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6. Haeckel. — "Die Kalkschwamme." 



6. SoLLAS. — Article "Sponges," in the * Encyclopsedia Britannica,' 



ed. 9. 



7. ScnuLZE. — "Ueber den Bau und die Entwickelung von Sycandra 



rapbanus," ' Zeitschr. f. wiss. Zoologie,' Band xxv, suppl. 



8. PoLEJAEFF. — ' Report on the Calcarea of the " Challenger " Expedition.' 



9. Dendy. — " Studies on the Comparative Anatomy of Sponges. III. On 



the Anatomy of Grantia labyrinthica, Carter, and the so-called 

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 vol. xxxii, N. S. 



10. Von Lendenfeld. — " Die Spongien der Adria. I. Die Kalkschwamme," 



' Zeitschr. f. wiss. Zoologie,' Band liii. 



11. Von Lendenfeld. — "A Monograph of the Australian Sponges," 



' Proceedings of the Linnean Society of New South Wales,' vols, 

 ix and x. 



12. Carter. — "Descriptions of Sponges from the Neighbourhood of Port 



Phillip Heads, South Australia," 'Annals and Magazine of Natural 

 History,' 1885—1887. 



13. Dendy. — "Preliminary Account of Synute pulchella, a New Genus 



and Species of Calcareous Sponges," ' Proceedings of the Royal Society 

 of Victoria,' vol. iv. 



14. VosMAER. — "Porifera," in Bronn's 'Klassen und Ordnungen des Thier- 



Reichs.' 



15. Carter. — "Description of Aphroceras ramosa," ' Proc. Lit. Phil. 



Soc. Liverpool,' vol. xl, appendix. 



16. Dendy. — " Description of a New Species of Leucosolenia from the 



Neighbourhood of Port Phillip Heads," ' Proceedings of the Royal 

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17. Schmidt. — ' Die Spongien des Adriatischen Meeres,' supplement 1. 



18. Gray. — " Notes on the Arrangement of Sponges, with the Description 



of some New Genera," ' Proceedings of the Zoological Society of 

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10. Schmidt. — ' Grundziige einer Spongien — Eauna des atlantischen 



Gebietes. 



20. — Haeckel. — "Prodromus eines Systems der Kalkschwamme," ' Jenaische 

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21. Bidder. — Review of "A Monograph of the Victorian Sponges," 



' Quarterly Journal of Microscopical Science,' vol. xxxii, N. S. 



22. Bidder. — "Preliminary Note on the Physiology of Sponges," 'Proceed- 



ings of the Cambridge Philosophical Society,' vol. vi. 



