Sponges from South Australia. 



215 



tabular view of my proposed classification of the order 

 Psammonemata, given in the ' Annals ' of 1875 (vol. xvi. 

 pp. 188 and 189), in order that the revision suggested by 

 Mr. Wilson's specimens may be the better followed and 

 understood : — 



Order. 



Families. 



Groups. 



1. Euspong-iosa. 



1. Bibtdida -j 2. Paraspongiosa. 



3. Hircirdosa. 

 f 4. Callhistia. 



5. Penicillata. 



6. Rigida. 



7. Subrigida. 



8. Foliata. 



9. Dactylifera. 

 III. Psammonemata. <j 2. Hircinida -\ 10. Fenestrata. 



11. Platyfibra. 



12. Peraxiata. 



13. Incrustata. 



14. Otahitica. 



15. Sarcocornea. 

 1^16. Arenosa. 



17. Pseudoarenosa. 

 3. Pseudohircinida . . \ 18. Chalinohircinina. 

 19. Armatokirciiiina. 



Gen. Dysidea, Johnston. 



Char, emend. Fibrous arenaceous sponges, in which the 

 fibre is chiefly composed of foreign microscopic objects (sand, 

 fragmentary sponge-spicules, &c), held together by a mere 

 film of keratine, supporting the flakes of the parenchymatous 

 sarcode ; traversed by the branches of the excretory canal- 

 system ; assuming a variety of sponge-like forms, on which 

 the pore-dermis may be continuous and smooth, or rendered 

 more or less uneven and rough by projection of the subjacent 

 fibre, according to the species. 



1. Dysidea fragiiis, Johnston. 



Massive, sessile, simply convex or lobed. Consistence 

 soft and resilient when fresh, firm when dry. Colour, when 

 fresh, faint violet or whitish grey, sponge-yellow when dry. 

 Surface conulated in much relief; conuli held together by a 

 soft reticulated fibrous membrane. Pores in the interstices 

 of the reticulation. Vents here and there, chiefly on the 

 most prominent parts. Structure fibro-reticulated ; interstices 

 tympanized by the parenchymatous sarcode traversed by the 



