References
- 1856 . Müller's Archiv , : 408 – 408 . t. 15. f. 17–23
- Icones histiologicæ , i 61 – 61 .
- 1856 . Müller's Archiv , pl. 15. f. 28, 29, 30; Bowerbank, British Spongiadæ, figs. 208–222, 317–319
- 1856 . Müller's Archiv , : 9 – 9 . Owen, Trans. Zool. Soc. iii. p. 203, pl. 13; Trans. Linn. Soc. xxii. pl. 21, see footnote, p. 118
- Fotton . Strata below the Chalk , 340 – 340 . pl. 15 a
- Verhandl. zool.-bot. Gesellschaft Wien , xii 85 – 85 . (Ann. Nat. Hist. ser. 3. xviii. 404.)