70 A MONOGRAPH OF THE TERTIAEY POLYZOA OF VICTORIA. 



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

 Mivroporella symmetrica, Waters. Q.J.G.S., 1881, p. 332. 



Zoarium erect, very narrow, bilamiuate. Zocx3cia ovate, convex, distinct, the 

 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 helow ; on each side below the thyrostome an avicvdarium with 

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

 lower lip. 



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



6. A. clacata, Stoliczka, sp. PL IX., figs. 15-18. 



Fliisfrella clavata, Stol. Foss. Bryoz. der Orakei Bay, 139 ; .'' Esahara 

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

 clacata. Waters, (^J.G.S., 1881, p. 332 ; M. yarraensis, Waters. I.e., 1881, p. 31, 

 and 1882, p. 207 ; Adconellopsis parcipuncta, McG., T.R.S.V., 1885. 



Zoariimi forming narrow bilaminate branches. Zocucia separated by narrow 

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

 ment on one or l)oth 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.R. ; 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 descri1)ed as A. yarraensis by Waters there are three in a triangular 

 space. The front of the zoa-cium is occasionally convex and without depression, in 

 which case there are usually no zoo'cial pores, but in one convex specimen there are 

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

 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 

 zoreeia. These dilfereut forms occur in various combinations, and there are 

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

 A. parcipnucta sliews it to be identical with the present species and that the 

 suboral marks are avicularian. 



Family Lepraliida?. 

 Zoarium crustaceous, or erect and uni- or bilaminate or (U;ndroid or cylindrical. 

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



