GG A MONOGllAPH OF Till': TEUTIAUV POLYZOA OF VICTORIA. 



contracted below. ])oristnm(^ tliickoiiod ;m(l pvoj(>cting, graiiulo-puuctate like the 

 .surface. 



S.P., a single zocecium. 



Tcssaradoma, Norman. 



Zoariinii encrustino- or foliaceons and iiiiilaminate, or erect and ramose. 

 Zn(ecia Avitli the peristome produced and tnrn(>d forwards in a lii])iilar or sul)lul)nlar 

 manner; a median tuhular zocecial pore (trypa). 



The genus Tessaradoma Avas originally proposed by Norman for Busk's 

 Onchopora borealis, a sjjecies snbsecjuently included, as well as T. magnirosfris, 

 by Ilincks in Porina. I have already (C.V.) proposed that those species agi'eeing 

 Avith Porina in otJier res])eets but dill'ering in th(> anterior pore, ojxMiing dii'ectly 

 into the body cavity shoidd l)e includcMl in Tessaradoma, while those in which the 

 pore is extei*nal or pcristomial should be referred to Porina. 



1. T. magnirosfris, McG. PI. IX., fig. 10. 



Lfipralia magnirosfris, McG., T.E.S.V., Oct. 1882; Tessaradoma, id., McG., 

 P.Z.V. 175; Porina magnirosfris, Ilincks, A.M.N. II, Oct. 1881; MicroporeUa 

 infroversa, Water.s, Q.J.G.S., 1882, p. 268. 



Zooicia indistinct; surface with numerous large rounded pores, excejit in the 

 neighbourhood of the thyrostome; thyrostome arched above, nearly straight below; 

 pcri-stome thickened and raised ; a large sessile avicularium on one or both sides of 

 the zoceciuin about the middle, Avitli the triangidar mandible directed straight 

 outAvards and encroaching on the adjaci'nt zocjecium. 



S.P. ; M.C. Living. Australia. 



*»• 



2. T. elevafa. Waters, sp. PI. IX., fig. m 



? IJschara efcrafa, Tenison AVoods, T.P.S. N.S.W., 187G, p. 118; Microporefla 

 elevafa, Waters, Q.J.G.S., 1881, p. ;r30. 



Zoarium ex])anded, or lobed and l)ilaminate, or cylindrical, traversed by 

 numerous anastomosing sharply raised ridges, inclosing angular depressed spaces 

 in which are several irregularly shaped pores; usually one of these ridges 

 surrounding the thyrostome; thyrostome (secondary) Avith the peristome thick, 

 tubular and directed vertically forAvards ; usually several pores round the base of 

 the peristome and opening into its chamber; a zocecial jiore (jiot ahvays distingiush- 

 able externally from the other pores) some distance below the thyrostome; numerous 

 rounded avicularia, Avith the mandibular transverse bai- avcU marked at the anas- 



