REVISION ''BRITISH SPONGIAD^." 261 



4. Studies on the Comparative Anatomy of 



Sponges. V. Observations on the Structure and 

 Classification of the Calcarea Heterocoela. Q. J. 

 Micr. Science (N.S.), No. 138, 1893, pp. 159—257' 



5. Grentzenberg, Max. Die Spongienfauna der 



Ostsee. Inaugural— Dissertation. Kiel, 1891. 



6. H^CKEL, E. Die Kalkschwamme : eine Mono- 



graphie. 3 Bde. Berlin, 1872. [Keferences apply 

 to Band II only.] 



7. Hanitsch, K. Second Eeport on the Porifera of the 



L.M.B.C. District. Proc. Liverpool Biol. Soc, 



Vol. Ill, pp. 155—173. 

 8. Third Keport on the Porifera of the 



L.M.B.C. District. Trans. Liverpool Biol. Soc, 



Vol. IV, pp. 192—238. 

 9. Notes on some Sponges collected by 



Professor Herdman off the West Coast of Ireland 



from the 'Argo.' Trans. Liverpool Biol. Soc, 



Vol. V, pp. 213—222, 



10. Hansen, G. Armauer. Spongiadae. In: The Nor- 



wegian North-Atlantic Expedition, 1876 — 1878. 

 Christiania, 1885. 



11. Lendenfeld, E. VON. Descriptive Catalogue of the 



Sponges in the Australian Museum, Sydney. 1888. 



12. A Monograph of the Horny Sponges. 



1889. 



13. Das System der Spongien. Abhandl. d. 



Senckenb. naturf. Gesellschaft, Frankfurt a. M., 

 1890. 



14. KiDLEY, Stuart 0. and Dendy, Arthur. Keport on 



the Monaxonida collected by H.M.S. ' Challenger' 

 during the years 1873 — 76. 



15. Schmidt, Oscar. Grundziige einer Spongien-Fauna 



des Atlantischen Gebietes. Leipzig, 1870. 



