§ 
Fossil Corals of the family Cyathoph yt 183 
larly stellate; numerous intermediate dissepiments uniting the 
lamelle, snd the outer portions of the corallum of a polyp, con- 
sequently, regularly cellular. 
The type of this genus is the Cyathophyllum dianthus.* ‘The tex- 
ture of the interior at middle is transversely septate, while either side 
of this medial portion the texture is cellular. In some species the cel- 
lular portion is very narrow, and these form a transition to the genus 
Calophyllum ; this texture may in all instances be perceived on polish- 
ing down the exterior, when the surface will appear cellular as de- 
scribed ; and the cellules are mostly nearly rectangular. The trans- 
verse septa are occasionally much convex. 
In the dianthus the intermediate dissepiments run obliquely from 
above downward and inward ; and the same is true of many other 
species. There are others in which these dissepiments run upward 
and inward, and as the species have also some difference of habit, 
they constitute at least a Subgenus, if not a wholly distinct group. The 
name Heliophyllum has been applied by Mr. James Hall. to a speei- 
men of this kind in his cabinet, and may well be retained. It is rep- 
resented in his New York Geological Report, fig. 3, p. 209, and is 
ee near the Cyathophyllum_ helianthoides of Goldfuss, pl. 20, 
ae subgenus Heliophyllum will then contain species having gene- 
rally the transverse septa of the Cyathophylla, but with the intermedi- 
ate dissepiments running oblique upward and inward. 
Both solid, ramose and simple species, are included among the Cya- 
thophylla ; aad we do not deem it necessary to separate the cylindrical 
and prismatic species, which have a similar internal texture, although 
heretofore referred in part to the genera Lithodendron, Colunmaria, 
and Caryophyllia. Should they be separated, a new genus should be 
constituted, as they are not true Caryophyllie, nor Columnarie ; nei- 
ther do they belong to the Lithodendrum of Schweigger. 
Genus 2. Catopuyitium, Dana. Quite simple, caliculato-ra- 
mose or aggregate. Corallum within transversely septate ; cells 
concave, lige stellate ; no internal dissepiments between the 
1 the sides of the corallum, therefore, not cellular. 
ere Calophylla pass gradually into the Cyathophylla, but still may 
be readily distinguished by polishing down the exterior to a depth of a 
line, when the edges of the vertical lamelle within are brought into 
view, and the abestive of intermediate dissepiments is apparent. The 
Jamelle of the cell sometimes appear split open or subdivided towards 
* See Murchison’s Silurian System, pl. 16, figs. 12, 126; also figs. 9, 10, 1a. 
