BIBLIOGRAPHY. 43 



230. 1885 Hinde, G. J. On Beds of Sponge-remains in the Lower and Upper 



Greensands of the South of England (Phil. Trans. Boy. Soc, Pt. II, 



pp. 403—453, Pis. 40—45). 

 Strata of chert and siliceous rock are shown to consist mainly of various forms 

 of detached spicules of siliceous Sponges. These spicules principally belong to 

 tetractinellid and lithistid Sponges, but monactinellid and hexactinellid Sponges 

 are also represented. The spicules are figured and described, and reference is 

 made to the changes produced in their structures by fossilization. 



231. 1882-1885 Voshaee, G. C. J. Porifera (Bronn's Klassen und Ordnungen des 



Thier-Reichs, Lief. 1 — 11). 

 The work mainly treats of recent forms. The Porifera, fossil and recent, 

 are divided into two classes : (1) Porifera calcara, and P. non-calcarea. In this 

 latter are included (Order 1) Hyalospongiaa (= Hexactinellidse) ; (2) Spiculi- 

 spongias (= Lithistidae, Tetractinellidee, Myxospongice, Monactinellidce, pars) ; 

 (3) Cornacuspongias (= Monactinellidce, pars, Ceratospongias). Zittel's 

 classification is mainly followed in the subdivisions of the fossil forms. 



232. 1885 Feistmantel, Karl. Spongien-Reste aus silurischen Schichten von 



Bohmen {Sitzungsb. d. Konigl. bohms. Gesell. d. Wiss. in Prag. Jahrg. 



1884, p. 100). 

 Records the occurrence of detached complete six-rayed hexactinellid 

 spicules, in cherty rock of Lower Silurian (Cambrian ?) age in various localities 

 in Bohemia. 



