[Pkoc. Koy. Soc. Victoria, 31 (N.S ), Part II , 1919J. 



Aur. X. — New or Little-known Victorian Fossils in the 

 National Museum. 



Part XXII. -Palakozoic Worms; with kvidkncb op Soft Parts. 



By FREDERICK CHAPMAN, A.L.S., <fec. 

 (Palaeontologist to the National Museum, Melbourne). 



(With Plates XIII. and XIV.). 



[Read 8th August, 1918]. 



Introduction. 



This paper is largely concerned with the relationship of the 

 genus Trachyderma, Pliillips, previously discussed in this series,^ 

 as seen in the light of some more or less recent discoveries of re- 

 markable, well-preserved gill-plunies (prostomial appendages) of 

 these worms. It thus fairly establishes the claim of these fossil 

 worms, fornierly described by Phillips, Salter, Cowper Reed and 

 the writer, to belong to the Chaetopoda and having affinities with 

 the Cryptocephala, to which the sabellids and serpulids are 

 referred by Dr. B. Benham.2 



The fleshy appendages of the Victorian Silurian worms, as here 

 understood, have generally been referred by collectors to " fucoids," 

 and it was only by the discovery of better-preserved specimens,, 

 and their association witli tubes of Trachyderma, that their true 

 relationship was conclusively made out. 



The latter part of this paper deals with the genus Cornulites^ 

 and tlie description of a new species in Victoria. So rare is this 

 genus in Australia that only one other species appears to liave 

 been previously known, namely, C. fasjna?iicits, described by R. 

 Etherid^'^e, junr., from Heazelwood and Zeehan, Tasmania. 



PHYLUM VERMES. Class CHAETOPODA (Biistle-wonns). 



Subclass PoLYCiiAETA (Marine-womis). 



Yum. Trachydermidae, Chapman. 



Genus Trachyderma, Phillips, 1848."^ 



iVofes OH tht Genus. 



Phillii»s founded this generic type on the "external case or tube 



(aiiala;^^ous to the 'shell' of Serpnla and Spirorhls). 



1 These Proreedin^rs, vol. xxii. (N.S.), pt. ii., 1910, pp. 102-105. 



2 Cambridge Nat. Hist,, vol. ii., ISW. Polvchaete Worm?. 



3 Mem. Oeol. Surv. (Jt. Brit., vol. ii., pt. i., 1848, p. 3:!1. 



