80 A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 



])romino,ut half of tlu; zocecium; outer edge of zoa'cium producod at the upper anisic 

 and liaving a small sessile aviculavium on the edge looking directly outwards ; helow 

 this avicularian process a small sharp point formed hy a narrow raised ridge 

 extending from the autcrior vitta haclvAvards; thyrostome large, twice as high as 

 wide, rounded ahove, slightly hollowed helow, contracted at the junction of the 

 middle and lower thirds, directed o])liqnely, the loAver lip heing to the outside ; an 

 avicularium on th(> raised inner portion of the zocrcium close to the upper part of 

 the thyrostome. Posteriorly a vertical raised band running along the centre of the 

 branch, with ci'oss bauds marking the bouiularies of (h(> zod'cia, and others similar 

 •i-oin"- to the anterior vittate band, and at the passage round the edge forming the 

 projection below the lateral avicularian process. 



M.C. 



Eamily Schizoporellid^. 



Zoarium crustaceous or expanded and uni- or bilaminate, or dendroid or 

 cylindrical; or discoid, unilaminate and free. Zofecia calcareous, destitute of 

 membranous area, entire or variously punctured, but Avithout special pores ; 

 thyrostome rounded above, with a distinct notch or sinus in the lower liji ; no 

 special development of the peristome. Ooecia external. 



Schizoporella, Hi neks. 



Zoa?cia closely adherent to each other; thyrostome semicircular or suborbicular, 

 having a notch or sinus in the lower lip ; avicularia lateral or suboral, mandible 

 variously shaped, not vibraculoid. Ooecia entire in front. 



1. S. cecilii, Audoin, sp. PI. XI., fig. 1. 



Lepralia cecilii, Busk, Q.J.M.S. V. 173 ; McG., P.Z.V., 35 ; Schizoporella 

 cecilii, Hincks, B.M.P., 269. 



Zoarium encrusting. Zooecia broad, ovate, rhomboidal or hexagonal, distinct, 

 with slightly raised margins ; anterior surface slightly convex, Avith numerous 

 X'ound punctures, the central portion being usually clear and smooth or umbonate ; 

 thyrostome nearly terminal, semicircular, Avith a ratlun* uarroAV sinus in the lower 

 lip ; peristome slightly raised above. Oascia large, rounded, slightly granular. 



B. A widely-distributed living species. 



2. S. p/ii/wa(opora Reuss. PI. XL, figs. 2, 3. 



SchizopurclUi phtjmalopora, AA^aters, Q..T.G.S., 1881, p. 338. 



Zoarium cylindrical, branched. Zooecia alternate in linear series, irregularly 

 ovate, with sharply-defined raised margins, upper part slightly raised and turned 



