112 A MONOGRAPH OP THE TERTIARY POLTZOA OP VICTORIA. 



stomes with two sharp processes Avith a sinus between, or divided into several spines; 

 surface smooth or finely fibrillo-granular, with numerous long acicular spines 

 projecting at right angles. Cancelli numerous in the centre and in one or more 

 rows or irregularly placed between the zooecia ; angular or rounded, usually finely 

 denticulate and frequently with several sharp spines from the edges. Ooecium 

 formed by a thin inflation commencing at the base of the rays and covering the 

 centre ; surface punctate, the large puncta with smaller perforations at the 

 bottoms."— (McG. ms.). 



B. ; M. Recent Victoria. 



1. L. porosa, McG. PI. XXI., fig. 9. 



Zoarium discoid, convex with a depressed centre. Zooecia in radiating, slightly 

 curved rows ; a single series of zocecial apertures in each row. Rows sometimes 

 bifurcating towards the periphery ; angle of the bifurcation occupied by one or 

 more series of zooecia arranged in a V-shaped manner, the base of the V pointing 

 inwards. Towards the periphery the rows lose their individuality and the zooecia 

 are irregularly scattered. Near the centre of the zoarium peristome freely project- 

 ing, towards the margin flush. Cancelli in two or three irregular rows between the 

 ridges, some opening high up on the sides of the ridges. Apertures rounded, placed 

 each at the base of a funnel-shaped depression, the free edges of the latter marking 

 out polygonal areas from mutual contact. Surface microscopically pitted. Basal 

 lamina concentrically wrinkled. 



B. 



The single specimen is very convex, owing to its attachment to a small cylin- 

 drical foreign body, apparently the anchoring tubes of another polyzoon. 



5. L. wilsoni, McG. PL XXI., figs. 10, 11. 



Discoporella wilsoni, McG., T.R.S.V., XXII., 1886, p. 182. 



" Zoarium discoid, cupped, the basal lamina large, and usually much upturned 

 at the margin ; centre depressed. Zooecia in regular radiating rows, closely adnate 

 or basally connate, very lofty at the centre, granular ; orifice oblique, opening 

 distally; peristome usually produced into two stout lateral spines, occasionally 

 divided into several. Cancelli large, angular, one or two rows between the zooecia, 

 denticulate internally. Ooecium an inflation over the centre, covering wall divided 

 by numerous spiniferous reticulated fibrillse between which is a punctate or 

 perforated membrane or (in the common form) with numerous small depressed areas 

 at the bottom of which are minute perforations ; duct a short thick tube, internally 

 denticulate, opening laterally." — (McG. ms.). 



M.C. Recent Victoria. 



