120 A MONOGRAPH OP THE TERTIARY POLTZOA OP VICTORIA. 



spine articulated to a hollow process behind and a little below the margin. Branches 

 originating immediately below the thyrostome of a zocecium, usually the second. 



M.O. Living. Victoria. 



At once distinguished from all the other species by the single spine articulated 

 behind the thyrostome. The upper part and orifices of the zocecia also project 

 farther beyond the edge of the branch. 



7. C. tenuis, MeG. PI. XVI., fig. 7. 



C. tenuis, McG., P.Z.V., 39. 



Internodes with 4-8 zocecia, punctate. Zocecia very narrow, distinct, peristome 

 much produced and turned forwards and outwards ; thyrostome circular, unarmed. 

 Ocecia pyriform, with a distinct tubular opening. Branches originating from the 

 outer and posterior surface of a zocecium. 



M.C. Living. Victoria. 



I have onty the specimen figured, but there is no doubt of the identification. 



II. INARTICULATA. 



Zoarium continuous, not divided into internodes, erect, adnate or encrusting ; 

 radical tubes when present multilocular and calcareous. 



Family Idmoneid^. 



Zoarium erect, branched, branches distinct or anastomosing. Zocecia distinct, 

 opening on one surface only. 



Idmonea, Lamouroux. 



Zocecia arranged in parallel or subparallel rows, diverging on each side from the 

 mesial line. 



1. I. hochstetteriana, Stol. PI. XVI., figs. 12-16. 



Crisina hochstetteriana, Stol., Foss. Bryoz., Orakei Bay, p. 113 ; Idmonea 

 hochstetteriana, Waters, Q.J.G.S., 1884, 684. 



Zoarium irregularly branched ; branches triangular, with a smooth raised ridge 

 down the middle. Rows of zocecia alternate, considerably projecting. Zocecia 

 usually three in each lateral series, closely united and confluent, slightly produced 

 at the thyrostomes, whole surface anterior and dorsal, with numerous elongated pores 



