x 68. From type specimen 

 from Port Darwin. 



ec. P. eusiphonia. Skeleton-spicules, x 68. From type speci- 

 men from Port Darwin. 



y. Amphilectus hispidulus, vertical section, x 68. y'. Skeleton 

 acuate spicule, x 190. y" . Anchorate spicule from front 

 and side, x 370. From type (dry) specimen from Thurs- 

 day Island. 



2z 



