80 A MONOGRAPH OF THE TERTIARY POLTZOA OP VICTORIA. 



prominent half of the zooecium ; outer edge of zooecium produced at the upper angle 

 and having a small sessile avicularium on the edge looking directly outwards ; below 

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

 extending from the anterior vitta backwards ; thyrostome large, twice as high as 

 wide, rounded above, slightly hollowed below, contracted at the junction of the 

 middle and lower thirds, directed obliquely, the lower lip being to the outside ; an 

 avicularium on the raised inner portion of the zooecium close to the upper part of 

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

 branch, with cross bands marking the boundaries of the zooecia, and others similar 

 going 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. Zocecia calcareous, destitute of 

 membranous area, entire or variously punctured, but without special pores ; 

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

 special development of the peristome. Ooecia external. 



Schizoporella, Hincks. 



Zooecia 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. PL 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, with numerous 

 round punctures, the central portion being usually clear and smooth or umbonate ; 

 thyrostome nearly terminal, semicircular, with a rather narrow sinus in the lower 

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



B. A widely-distributed living species. 



2. S. phymatopora Bcuss. PI. XI., figs. 2, 3. 



Schizoporella phymatopora, Waters, Q.J.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 



