APPENDIX A. 
Descriptions of a few Species from Wales and Westmoreland, referred to in the foregoing Work, 
by John William Salter, F.G.S., ALS. 
Ir requires some apology on my part for introducing these few notes into the large work on whieh 
my friend Professor M°*Coy has expended so much time and labour, and in which I have been unwil- 
lingly prevented taking the share I originally intended, both with regard to figures and descriptions. 
The fruits of Professor Sedgwick’s labours in Westmoreland, together with the contributions of his 
friends from the same quarter, added to his own Collections in North Wales, were examined and their- 
localities catalogued in 1843 and 1844, and the summer-months of those years were most pleasantly spent 
with him in Wales, adding to his collections, and recording the localities, on the spot, of all the Silurian 
species we met with in that country. 
But subsequent engagements prevented me from working out the materials thus brought together, 
further than as regards the Crustacea and a few of the Mollusca; and as Professor M°Coy has fully 
described all the species, old as well as new, it is only necessary for me to give the characters on which I rely 
for the establishment of the few species to which my name is attached. 
February, 1852. 
RADIATA. 
Ref. Plate 1. D. fig. 8. 
Stems very long: below smooth and cylindrical, with a 
single row of about six tubercles round each joint,—near the 
pelvis without tubercles, but annulated, with a few rings; pro- 
minent, the intermediate ones being narrow. Pelvis small, the 
plates with six large deep pits round each ; arms ten, each 
twice branched, about twice and a half the length of the pelvis. 
The great length of the stems, which are frequently fifteen 
or sixteen inches long, and beautifully tuberculate, characterise 
this species; the stem is even and cylindrical in the lower part, 
with but few tubercles on each ring; the tubercles become 
more numerous as the stem is followed upwards; but for some 
inches below the pelvis the rings become alternately more pro- 
minent than the others, and the tubercles are quite lost. The 
AcTINocRINUS PULCHER, Sp. WVov. 
arms are close jointed, and clothed with tentacles from their 
first bifurcation. 
So perfectly are the casts made in the flagstone, that it has 
been rendered possible to figure the specimens as if in relief ; 
and the deposition of the mud has been so tranquil, that the 
arms have not been disturbed in position, each branch lying at 
an equal distance from its fellow on either side. 
Loc.—Wenlock shale of Nant-gwrhwyd-uchaf, S. of Llan- 
gollen. 
Encrinite fragments were found throughout the whole of the 
N. Welch strata by Prof. Sedgwick and myself, forming a large 
part of the Bala limestone in certain localities. In the Caradoc 
sandstone and Upper Silurians of Denbighshire they are com- 
mon where the strata are sandy, but rare where composed, as 
in the above instance, of fine shales. 
ARTICULATA. 
SERPULITEsS DISPAR, Sp. Nov. Pl. 1. D. fig. 11, 12. 
Sp. Ch.—Flat, membraneous, rapidly tapering, curved, 
finely corrugated obliquely or transversely ; the edges thick, 
rounded, 
This species shews a great disparity between the edges and 
the surface ; such a difference could not be accounted for by 
pressure, for the calcareous or rather corneous matter seems all 
collected on the thick edge, leaving the rest but thin mem- 
brane. 
S. longissimus is distinguished by the uniform shelly texture 
of its laminated tube; the lamine are so much thickened on 
the two lateral edges as to form solid bars of shell along them ; 
it is always compressed, and there is every reason to believe 
this is the natural state, not the result of pressure. It often 
attains the length of eighteen or twenty-four inches, and, con- 
trary to the usual habit of mud-burrowing Annelides, often 
assumes a subspiral form. 
Loe.—Ludlow rock, Kendal; in several places. 
Cornuuires, Schlotheim. 
I only mention this genus, because it, as well as Tentaculites, 
has been referred to various families. Dr Volborth has supposed 
Cornulites to belong to the Cystidea, as the stems of Echino- 
encrinites. It is true they much resemble them, and to heighten 
this resemblance, the conical stems of Ech. striatus are striated 
lengthwise, and have their lower edges imbricated downwards. 
But then these rings are moveable one on the other, while the 
joints of Cornulites are continuous in substance, forming a 
| single rigid tube. Both genera are evidently tubular and cel- 
lular shells,—the cellular structure at the varices being clearly 
shewn in the figures in the “Silurian System.” In the British 
b 
