R. Scott. — On Traquairia. 
465 
described as distinct species. They occur in association with Lepidodendron 
Veltheimianum. The first very much resembles T. Carruthersii. I propose 
to call this 
Traquairia burntislandica (PI. XXXIX, Figs. 1, 2, 3; PI. XL, 
Figs, it, 12, 13). 
The form is spherical. 
The spines appear to have been brittle, as in T. Carruthersii. They 
do not branch or taper. At their apparent base they give off anastomosing 
tubes, which connect one spine with another and form a coarse network 
over the sphere. The spines are arranged in groups of 4-6. The total 
number of groups was probably from 24-30. 
Each spine has numerous projecting tubular pores in about six longi- 
tudinal rows. From these pores emanate threads much as in T. Carruthersii. 
The spines are enveloped in a gelatinous mass. The specimens 
observed are not well preserved, and the internal structure cannot be 
made out. 
Measurements : — 
Diameter of the sphere without spines : 0-36-0*42 mm. 
Length of spines : 
Width of spines : 
about 0-24 mm. 
I 2 [X- 1 8 fJL. 
In some tangential sections one sees five groups each composed of 4-6 
spines cut across, and outside these seven or eight groups are seen. 
Traquairia burntisla 7 idica is much the same size as T. Carruthersii , 
and differs principally in having its spines arranged in definite groups. 
The second species I propose to call Traquairia stellata , as it has an 
appearance like that of a star. 
Traquairia stellata (PI. XXXIX, Fig. 4). 
The form is spherical. 
The arms or spines are much fewer and broader at the base than in 
T. Carruthersii or in T. burntisla?idica. The general appearance of a 
radial section is something like a starfish in form. The number of arms is 
about twenty-four, uniformly distributed round the sphere. The arms are 
pointed, widening out at the base, so that the base of one almost joins the 
base of the next. They appear to be chambered, the chambers sometimes 
forming a single series, while in other cases they are further divided by 
longitudinal septa. They are deeply embedded in the gelatinous mass. 
One cannot feel at all sure that these chambers may not be due to dis- 
organization. Tubes are given out from the base of the arms, but the 
structure is so imperfectly preserved that little can be said on this point. 
