A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 15 



20. O. latifrons, n.sp. PI. I., fig. 31. 



Zooecia large, broad, ovate ; whole front occupied by a double series of tubes 

 diverging from a central line to the margin and separated by distinct wide grooves ; 

 a division of the tubes running down each side about mid-way between the central 

 and distal ends; lateral processes rather small, and with an avicularium opening 

 outwards; thyrostome large, arched and slightly pointed above, lower margin 

 straight and entire. Posterior surface convex, smooth ; on each side in the single 

 zooecia three depressions opening backwards and separated from the central tract 

 by a narrow raised line. 



S.P. 



This is a well marked and peculiar species. The tubes extend from the 

 central line to the circumference and are usually open in the outer part, although 

 occasionally that part is closed and there is a fissure in the central division ; the 

 grooves are frequently fissured in the central half. There is a continuous mark 

 down each side which gives the appearance of the tubes or pores consisting of two 

 series, especially marked when the inner portions of the grooves are fissured 

 through and the outer parts of the tubes are open. The geminate zooecia do not 

 show the posterior markings distinctly, but there is a series of depressions on the 

 outer edges similar to those on the single zooecia. 



21. C. auriculata, n.sp. PI. II., fig. 5. 



Zooecia elongated; an elevated scutiform area, with a row of about 5 large 

 pyriform fenestra on each side, directed from mesian line ; thyrostome lofty, 

 straight or slightly convex below ; above the thyrostome a vertical raised line on 

 each side of which is a dej)ression; lateral processes small, prominent, with a 

 distinct external avicularium opening outwards and slightly forwards ; a long 

 narrow depression on each side of the zooecium below. Posterior surface smooth 

 or faintly sulcate. 



M.C.; B. 



Allied to C. hastata, but much more slender and having the avicularian 

 processes small and ear-like. In most of the fossil specimens of C. hastata the 

 lateral processes are broken or worn off, so that they do not show their structure. 

 In the specimens of the present species they are beautifully perfect and quite 

 distinctive. 



22. C. stricta, n.sp. PI. II., fig. 6. 



Zooecia narrow, vase-shaped ; 5 pyriform fenestras ; a sub-fenestral plate 

 extending to the middle of the fenestras ; thyrostome lofty, straight and wide 

 below ; a vertical band upwards from the top of the peristome ; lateral processes 

 small, with a small avicularium on the outer edge opening directly outwards. 



