A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 95 



pyriforui, with a large median denticle ; peristome much thickened, little elevated, 

 smooth, forming a spout-like sinus below ; no avicularia in the specimen. 



B. 



I have only a minute broken fragment from which it is impossible to be certaiT\o\'>^ ' '^'■'/^/a 

 of the mode of growth, but I think it is bilaminate. There are no avicularia in 'the pi 

 specimen, but there can be no doubt that it belongs to Smittia. ^^Uch^>j^''-' 



11. *S'. bi-incisa, Waters. PI. XII., flg. 21. 



Smittia bi-iiicisa, Waters, Q.J.G.S., 1882, p. 272. 



Zoarium encrusting, zocecia ovate, distinct, convex, witli numerous large pores ; 



thyrostome arched above, with about seven spines on the upper lip, lower lip with a 

 prominent squared median denticle and a sharp triangular tooth on each side ; on 

 each side of the thyrostome frequently a thick tubular process surmounted by a 

 rounded avicularium ; and a prominence below the thyrostome also supporting an 

 avicularium, 



S.P.; M.C. 



The lateral avicularia are frequently absent, as is also occasionally the suboral. 



12. S. tatei, Tenison Woods, sp. PL XII., figs. 2(V29. 



Escliara tatei, Tenison Woods, T.R.S.N.S.W., 1876, p. 149 ; E. porrecta, id.. 

 I.e., p. 147 ; Smittia tatei, Waters, Q.T.G.S., 1881, p. 337 ; id., 1882, p. 371. 



Zoarium erect, bilaminate, branched and divided into narrow lobes or cylindrical. 

 Zooecia very long and narrow, of nearly uniform width throughout, with prominent 

 raised margins having a narrow groove between those of contiguous series ; a row of 

 rounded pores down each side, frequently in a groove, and occasionally others 

 between ; thyrostome arched above with a sinus below, a squared median denticle 

 and a small pointed tootli on either side ; peristome usually becoming very mucli 

 raised, projecting forwards and uniting across the upper ])art of the sinus so as to 

 form a large peristomial pore ; frequently a median avicularium below the tbyro- 

 stome, with the long mandible directed vertically dowuAvards. Orecium small, 

 rounded, punctate, with a raised surrounding rim. 



S.P. ; M.C. ; B. 



I was at first inclined to refer this species to Porina, from the presence of the 

 suboral peristomial pore, but an examination from behind shewed in some zoix'cia a 

 median denticle and two small lateral teeth. Tbe suboral pore is formed by tlie 

 peristome sending a process forwards on each side, arching over the sinus and 

 coalescing in the centre. 



