A MONOGRAPH OF TUE TERTIARY POLYZOA OF VICTORIA. 45 



surface with irrcyular flattened ridges separated by shallow furrows and having a 

 row of round pores down tlie centre. 



M.C. ; L.B. ; AV.P. (W.) 



In one specimen there are some smaller rounded cells, situated at tlie base 

 of a zocvcium or vibracular cell, which probably also support vibracular. 



'■■a- 



2. L. canalicitlata, n.sp. PI. YIL, flg. 3. , .,,v. \ 



Zoarium discoid, slightly raised in tiie centre. Zooecia in regular lini^ajj. ''*' ^^<^ 

 radiating series, with well marked Avide viln-acidarian tracts between, elongatecl^~y^ ' 

 and somewhat quadrate ; margins thick and granular ; lower third of area tilled in 

 by a sloping granular lamina; ajjerture large, occupying two-thirds of the area, 

 the lower edge straight ; vibracularian tracts strongly granular, vibracular openings 

 much elongated, narroAV pyriform, the edges cremdated from the projecting 

 granulations. Dorsal surface with regular linear ridges, with a row of pores along 

 the centre, and separated by distinct sulci, the ridges alternately wider and narrower 

 corresjionding to the zoo^cial and vibracular series. 



L.B. 



This species is closely allied to the last, of Avliich it should perhaps be 

 considercred a variety, the chief difference being that the vibracularian cells are 

 arranged along distinct depressed tracts, which are also defined on the dorsal surface 

 of the zoarium. The intercalated series of zooecia seem always to commence with 

 and form a continuation of a series of one or two vibracular cells. 



3. L. nifeUa, Tenison Woods. PL VII., tig. 4. 



LuimlUes fCup/ilar/aJ r/ffella, Tenison Woods, I.e., p. 7. 



Zoarium large, discoid, raised and conical at the centre. Zoojcia in bifurcating 

 series radiating from the centre, mostly opposite, Avider at the base ; margins thick 

 and granular ; aperture occupying almost the whole area ; on the internal sloping- 

 surface near the anterior extremity are two large pits or ]wres and posterior to these 

 two or three other smaller round pores ; vibracularian cells between the zocecia and 

 opposite their anterior extremities. Dorsal surface irregularly divided by broken 

 I'adiating lines. 



S.P.; B.R.; G. ; L.B. 



Jj. aperta, so far as I can judge from the figure and description, seems to be a 

 worn state of the common form. 



