70 A MONOGRAPH OP THE TERTIARY POLTZOA OF VICTORIA. 



5. A. symmetrica, Waters, sp. PL IX., fig. 12. 



Microporella symmetrica, Waters. Q.J.Gr.S., 1881, p. 332. 



Zoariuin erect, very narrow, bilaminate. Zooecia ovate, convex, distinct, tlie 

 anterior part projecting forwards ; surface smooth or minutely granular ; usually a 

 row of small pits or pores round the margin ; a very large elliptical depression with 

 two or rarely three rows of stellate pores ; thyrostome arched above, straight or 

 slightly hollowed below ; on each side below the thyrostome an avicularium with 

 the mandible directed obliquely upwards and inwards and reaching the level of the 

 lower lip. 



S.P.; M.C.; B. ; B.K. ; Orphanage Hill, Geelong ; C.C. and W.P. (W.). 



6. A. clavata, Stoliczka, sp. PI. IX., figs. 15-18. 



Flustrella clavata, Stol. Foss. Bryoz. der Orakei Bay, 139 ; ? Eschara 

 lichenoides, Busk, B.M.C., Pt. II., p. 90 (not Milne Edwards) ; Microporella 

 clavata, Waters, Q.J.G.S., 1881, p. 332 ; M. yarraensis, Waters. I.e., 1881, p. 31, 

 and 1882, p. 267 ; Adeonellopsis parvipuncta, McGr., T.R.S.V., 1885. 



Zoarium forming narrow bilaminate branches. Zooecia separated by narrow 

 raised lines, ovate, elongated, anterior extremity raised ; a smooth nodular enlarge- 

 ment on one or both sides (occasionally absent) ; thyrostome rounded above ; two 

 rounded pores (avicularian) below the thyrostome ; anterior surface rarely convex 

 and entire, usually depressed with a single pore or cluster of small stellate pores. 



S.P. ; M.C. ; B.B. ; C.C, B. and W.P. (W.). Living. Australia. 



This is a very variable species. Sometimes there is a single suboral round pore, 

 and in the form described as A. yarraensis by Waters there are three in a triangular 

 space. The front of the zooecium is occasionally convex and without depression, in 

 which case there are usually no zocecial pores, but in one convex specimen there are 

 clusters of three or four small stellate pores. In one of the specimens with 

 depressed front there is a vertical row of two or three round pores ; in many there 

 is a single large entire pore ; while again there is frequently a cluster of small 

 stellate pores. There is occasionally a pore, no doubt avicularian, at the base of the 

 zocecia. These different forms occur in various combinations, and there are 

 frequently several in the same specimen. An examination of calcined specimens of 

 A. parvipuncta shews it to be identical with the present species and that the 

 suboral marks are avicularian. 



Family Lepraliidae. 

 Zoarium crustaceous, or erect and uni- or bilaminate or dendroid or cylindrical. 

 Zocecia horizontal, calcareous and destitute of membranous area, entire or variously 



