NOTES ON A COLLECTION OE TERTIARY LIMESTONES. 
Otway beds (Janjukian). It also occurs in the Lower Aldingan 
beds, and the higher zones of the Balcombian, as at Bairnsdale, and 
has also been recorded from Beaumaris (Kalimnan). 
Found in the polyzoal rock. 
Spines of Echinoids. 
(Plate VII., Fig. 5 a.) 
Several varieties of echinoid spines are met with in thin sections 
of the polyzoal rock. In their asperous surface and average dimensions 
they resemble the smaller secondary spines of the Cidaris type. 
CHAETOPODA. 
Spirorbis sp. 
Two of the valves of pectens have attached to their external 
surface some remains of annelid tubes referable to Spirorbis. The 
tubes are not sufficiently well-preserved for description. The 
superior face is convex and subconical, excavate centrally and the 
surface of the tube transversely wrinkled, whilst a median ridge 
runs along the upper surface bordered by two lateral ridges. The 
tube varies somewhat in diameter, averaging about 1 ‘25 mm. 
The genus is mentioned by Tate* as occurring in our older Ter- 
tiary beds. The above specimens occur in the polyzoal rock. 
POLYZOA- Cyclostomata. 
Heteropora pisiformis, MacGillivray. 
(Plate VI., Figs. 5, 6.) 
H. pisiformis, MacGillivray, 1895, Trans. B. Soc., Viet., p. 144, 
pi. xxi., fig. 15. 
The definition of this species, which Dr. T. S. Hall furnished for 
the late Dr. MacGillivray’s report, runs as follows “ Zooecium 
nearly spherical, apparently free. Surface closely covered by rounded 
polygonal apertures of varying size, so that it is not evident in many 
cases which are zooecia and which are cancelli, as all gradations 
in size are present. Bounding walls of aperture stout. 4 he aper- 
tures of all sizes usually closed by a concave porous plate placed 
slightly within the mouth.” 
Three examples were found in crashings from the polyzoal 
limestone of the Seal River. One was perfectly spherical, and 
subsequently fell to pieces owing to incipient fracture. The zoarium 
here figured* is spherically topped, but appears to be adherent to a 
foreign particle at the base, so that it has assumed the shape of a 
fig °The third specimen was partly damaged, but still shows a 
clavate outline, and of this a section was made, which exhibits the 
curvi- radiate arrangement of the zooecia. . 
This species has hitherto been recorded only from Spring Creek, 
Torquay (Janjukian). 
* Proc. Roy. Soc., N.S.W., vol. xxii., pt- 2, 1888, p. 2->l. 
