48 DlCTYOSPONGID^. 



28 George J. Hinde. A Monograph of tlie British Fossil Sporujes, Part 

 II, jyp. 93-188, pi ix. 



A description is given of the genus Dictyophyton (p. 126), and of D. 

 Danbiji, McCoy (sp.) (p. 128). It is observed "that the genns Tp;tragonis, 

 Eichvvald, is merely a synonym of Ischadites, Miirch., and its characters 

 markedly differ from those of Dictyophyton." 



1889. 



29. Charles E. Beecher. Brachiospongidce ; a Memoir on a group of 



Silurian Spoiujes. (Mem. Peabody Mus. Yale Univ. vol. 2, pt. 1, pp. 

 1-28, pis. i-vi.) 



Under the family Dictyospongid^, Hall, are included (p. 16) the genera 

 Protospongia and Cyaihophycus, together with Hydnoceras and its allies. 



30. J. W.. Dawson. New Species of Fossil Sponges from the Siluro-Camr 



hrian at Little Metis, on ilie Lower St. Laxorence / with notes hy Dr. 

 G. J. Hinde. (Trans. Roy. Soc. Canada, vol. VII, Sect, iv, jip. 81-55, 

 pi. iii.) 



In this work a number of remarkable forms of the PROTOspoNGiDiE are 

 described, together with other sponges whose structure is too imperfectly 

 known to ensure their position among recognized families. A distinction is 

 pointed out between the structure of Cyathophycus and the Uplmntwnia 

 (Phijsospomjia') Dawsoni, but that genus is ascribed to the Dictyospongid.e, 

 and referred to the sub-order iJictijonina. In a note upon page 39, Dr. IIinde 

 suggests that there is good reason for regarding Protosponcjia and allied 

 palaeozoic genera as Lyssacine, rather than Dictyonine hexactinellids. 



31. M. Neumayr. Lie Stamms des Thierreichs, p. 228. 



The author places Dictyophyton among the Dictyonine hexactinellids 

 but suggests that it may be Lyssacine. 



32. E. O. Ulrich. Preliminary Lescription of New Lower Silurian Sponges. 



(American Geologist, vol. 3, p. 233.) 



The species Pauffella filosa, Ulrich, of the Trenton group, which the 

 author here suggests may be a Dictyosponge, has not the characters of this 

 family. 



