98 
Kirtley F. Mather 
AULOPORID^ 
Genus AULOPORA Goldfuss 
Aulopora sp. 
Plate /, figure 6. 
A single specimen of a small trumpet-shaped coral attached 
throughout its entire length to a fragment of a Cystodictya and 
reproducing by basal gemmation, is believed to represent othe 
genus Aulopora. Its specific relations are not apparent and it 
is probably an undescribed form. About three corallites occupy 
the space of 5 mm. longitudinally; the average diameter of the 
calyx is 0.4 mm. 
Horizon and locality. Morrow formation: near Ft. Gibson, 
Oklahoma (Station 301). 
Genus CLADOCHONUS M^Coy 
Cladochonus fragilis n. sp. 
Plate I, figures 3-5. 
Description. Corallum branching ; the delicate, funnel-shaped 
or cylindrical corallites increasing by lateral gemmation, at- 
tached only at the base or occasionally throughout the colony. 
Corallites without tabulae or septa, the latter represented by 
faint rounded striae on the interior wall of the corallite. Epi- 
theca faintly wrinkled or smooth; upper portion of the wall of 
the calyx thin, but thickening interiorly downward; calyx cir- 
cular. Individual corallites generally expand symmetrically up- 
ward from the base, until the point of gemmation is reached; 
there a single bud is given off and immediately beyond the base 
of the new individual the older one curves sharply away and 
flares out rapidly toward the margin of the calyx, giving an 
approximation to a trumpet shape to the more sharply curved 
individuals. The point of gemmation is located on the average 
about four-fifths the distance from base to calyx opening. Aver- 
age diameter of calyx: 1.5 mm.; average length of individual: 
3 mm. 
Remarks. The material at hand consists of fragments of a 
broken colony, or colonies, none of which show any attachment 
to foreign objects. The species resembles neither of the two 
described American species of Cladochonus, being much smaller 
