*-^ 



A MONOGUAPn OF THE TERTIARY POLYZOA OP VICTORIA. 85 



I have only a few small imperfect fragments. It is distinguished by the wide, 

 very narrow sinus occupying almost the whole width of the lower lip. It may be 

 doubted whether it should not rather be referred to Lepralia. 



15. S. rklleyl, McG. PL XL, fig. 18. ^ - ^^^^ 



Schisoporella marsupium, Ridley, Pr. Zool. Soc. Lond., Jan., 1881 ; S. rkllei/l, h>j^'<9 - j, 

 McG., P.Z.V., 138. ^; 5- ^xU* 



Zoariuui encrusting. Zoo^cia distinct, smooth or aroolated at the margins ; w„n,t/- 

 thyrostome large, semicircular, contracted below, with a small rounded sinus in the 

 straight lower lip ; below the thyrostome a smaU avicularium on a large rounded 

 elevation. Ooecia large, rounded. 



M.C. Living. Patagonia and Australia. 



16. -S*. arachnoides, McG. PL XL, fig. 19. 



Schisoporella arachnoides, McG., P.Z.V., 138. 



Zoarium crustaceous. Zooicia ovate, distinct, convex, smooth ; thyrostome 

 semicircular, straight below, with a distinct, rounded sinus ; several (six or seven) 

 round the sinus, of which the loAver on each side are a little removed from its margin. 

 Ooecia (in recent specimens) rounded, smooth, the edges usually sculptured. 



M.C. Living. Australia. 



Only the single imijcrfect specimen figured in Avhicli the characters are not 

 well marked. I have, however, no doubt of the identification. 



17. S. Maperta, Michelin, sp. PL XL, fig. 20. 



Lepralia hiaperta. Busk, Crag. Pol., 37 ; Hippothoa hlaperta, Smitt, P.B., 46; 

 id., n. divergens. I.e., 17; Schisoporella hiaperta, Hincks, A.M.N.H., July, 1881, 

 May, 1884. 



Zoarium encrusting. Zooecia broad, distinct, smooth, very slightly convex ; 

 thyrostome semicircular, contracted below and with a narrow slit-like sinus ; on one 

 side of the thyrostome a large bullate eminence on the upper part of which is an 

 avicularium with the narrow mandible directed downwards. 



M.C. Living. Arctic Seas, England, North America, Australia. 



18. S. convexa, n.sp. PL XL, fig. 21. ., 



Zoariiim encrusting. Zooecia hexagonal, distinct, convex, siirface smooth or 

 slightly granular ; a series of small areolations round the margins ; thyrostome 



