that of the other species, I shall now proceed to the inquiry respecting 
its inferior extremity, or organ of attachment. 
In the same spot where the fossil already described has been so fre- 
quently found, at Bradford, small protuberant masses, of a peculiar 
nature and form, have for some time been noticed on the sui’face of 
the limestone. These masses are evidently of a spathose nature, and 
their colour is remarkable, being a very dark grey, with so much ot 
a purplish hue, as to have very much the appearance of the purple fluate 
of lime. 
Having obtained, in addition to those which I already possessed, several 
very illustrative specimens from the Rev. Mr. Townsend, and having 
purchased several others from different collectors in the neighbourhood of 
Bath and Bristol, I proceeded to their examination. 
Rubbing several of these masses down in different directions, and 
giving to them the necessary polish, their real nature and their peculiarity 
of structure became manifest, Plate XVI. Fig. 5, 12, and 14. That 
they were formed of a continuation of the entrochal column of this 
species of animal was rendered obvious, by several of the specimens ; 
the same peculiar neatness in the general form of the column, as well 
as in its crenated articulations, being observable in these, as has 
been already noticed in the column, Plate XVI. Fig. 1. But if a 
doubt existed as to the identity of the species to which these several 
parts belonged, it must be removed by the examination of the column, 
Plate XVI. Fig. 5, which, with all the propeities observable in the 
pi’eceding column, possesses the particular characters of that substance 
which is found adherent to the limestone rock, and which may be 
considered as the pedicle or radicle of this species, and as answering 
to the astropodium of Lhwydd, and to the radii stellarum polyactinoholo- 
rum of Rosinus. 
In this specimen the same circumstance is observable, on which it 
was found necessary to dwell so particularly, whilst examining the 
