1 82 PORIFERA. 



1 8. "Structure and Affinities of the Genus Siphonia." 'Quart. Journ. 



Geol. Soc' Vol. xxxiii. 1877. Sollas. 



19. "On Pharetrospongia Strahani." 'Quart. Journ. Geol. Soc' Vol. 



xxxiii. 1877. Sollas. 



20. " On the Structure and Affinities of the Genus Protospongia." ' Quart. 



Journ. Geol. Soc' Vol. xxxvi. 1880. Sollas. 



21. "On the Flint Nodules of the Trimmingham Chalk." 'Ann. and 



Mag. Nat. Hist.,' 1880. Sollas. 



22. " On Fossil Sponge-Spicules from the Carboniferous Strata of Ben 



Bulben." 'Ann. & Mag. Nat. Hist.,' 1880. Carter. 



23. "Further Observations on the So-called ' Farringdon Sponges.'" 



'Ann. & Mag. Nat. Hist.,' 1883. Carter. 



24. " Die Pharetronen aus dem Cenoman von Essen, und die systema- 



tische Stellung der Pharetronen." ' Palaeontographica.' Bd. 29, 



1883. Dunikowski. 



25. " Beitrage zur Kenntniss der Spongien der bohmischen Kreide-for- 



mation." 'Abhandl. der k. bohm. Gesell. der Wiss.' 1883-85. 

 Pocta. 



26. " Descriptions of Fossil Reticulate Sponges, constituting the Family 



Dictyospongidae." ' Thirty-fifth Ann. Rep. on the State Cabinet. 



1884. Hall. 



27. " Remarks on Dictyophyton." ' Bulletin of the Amer. Mus. Nat. 



Hist ' 1881. Whitfield. 



