8 Proceedings of the Royal Society of Victoria. 



D. GRANDE (n. sp.) 



Polyp-stock large, flat, with pei-haps the exception of the 

 central portion, which, judging from the distorted condition 

 in which it is preserved, was slightly cup-shaped. The 

 centre is formed by a thread about 2 nnn. in length. From 

 each end of this are given off two branches, which, at about 

 1 mm. from their point of origin, bifurcate nearly at right 

 angles, thus producing eight branches. The outer edges ot 

 the branches forming the right angles are straight, and at 

 about 5 mm. from their origin imite, enclosing an elongated 

 fenestrule. The inner edges curve sharply and unite, 

 enclosing a circular fenestrule about 8 mm. in diameter. 

 After this, branches about ] mm. wide radiate in ever}^ 

 direction from the centre, branching dichotomously as they 

 go, and no anastomosis occurs. The branches are united by 

 cross bars which as a rule run nearly at right angles to them, 

 but are in a few cases oblique. The bars are broadened at 

 their junction with the branches, as in the Canadian species 

 described by Prof James Hall (Can. Org. Rem., Dec. II), 

 and are about 1 mm. wide at their middle. The cross bars 

 cease their appearance at from 2 to 4 cm. from the distal 

 end of the branches which then become very flexible and 

 attenuated. The distance between two adjacent bifurcations 

 of the same branch varies from about I'o to 7"o cm. The 

 fenesti-ules enclosed by the radiating branches and the cross- 

 bars are generally about 5 mm. wide, and vary from o to 25 

 mm. in length, those towards the centre being smaller and 

 more circular in outline. 



The diameter of a perfect specimen has not been deter- 

 mined, and the hydrotheccS are not visible in any of the 

 specimens. 



My best thanks are due to Professor W. Baldwin Spencer 

 for his advice during the preparation of this paper. 



Description of Figures. 



1. Central portion. 



2. Fragment showing termination of branches. 



3. Central portion of another specimen. 



The flofures are natural size. 



