Tertiary Polyzoa of Victoria. 269 



level with the proximal margin of the ooecial opening on each 

 side, leaving a depressed triangular area between ; a large 

 slightly depressed pyriform area on each side beyond the 

 ridges. Ooecial opening large, transversely elliptical : a single 

 rounded foramen below it on a slightly elevated umbo on the 

 median line. Dorsal surface smooth, with two very slightly 

 raised narrow ridges descending from the apex with a hastate 

 depressed area between ; at the proximal end of which there is a 

 subtriangular area very slightly calcified and almost transparent. 

 Around the sides and crossing over near the apex is a narrow 

 ridge, probably the dorsal margin of the depressed areas seen 

 on the front view. Zooecia unknown. 



Locality. — Campbell's Point (J. F. Mulder). 



The slide upon which these two specimens are, was given to 

 me by Mr. Mulder, and I consider them as exhibiting the frontal 

 and dorsal aspect of the one species, though not having exactly the 

 same outline ; the difference is not more than can be seen in the 

 ooecia of other species of Catenicellidae, and as the dorsal sur- 

 face has a somewhat depressed triangular area similar to that 

 on the frontal surface I do not think there can be any doubt 

 about it. The small i^ound foramen on the raised umbo is 

 analagous to that occurring on the frontal ridge of the zooecia of 

 the other species of SfrophijJora. 



Stmphipora laevis, n. sp. (PI. XXXVITL, Fig. 10). 



Zooecium ovate, smooth. Thyrostome large, suborbicular ; 

 proximal margin with a broad, fiat, protruding denticle. The 

 central portion of the zooecium bears a slightly raised ridge 

 extending from the thyrostome to near the proximal part, 

 with a pore below the thyrostome. A curved spinous process 

 on each side extending to the distal end of the zooecium. 



Locality. — Mornington (Dr. Hall). 



A single specimen. The zooecium is veiy smooth and the 

 ridge in the centre is very slightly laised, but its presence and that 

 of the jiore show it to be a Strophipora though these character- 

 istics are less marked than in the other species. The curved 

 spinous processes arching over the distal part are peculiar to 

 this species. 



