274 C. M. MapLestone : 



distally ; margins raised, broad, with a narrow inner rim ; a 

 small spine on each side near the distal end ; an ovoid avicu- 

 larium below. 



Locality. — Griffin's, Moorabool (Dr. Hall). 



The specimen consists of two zooecia only. Its chief pecu- 

 liarity is the asymmetrical form of the zooecia. one side is 

 slightly curved inwardly, the other side projects laterally, form- 

 ing an obtuse angle. The bases of the marginal spines are 

 preserved on the proximal zooecium only and on that one the 

 avicularium is broken off. 



Synaptacella crassimarginata, n. sp. (PI. XL., Fig. 21). 



Zoarium free, branching. Zooecia in single series, ovoid, 

 contracted proximally ; aperture oval, with very wide, raised 

 margins ; a large rounded depressed area in the proximal part 

 of the basal wall, and two small narrow ones distally ; a raised 

 ovoid avicularium below. 



Locality. — Griffin's, Moorabool (Dr. Hall). 



This specimen consists of three zooecia, the two distal ones 

 branching from the proximal one. 



Synaptacella ovalls, n. sp. (PI. XL., Fig. 18). 



Zoarium free. Zooecia in single series ; ovoid : aperture oval, 

 with a raised double margin ; an avicularium at each distal 

 angle, and sometimes one on an umbo below the aperture ; a 

 spine (?) above the centre of the distal edge of the aperture. 



Locality. — -Griffin's, Moorabool (Dr. Hall). 



This also is a small fragment, consisting of two zooecia only. 

 The aperture is a very regular oval ; the avicularia on the distal 

 angles are indicated by short tubular processes, which may be 

 the bases of pedunculate avicularia, and the process on the 

 distal edge of the aperture of the upper zoarium may represent 

 either the base of a spine or a small avicularium. 



Synaptacella dennanti, n. sp. (PI. XLL, Fig. 22). 



Zoarium free. Zooecia in single series ; ovoid, elongate, con- 

 tracted proximally ; aperture oval, occupying nearly two-thirds 



