38 
BRITISH FOSSIL SPONGES. 
206. 1883 Roemer, Ferp. Notiz iiber die Gattung Dictyophyton (Zeitsch. d. 
207. 
908. 
209. 
210. 
deutsch. Geol. Gesell., p. 704). 
Points out the resemblance of Tetragonis Hifeliensis to the genus Dictyo- 
phyton, and describes as new, Dictyophyton Gerolsteinense, which appears to be 
only the interior of Spherospongia tessellata, Phill. sp. The author doubts 
that these fossils can have been siliceous Sponges, since their siliceous skele- 
tons would have been preserved, but thinks that probably they may have 
possessed skeletons of a horny character like the existing Gorgonias. 
1883 Watcort, C. D. Fossils of the Utica Slate (Transactions of the Albany 
Institute, vol. x). Paper stated to have been read March, 1879. 
Cyathophycus, subsequently recognised as a Sponge, is here described, 
figured, and named as a genus of Alew, of reticulate or plain structure, and 
consisting of hollow membranous fronds (p. 18, Pl. ii, figs. 16, 17). 
1883 Linck, G. Zwei neue Spongiengattungen (Neues Jahrb. fiir Min., IL 
Bd., 1lster Heft, pp. 59—62, Pls. II, III). 
In one genus, Didymosphera, the skeletal spicules consist of twin nodes 
connected by a straight rod with axial canal, and there are from three to five 
rays given off from each node. This form is considered as the typical 
elementary spicule of the Anomocladina family. The spicules become modi- 
fied so as to resemble those of the Rhizomorina family. The other genus has 
spicules of the Rhizomorina type; it is named Polyrhizopora. 
1883 Barrors, C. Sur les Dictyospongides des Psammites du Condroz (Ann. 
de la Soc. Géol. dw Nord, T. xi, pp. 80—86, Pl. 1). 
Describes and figures two species of Dictyophyton from the Upper 
Devonian of the Ardennes, and places them as dictyonine hexactinellids. 
1883 Hinpr, G. J. Catalogue of the Fossil Sponges in the British Museum. 
pp. 1—248, Pls. I—XX XVIII. 
Descriptions are given of the British species, and of new species from 
foreign localities, which are figured. The classification of Zittel is followed. 
The followmg new genera of monactinellids are proposed: Climacospongia, 
Lasiocladia, and Acanthorhaphis. The new genera of lithistids are Placonella, 
Holodictyon, Pachypoterion, Nematinion, Bolospongia, Kalpinella, Thamno- 
spongia, Pholidocladia, Phymaplectia, and Rhopalospongia. The genus Astylo- 
spongia is placed provisionally in the Hexactinellida, but it is suggested that 
its minute structure resembles more closely that of the Anomocladine 
lithistid, Cylindrophyma. The new genera of hexactinellids are Strephinia, 
Sestrodictyon, Sestrocladia, Placotrema, Cincliderma, Plectoderma, Porochonia, 
and Scelerokalia. The following genera of calcisponges are introduced : 
