J Tec 
ie 
Mh 
fe 
os 
2 Br 
| ORES POC RCT ae, OREM aa ee SER erage SUL ee Le 
SH eens Oot = us cei aS he er cy Stem Ae 
Paleozoic Corals and Foramintfera. 121 
Jel Stylaxis Flemingii (M‘Coy). 
Sp. Char. Corallum of very long, prismatic, generally hexagonal, 
easily separable tubes, averaging 3 lines in diameter ; outer 
surface strongly striated longitudinally, and marked with di- 
rect transverse rugosities of growth ; bipartite division of the 
columns frequent : vertical section exhibiting the thin flat axis 
surrounded by an inner zone of small vesicular plates inclining 
downwards and outwards from the axis, and an outer zone of 
small vesicular plates inclined in an opposite direction or up- 
wards and outwards: horizontal section, axis thin, half a line 
wide, surrounded by about forty-three thin, radiating lamellee 
from the walls, half of which only reach half way ; numerous 
small, thin, transverse connecting plates between the lamellie 
in the outer zone. 
The bipartite mode of division of the column is frequently 
and easily observed in this species, which commonly forms large 
masses. It greatly resembles externally the Stylastrea basalti- 
formis, but is easily distinguished by the small, but distinct, cen- 
tral axis visible in the transverse fracture, and further by the dif- 
- ferent disposition of the lamellz of the inner zone. The small 
size of the tubes and less number of lamellz distinguish it from 
the Stylaxis major. 
This is probably the Lithostrotion striatum of Fleming, (Brit. 
Anim.) as he particularly says, “the rays of the star unite with 
a small solid central axis.” I think-however with Mr. Lonsdale, 
that he is wrong in his references. I have great pleasure in de- 
dicating it to so admirable a naturalist, the extraordinary merit 
of whose writings on the British marine animals is well known 
to all who engage in the same laborious and difficult study. 
Common in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge.) 
Columnaria (Gold. as here redefined). 
Gen. Char. Corallum of aggregate, subparallel branches, either 
round and concentrically wrinkled, or more usually by mutual 
pressure becoming polygonal and longitudinally suleated, but 
always easily separable; internal structure as in Amplezus, 
having many transverse simple diaphragms, and the walls lon- 
gitudinally sulcated by marginal rudimentary lamelle, which 
crenulate the edges of the transverse plates. Increase by fis- 
sure of the parent tube or cell, as in Stylastrea (Lonsd.). Type 
of the genus Columnaria sulcata (Gold.). 
This genus has been erroneously described by Goldfuss in the 
first instance, and has been misunderstood by nearly every sub- 
sequent author—all describing radiating lamelle from the walls 
