138 PALEOZOIC PALEONTOLOGY. 
much smaller, rarely attaining a diameter of more than 1.25 mm., 
while in C. halli they are usually about 3 mm. in the adult condition. 
The corallum of C. halli also grows to a much larger size than does 
Nyctopora. The presence of mural pores can only be detected in 
thin sections of the coral. 
ROMINGERIA ? TRENTONENSIS 0. sp. 
Plate Vile hica 5: 
Corallum consisting of loosely-spreading and sometimes anasto- 
mosing, irregularly subeylindrical, straight or curved branches, 5 to 
10 mm. in diameter, each branch being formed by the aggregation 
of from six to ten of the subcylindrical corallites, which are in lateral 
contact throughout the greater portion of their length. The indi- 
vidual corallites subcylindrical in form, usually nearly straight, the 
sides diverging gradually from the initial point, attaining a length 
of from 5 to 10 mm. and a breadth of from 2 to 2.5 mm. The axes 
of the corallites diverge slightly from the axis of the branch of 
which they form a part, their sides in lateral contact, except distally, 
where at least the outer side and sometimes the whole corallite is 
free, and is frequently curved outward. The septa represented by 
vertical strie, of which about twenty-five can be recognized at the 
aperture of the larger corallites. Tabula present, but not abundantly. 
Remarks.—In some cases the surface of rather large slabs of lime- 
stone are entirely covered with fragments of the branching colonies 
of this coral. 'The colonies were apparently free throughout the 
greater part of their extent, being only attached basally. They have 
the general appearance of a large Aulopora, but apparently do not, 
as in that genus, grow parasitically upon other objects. The coral is 
entirely different from any of the heretofore-recognized species from 
the Trenton, and is referred provisionally to the genus Romingeria. 
This genus has not previously been recognized in strata older than 
the Niagaran, and the best-known species, R. umbellifera (Bill.), is 
from the Devonian. . R.? trentonensis differs from R. umbellifera in 
the form of the septa, they being represented by vertical strie, and 
not by rows of spinules, and in the absence of the verticillate manner 
of branching, which characterizes the Devonian species. 
PS 
