A MONOGRAPH OF THE TERTIARY POLTZOA OP VICTORIA. 95 



pyriform, with a large median denticle; peristome oiuch thickened, little elevated, 

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



B. 



I have only a minute broken fragment from which it is impossible to be certain 

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

 specimen, but there can be no doubt that it belongs to Smittia. 



11. S. bi-incisa, Waters. PL XII., fig. 24. 



Smittia bi-incisa, Waters, Q.J.GLS., 1882, p. 272. 



Zoarium encrusting, zooecia ovate, distinct, convex, with 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. 26, 29. 



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

 I.e., p. 147 ; Smittia tatei, Waters, Q.J.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 tooth on either side ; peristome usually becoming very much 

 raised, projecting forwards and uniting across the upper part of the sinus so as to 

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

 stome, with the long mandible directed vertically downwards. Ooecium small, 

 rounded, punctate, with a raised surrounding rim. 



SP. ; 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 zooecia a 

 median denticle and two small lateral teeth. The suboral pore is formed by the 

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

 coalescing in the centre. 



