Art. I. — Further Descriptions of the Tertiary PolyzQp,::;nfp-^^-,^ 



Victoria.— Part IV. A^^i^AC> 



By C. M. MAPLESTONE'. /<^/^ -*>*'*- V,^'^' 



(With Plates I. and II.) 

 [Eead 19th, April, 1900.] 



Cellaria biaperta, n. sp. (PI. I., Fig. 1) 

 Zooecia obscurely hexagonal, almost diamond-shaped, with 

 linear margins which are sometimes straight longitudinally 

 for a short distance between the zooecia ; thyrostome semi- 

 circular, above the middle of the zooecia, two denticles in the 

 lower margin ; at the apex of the zooecia a somewhat semi- 

 circular opening (ovarian ?) ; avicularia triangular, with rounded 

 angles, cucullate, with a deep oval cavity. 

 £om/iij.— Muddy Creek (T. S. Hall). 



A single zoarium. The zooecia are pointed at the distal and 

 proximal ends ; the semicircular opening which is present in 

 almost every zooecium may, I think, be ovarian. It is allied to 

 C. laticellay but the avicularium is different, and this feature is 

 now recognised as the most distinctive characteristic in Cellariae. 



Cellaria biseriata, n. sp. (PI. I., Fig. 2). 



Zoarium in flat internodes composed of two rows of zooecia on 

 each face. Zooecia subtriangular ; surface smooth ; margins 

 linear, raised ; thyrostome close to distal end, semicircular ; two 

 denticles in lower lip ; a small crescentic lobe projecting under 

 the distal margin. 



Locality. — Grice's Creek, Mornington (T. S. Hall). 



A single specimen in good preservation. The zoarial and 

 zooecial characters are very distinctive. 



Membpanipora spiculifera, n. sp. (PI. I., Fig. 3). 

 Zoarium cylindrical, dichotomously branched. Zooecia oval, 

 area large ; margin narrow, raised, with a series of small 

 mamillae, probably the bases of spines ; ooecia globose, with 

 subtriangular area in front. 



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