Notes oil Didyniograptiis caduceus, etc. 73 



The Synonymy may then be expressed as follows : — 



Didymograpttis cadiiceus, Salter. 



Didyniograptiis caduceus, Salter, Q.J.G.S., ix., 87, tig. 1, id. xix., 

 p. 136, figs. Via, h ; McCoy, Prodromus of the Palteonto- 

 logy of Victoria, Decade ii., pi. 20. 



Graptolithus bigsbyi, pars. J. Hall, Grap. Quebec Group, pp. 

 42, 87. 



Teiragraptus bryonoides, pars. Nicholson, Q.J.G.S., xxiv., pp. 131, 

 133; R. Etheridge, junior, Ann. and Mag. Xat. Hist., 4, 

 iv., pi. iii., figs. 3, 4. 



Didyniograptiis gibberiiliis, Nicholson, A.M.N.H., 4, xvi., p. 257. 



Teiragraptus caduceus, Herrmann, Nyt. Mag. for Naturvid, xxix., 

 translated in Geol. Mag., 1886; ?Brogger, Die Silurischen 

 Etairen im Christiania(i;ebiet. 



