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NOZEHAN (C.). Over de inlandische Zoetwater Spongie, Haarlem, 



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 SAVIGNY (J. C.). Description de 1'Egypte, Iconographie, Paris, 



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 BERTOLONI (A.). Sopra alcune produx. nat. (Spongitarii) nel 



golfo della Spezia, Modena, 1832, 4to. 1 plate. 

 MILNE-ED WARDS (H.). Cuvier, Eegne Animal (edit. Masson), 



1850, Zoophytes, pi. 95. 

 THOMPSON (TV.). Natural History of Ireland, vol. iv, 1856, 



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 GREENE (J. E.). Manual of the Protozoa, 1859, pp. 3043 



(woodcuts). 

 CHIMMO (TV.). Natural History of the EuplecteUa aspergillum, 



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 BALFOUR (F. M.). On the Morphology of the Spongidro, Quart. 



Journ. Micros. Science, vol. xix, 1879, p. 103. 



