114 A MONOGRAPH OP THE TERTIARY POLTZOA OP VICTORIA. 



7. B. tessellata, var. benemunita, Hincks. PL XV., fig. 11. 



B. tessellata, Hincks, A.M.N.H., May, 1878; McG., P.Z.V., 99. 



I have a small, not very well-preserved fragment of a specimen 'which ought 

 probably to be referred to this species. The zooecia are irregularly shaped, broad 

 and rounded above, contracted below, with narrow raised margins ; the thyrostome 

 arched above, straight below, with a small elliptical avicularium placed transversely 

 on a slight elevation on the lower lip ; the marginal zooecia with several spines ; a 

 large immersed avicularium, with long triangular mandible, placed transversely 

 across the zocecium a little above the middle, and a few other minute avicularia 

 irregularly situated. Dorsal surface mapped into distinct areas, separated by narrow 

 sharp vibices and each containing one or more large avicularia similar to those on 

 the front of the zooecia. 



The specimen does not shew the thyrostome very clearly, but, so far as can be 

 made out, the upper angles of the zooecia at the sides are not produced and elevated 

 as in the recent form, in which also there is no oral avicularium. 



S.P. 



8. B. permwiita, n.sp. PI. XV., figs. 17, 18. 



Zoarium fenestrate ; fenestra? small, elliptical, about the same width as the 

 trabeculse. Zooecia elongated, separated by narrow raised lines ; thyrostome in 

 central zooecia with a distinct round sinus in the lower lip, in the lateral zooecia the 

 peristome produced, especially to one side, and lacerated or serrated for sjrines ; a 

 few scattered avicularia on the front of the zooecia on large mound-like elevations. 

 Ocecia rounded, convex, smooth, entire and subimmersed. Dorsal surface smooth, 

 divided into angular spaces by well-defined vibices ; numerous rounded or elliptical 

 avicularia in the spaces; and on the margins of the fenestras a series of large 

 avicularia, the fenestral extremity of which is raised and the mandible directed 

 away from the fenestras. 



M.C. 



Readily distinguished by the peculiar arrangement of the dorsal avicularia. 



9. B. monilifera, McG. 



B. monilifera, McG., T.E.S.V., 1859 and 1883; P.Z.V., 96, 97. 



Zoarium fenestrate ; fenestras oval, small, narrower than the trabecular ; 

 zooecia separated by narrow raised lines ; thyrostome with a sinus in the loAver lip 

 and a small avicularium (not well shewn in the fossils) on one side. 



S.P. ; M.C. A common recent Australian species. 



