57 
tabulao are very large, sliglitly waving, and rather close to one another (PL 
II, Pig. 21)) ; the septal fossula is indistinct and very small. 
Dhnensiom. — Length, five to six centimetres ; diameter, two centi- 
metres. 
Relations and Differences. — This species has some resemhlance to 
Amplexus Yandelli, Milne Edwards and J. Haime ; it differs from it mainly 
in the shorter and less twisted shape, in the slight development of its septa, 
as well as in the shallowness of the septal fossula. 
Horizon and Locality. — This Amplexus, which I dedicate to the 
learned geologist who, even as the Lev. W. B. Clarke, has explored important 
regions of Australia, was found in an argillaceous limestone in the Tass 
District, and in a blue-grey limestone at Quedong. 
Genus — CCENITES, Eiclmald. 
CcENiTES EXPANSIJS, L. G. dc Konmcli. 
PI. II, fig. 3. 
Corallum, with a rather broad base, spreading in large laminae of 
a uniform thickness of about two millimetres ; these laminae are folded in 
various ways, and joining at the points of contact, produce cavities of very 
variable size and shape. The caiices are small, close and little prominent ; in 
shape they are siibsemilunar ; the convex side is fairly regular, whilst the 
opposite, that directed towards the base, is furnished with two small teeth 
separated by a medium hollow ; the diameter is not more than a quarter 
millimetre. The two sides of the laminm which compose the corallum are 
quite similar, and a fracture shows that the corallites trend obliquely from 
each side, above downwards, and meet one another at a fairly acute angle at 
about the middle of the laminm. 
Relations and Differences. — This species is easily distinguished from 
all those known at present by its great size and the regular thickness of the 
laminse, as well by the small dimensions of its caiices, which in shape alone 
resemble those of Coenites juyiiperinus, Eichwald. 
Horizon and Locality. — A single specimen of this beautiful species 
has been found in a deep black limestone on the banks of the Murrumbidgee, 
in the Yass District. 
