new Victon'on Oraptolite. 



129 



pages ami in contenijxtrary journals, in whicli much attention 

 18 given to the gn)U|)ing of the cells on the stems and of the 

 stems with each other, 1 beg to send you a rough ])en-and-ink 

 sketch of an arrangement of great beauty not shown by any 

 other species 1 have seen. Two specimens (one nearly perfect) 

 have been ])resL'nted by M. Thureau, the discoverer, to the 

 National Museum at Melbourne, and are l)eing figin-ed in 

 detail lor one of the forthcoming decades of my ' PaUeoutology 

 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 mv old genus DiJi/)nor/rupsus-j with an extension which 

 might make it include all compound CTr.i[)tolites having more 

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

 arising from an uncelluliferous connecting basal tube or radicle 

 and funicle (including fjoganograptun, Dichograptus, &c.). 



Difli/vifit/rapsii.s Thiircfud (M'Coy), natural s:zo. 



Didijiiiograpsiis Thurcaui (M'Coy). 



F>pcc. char. Kadiclc conical, minute, in the middle of a short 

 straight funicle 1^ line long, which ijifurcates e([ually at each 

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

 the com])act polypidom ; each branch about 1 inch long, bent 

 rcgularlv 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 sterns, five or six in number 

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



