112 A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 



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

 surface smooth or linely fibriUo-gi-auular, 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 zooucia ; angidar or rounded, usually finely 

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

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

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

 bottoms." — (McG. i/is.). 



B. ; M. llecent Victoria. 



1. L.porosa, McG. PL XXL, iig. 9. 



Zoariura discoid, convex with a dejDressed centre. Zoo^cia in radiating, slightly 

 curved rows ; a single series of zooecial apertures in caeli row. llows sometimes 

 bifurcating towards the ])eri})hery ; angle of the bifurcation occupied by one or 

 more series of zoiecia 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 sciittered. Near the centre of the zoarium peristome freely project- 

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

 ridges, some opening liigli up on the sides of the ridges. Apertiu'es rounded, placed 

 each at tiie base of a fuiuieUshaped depi'ession, the free edges of the latter marking 

 out polygonal areas from mutual contact. Surface microscopically pitted, liasal 

 lamina concentrically wrinkled. 



E. 



The single spceinicn is very convex, OAving to its attachment to a small cylin- 

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



5. L. wilsonl, McG. PI. XXL, figs. 10, 11. 

 Dlscupurella icllsoai, McG., T.Il.S.V., XXIL, 1886, p. 182. 



"Zoarium discoid, cupped, the basal lamina largt-, 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 ol)li([iie, opening 

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

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

 denticulate internallv. Otecium an inflation over the centre, covering wall divided 

 by numerous spiniferous reticulated fibrillar between which is a punctate or 

 perforated nu'nil)rane or (in the common form) with numerous small depressed areas 

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

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



M.C. llecent Victoria. 



