fj08 T. ^. Hall: 



tlieii different angle of divergence. I have previously recorded it 

 as D. cf. tiifholsoiii . It is associated Avitli TctrtK/raptns pendens, 

 'Goniograptiis thureivni, etc. 



Locrt/i^i/.— Daylesford (T. S. Hart, Loc. No. :}. 1908, Type), 

 J^endigo (Min. Dep., Nos. 4191, etc.). 



Horizon . — l^ppcr Bendigonian. 



DlDVMOGKAPTUS BIFIDU.S J. Hall. (PI. XVII., Fig. 11). 



(rrdpfolithus hifidus J. Hall. Grap. Quebec Group, p. 73, 



pi. 1. fig. 16-18. pi. 3. fig. 9, 10. 

 Did t/niotivapfus hifidu-s Elles and Wood. Mon. Brit. Grap., 



1901, p. 42, pi. 4, f. la-lf. 

 Didymofirapfits hifidiii^ Ruedenianii. (xrap. N. York. pt. 

 1, p. 689. 

 Branches of hydrosome 10 to .30 mm. long, slightly increasing 

 in width for the greater part of their length. Dorsal margin of 

 branch straight, thecal margin curved. Branches diverging usually 

 -at from 20° to 30o, but the angle sometimes greater in a small 

 variety. Thecae 11 or 12 in 1 cm., inclined at from 30^ to 50^, 

 four times as long as wide, free for nearly half their length. Aper- 

 tural margin normal to the axis of the branch, concave, with a 

 slightly mucronate denticle. 



The description is drawn up from Victorian specimens. 1 have 

 previously recorded D. nn/rrhisoni from Basin Creek, (V)imadai, 

 but am of opinion that the single specimen on which the iec<»-d was 

 founded is D. hifidus, and that I have not seen D. miirrliiaoni . 



Locality. — Wattle Gully, etc., Castlemaine, Basin Crick. Coi- 

 inadai, Tarilta, Daylesford (T. S. Hart), Steiglitz, Bendigo. 



Horizon. — Confined to the lowest zone of the Castlemainiaii and 

 uppermost zone of the Bendigonian. 



T)idvmo<;haptus caduceus var. manubkiatus var. nov. (PI. XVII., 

 Figs, 12, 13). 



Diffeis from the typical form by the immense size of the sicula, 

 whieli at tlie point of sei)aration of tlic l)raiiches is as wide as the 

 braiicii itself. Tliccae 10 in 1 cm. Blanches diverging at 1-300 to 

 14(lo. and varying from 2 to 3 mm. in width. Tliei'c is consider- 

 •abU- linigc ill the widtli of the branehes. ainl tlie angle of diver- 

 -geiiee. bul the great size of the sicula is reinarkahle. Tlie variety 

 iis citniinon at tlie recorded localities. 



