38 BRITISH FOSSIL SPONGES. 



206. 1883 Roemer, Feed. Notiz iiber die Gattung Dictyophyton (Zeitsch. d. 



deutsch. Geol. Gesell., p. 704). 

 Points out the resemblance of Tetragonis Eifeliensis to the genus Dictyo- 

 phyton, and describes as new, Diet yophy ion Gerolsteinense, which appears to be 

 only the interior of Sphcerospongia 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. 



207. 1833 Walcott, C. D. Fossils of the Utica Slate (Transactions of the Albany 



Institute, vol. x). Paper stated to have been read March, 1879. 

 Cyaihophycus, subsequently recognised as a Sponge, is here described, 

 figured, and named as a genus of Algaa, of reticulate or plain structure, and 

 consisting of hollow membranous fronds (p. 18, PL ii, figs. 16, 17). 



208. 1883 Linck, G. Zwei neue Spongiengattungen (Neues Jahrb. fur Min., II 



Bel., lster Heft, pp. 59—62, Pis. II, III). 

 In one genus, Did y mo splicer a, 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. 



209. 1883 Barrois, C. Sur les Dictyospongidse des Psammites du Condroz (Ann. 



de la Soc. Geol du Nord, T. xi, pp. 80—86, PI. 1). 

 Describes and figures two species of Dictyophyton from the Upper 

 Devonian of the Ardennes, and places them as dictyonine hexactinellids. 



210. 1883 Hinde, G. J. Catalogue of the Fossil Sponges in the British Museum. 



pp. 1—248, Pis. I— XXXVIII. 

 Descriptions are given of the British species, and of new species from 

 foreign localities, which are figured. The classification of Zittel is followed. 

 The following new genera of monactinellids are proposed : Glimacospongia , 

 Lasiocladia, and Acanthorhaphis. The new genera of lithistids are Placonella, 

 Holodictyon, Pachypoterion, Nematinion, Bolospongia, Kalpinella, Thamno- 

 spongia, Pholidocladia, Phymaplectia, and Bhopalospongia. 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, Gincliderma, Plectoderma, Porochonia, 

 and Sclerolialia. The following genera of calcisponges are introduced : 



