56 
Dimensions. — According to Milne Edwards and eT. Haime the diameter 
of large examples of this species may attain the size of eight centimetres ; 
that of the Australian specimens submitted to me is not more than half the 
width. 
Horizon and Localities . — It occurs in Australia, at Tarralumla and 
Cope’s Gully ; in England in the Devonian of Torquay and Plymouth, 
4. Ctathophyllijm helianthoides, Goldf. 
Cyathoplryllmn heliantho'ides, Goldfuss, 1826, Petref. G-erm., I, p. G-i, pi. 20, fig, 2. 
Favastrea heliantholdea, De Blainville, 1830, Diet. Sc. Nat., LX, p. 341. 
Asirea helia^ltJwides, Lonsdale, 1841, Trans. Geol. Soc. Loudon, V (2), p. 697. 
DiscopJiyllum heliantho'ides, A. d’Orbigny, 1850, Prodr. Pal., I, p. 106. 
Cy athophyllum ,, Milne Edwards and J. Haime, 1858, Polyp. Poss. Terr. Pal., 
p. 375, pi. 8, fig. 5. 
,, „ Idem, idem, 1852, Brit. Boss. Cor., p. 227, pi. 51, fig. 1. 
This coral, of which the calice may attain a very great diameter, is 
simple or compound. In the former of these conditions it is usually very 
short and subturbinate ; the edges of the calice are often reverted so as to 
form a fairly prominent ridge around the central portion which is excavated 
[to form] a fossula ; there are, however, varieties in which this ridge is not 
present and in which the calice is more regularly expanded. It is with this 
last mentioned variety that the only Australian specimen I have seen agrees. 
Its septa are thin, apart, seventy in number, reaching right to the centre and 
of the same thickness throughout their length. It is two centimetres long 
and eight centimetres in diameter. 
Horizon and Localities. — This is one of the most characteristic species 
of the Devonian limestone of the Eifel. In Australia it is found in the Yass 
District. 
Genus — AMPLEXUS, Soicerhy. 
Amplexus Selwyni, L. G. de Koninch. 
PL II, fig. 2. 
Corallum of medium size, basal extremity regularly conical or slightly 
curved. Epitheca very thin ; the septal ridges are very plain, very regular, 
separated from one another by furrows of the same width as themselves, and 
crossed by several faint growth ridges. In adult specimens the septa are 
sixty in number ; they are very small and do not extend more than a milli- 
metre into the interior of the calice, which is about a centimetre deep. The 
