170 Proceedings of the Royal Society of Victoria. 



Clonograptus magnificus, Pritchard. 



Teiitnogrnptiis 7nagtiificus, Pritchard. Proc. Roy. Soc. Vic, 

 KS., iv., 1891, p. 58, pi. vi., figs. 1-3; andyo\. viii., 1894, p. 29. 



The gigantic size of the type specimen, about one metre in 

 diameter, is very remarkable. Fragments are not uncommon at 

 Lancetield, and I have seen a specimen, s.aid to be from Bendigo, 

 which I believe to be the same species. 



Clonograptus rigidus, J. Hall. 

 (PI. XVIII., Fig. 22; PI. XIX., Fig. 21). 



Graptolithus rigidus. Geol. Surv. Canada, Report for 1857, 

 p. 121 ; id. Grap. Quebec Group, 1865, p. 105, pi. xi., figs. 1-5. 



Branches numerous, of small diameter and fairly rigid becom- 

 ing somewhat flexible towards their extremities. Primary 

 branches from 1 to 1-5 mm. long and in a straight line; 

 secondary branches 4, or rarely 5 mm. long, branching at an 

 angle of from 90° to 120°; tertiaiy branches from 5 to 9 mm. 

 long, forming at an angle of from 60° to 90° with each other. 

 The subsequent branches diverge at an angle of about 30° or 40"^ 

 and usually are but slightly flexible. In some cases however, 

 probably from maceration, the whole hydrosome is so devoid of 

 rigidity that the branches as far down as the tertiaries are much 

 curved and tangled. The diameter of the branches is at first 

 about 0-5 mm., and evenly and gradually diminishes towards 

 their distal ends. Thecae 11 in 10 mm., slightly expanding; 

 apertural margin perpendicular to the branch ; outer margin 

 slightly concave, inclined at about 15°. 



Clonograptus kigidus, var tenellus, Linn;irsson. 

 (PI. XVIII., Figs. 23-25). 



Dichograptus tenelbis, Linnars. Of v. kon. Vet. Ak. Forh., Arg. 

 20, 1871, No. 6, p. 794, t. 16, figs. 13-15. 



Clonogroptus teneUus, Moberg. Sver. Geolog. Underscik. 

 Afhandl. och. Upsatter. C, 125, p. 3, t. 1, f. 1-3, 1892. 



Hydrosome slender, branches rigid, about 0-2 to 05 mm. 

 broad. Sicula small, a virgula 1 mm. in length occasionally 



