OF NEW SOUTH WALES. 93 



Vasillum tuberculatum, n. s., pi. 10, figs. 3, 3a, 3b. 



Corallum urn shaped, attached by a rather small cylindrical 

 pedicel ; apparently no epitheca •* the costae broad and flat, 

 divided by slight grooves which correspond with the primary and 

 secondary septa ; at the base of the ribs, but not at the base of 

 every one, there is a blunt, prominent and conspicuous tubercle, 

 symmetrically placed, so that there is one at each end and two at 

 each side (six in all, corresponding to the systems) of the major 

 axis ; calice broadly elliptical and rather everted ; ends of major 

 axis somewhat lower, from which the edge curves upwards to the 

 minor axis in a zigzag line ; angles of zigzag very obtuse ; the 

 apices corresponding with the primary and secondary septa, and 

 therefore with the grooves between the costse ; fossa shallow 

 except at the centre where there is a deep groove ; septa in six 

 systems of four cycles, but the third and fourth, though always 

 present are merely rudimentary ; primaries and secondaries 

 equal, salient, but not exsert, thickened at their point of union ; 

 the primaries at the end of the major axis of the calice do not 

 unite with the secondaries which meet in front of them ; all 

 highly granular. Alt. 10, major axis 9|, minor 7, mil. Port 

 Phillip or Bass Straits. The specimen was forwarded to me by 

 Prof. McCoy, from examples in the Melbourne National Museum. 



I may mention further that when the base of the fossa is ex- 

 amined by a lens and with a good light, there is a kind of 

 calcareous deposit in the centre underneath where the septa 

 unite, and at the end of the major axis, one of the secondaries 

 sends forth a process to unite with a primary. I should say that 

 the individual was not very young even though the third and 

 fourth cycles are so rudimentary. It has many analogies with a 

 fossil described by me from the Muddy Creek beds, in Proc. 

 Roy. Soc. N. S. Wales, vol. 9, (1877), p. 189, and named 

 Placotrochus elegans. I think also there is a fossil found still 

 more nearly allied, but which has not been described, nor is it 

 just now accessible to me for comparison. Its form was similar 

 though smaller, and as far as I remember it would belong to the 

 same genus. 



* The specimen is rather worn, and the details of the epitheca, costae, &c., could not be 

 well made out. 



