}ieiv Victorian GraptoUte. 



129 



pages and in contemporary journals, in ■wliicli much attention 

 is given to the grouping of the cells on the stems and of the 

 stems with each other, I beg to send you a rough pen-and-ink 

 sketch of an arrangement of great beauty not shown by any 

 other species I have seen. Two specimens (one nearly perfect) 

 have been presented by M. Thureau, the discoverer, to the 

 National Museum at Melbourne, and are being figured in 

 detail for one of the forthcoming decades of my ' Palseontology 

 of Victoria.' 



This species will not quite fit into any of the newly sug- 

 gested genera of recent writers ; so I fall back for the present 

 on my old genus Didymograj)suSj with an extension which 

 might make it include all compound Graptolites having more 

 than one unbranched stem, with a single row of cells each, 

 arising from an uncelluliferous connecting basal tube or radicle 

 and funicle (including Loganograptus^ Dichograptus^ &c.). 



Didy))W(/rap^ut< Thiireiud (M'Coy), natural size. 



Didymograysus Thureaui (M'Coy). 



Sp>ec. char. Radicle conical, minute, in the middle of a short 

 straight funicle 1^ line long, which bifurcates equally at each 

 end, giving rise to the four equal main branches or stolons of 

 the compact polypidom ; each branch about 1 inch long, bent 

 regularly in zigzag angles of about 135°, alternately giving 

 off at intervals of about one line, on both sides from the salient 

 angles, the regular, straight, simple stems, five or six in number 

 on each side and about 1 inch in length (more or less as they 



