Prof. W. King on Spirifer cuspidatus. 7 
impressions as they appear when magnified twenty diameters ; 
and fig. 5 shows the perforations similarly enlarged, precisely 
in the order, and at the distance from one another, to make 
the impressions answer to the centres of the perforations. 
It is also of some importance that the appearances which I 
took for at ne are stated in my paper to occur “ here 
and there” in “ patches ””—a statement completely corroborated 
by Dr. ee himself, and singularly agreeing with his 
remark, applicable to all the perforated specimens he has exa- 
mined, ‘that the perforations have a “ patchy distribution.” 
No. 2.—This specimen has been kindly lent to me by Mr. 
Morton, F.G.S8. &e., of Liverpool. Its locality is not known: 
possibly it is from the west of Ireland. 
Four sections, all showing perforations, most of them agree- 
ing with those of No. 1, except that they are in general larger, 
which appears to have been caused by metamorphism. In one 
section they are quite distinct, but in the others they are more 
or less obscure. ‘The perforations in the best section have a 
dark granular infilling; and generally they have an indefinite 
outline; the darkest are the best defined. In two of the sec- 
tions the contents of the perforations are for the most part pale 
and subtranslucent; and the perforations themselves are each 
surrounded by a broadish encircling zone of what appear to be 
granules or cellules, though the appearance seems to be due to 
the ends of the fibres risimg up around the perforations. In 
one section the perforations have lost all characters as such, 
each being unusually large (larger than those above referred 
to), and appearing as if it were a mere aggregation of trans- 
parent cellules or granules (fig. 6). In most of the sections 
the fibres are subtranslucent and well displayed: they run 
straight on or wind about, but sweep past the perforations 
with : scarcely any deviation. The sections were easily rubbed 
down. 
No. 3.—Specimen presented by Dr. M‘Coy. It is the one 
represented under fig. 1. 
Of six sections, one shows no distinct perforations ; perhaps 
one or two slightly opaque spots might be taken for them: 
two others show something of the kind somewhat more ob- 
scurely, but more numerously: in the fourth they are some- 
what less obscure, and, besides varying much in size, they are 
“seattermg.” The other sections are even less satisfactory. 
The fibres are quite distinct. 
~ No. 4.—I succeeded in getting no more than three sections 
from this specimen: only one of them shows what may be 
perforations, of a light-brown colour, but no better than the 
less “‘ obscure ones”’ in a section belonging to the last speci- 
