FOSSIL CORALS AND POLYZOA. 
TETRAPLARIA, nov. gen. 
P. with cylindrical smooth branches. Cells back to bae 
Sachin oe the the opposite pairs of two sides alternating ati 
‘the oth 
TETRAPLARIA AUSTRALIS, nN. s. 
P. with smooth slender —-! Cells elongately pyriform, 
not punctate ; aperture nearly ov 
uddy ‘reek, Western Victoria. '—The occurrence of a fossil 
genus 
cene or living representa- 
tive, is another link in the chain of evidence which fixes the’ age 
eds. 
of these 
EXPLANATION OF PLATE. 
Fig. 1a. ea oe tg discus, ao a 
1b. it li 
oo ee oa 
2a. ADEs atte Sinierwnak much enlarged. 
2b itto calice 
a 3a. Trochocyathus heterocotatns, enlarged 
view, showi ing peculiar costa. 
4a. Tetraplaria australis, pe terk 
4b Ditto tan 
