CARBONIFEROUS CORALS AND BRACHIOPODS 109 
thirteen long septa reaching to the columella and an equal 
number of short ones just projecting beyond the inner 
ring. A strongly marked inner ring hounding a large outer 
zone crowded with fine vesicles. The septa are usually 
very inconspicuous, so that the general appearance of the 
section is as if it were composed of a central, circular, 
blurred columella lying in the middle of a small bare circle 
and all round a deep zone of very fine vesicles. 
The specimens are not definitely located, but are, almost 
certainly, derived from the same horizon as those of 
Lithostrotion Portlocki. 
I have not assigned a new specific name to this form, as 
I am not yet completely convinced of its specific separation 
from Lithostrotion Portlocki, with which it agrees in columnar 
habit, in general size of calices and in number of septa. 
The weathered calices are remarkably similar in both, 
and, in fact, it is only in a horizontal section that the 
differences are striking. The strength of the septa and 
the sparseness of the vesicular tissue in L. Portlocki are in 
striking contrast to the inconspicuous septa, broad ring 
of fine vesicles and perfectly defined inner wall in the 
form under description. 
Lithostrotion ensifer, Ed. and H. (? = N ematophyllum 
decipiens, McCoy). 
The specimens entirely agree with the description of the 
calicinal surface given by Edwards and Haime, but as they 
make no mention jff the horizontal section, a brief account 
of the characteristic appearance which it presents seems to 
be demanded. Columella in the centre of a small, almost 
bare circle, from the circumference of which fourteen 
septa project inwards like notches (and, when well pre- 
served, are seen to extend inwards to the columella). 
Between two such circles there is a confused mass of very 
