ii APPENDIX A. 
Association Reports for 1845, I have endeavoured to shew 
that they are Serpulina. And Prof. Forbes has since kindly 
pointed out to me, that a corneous Annelide, of similar form 
but thin texture, occurring in very deep water in the Egean, 
seems to confirm my opinion. 
When the exterior coat of a Cornulites is stripped, the cel- 
lular structure at the varices appears about half-way down each 
cup; the tube is narrower at the mouth than at the back of 
each joint—in all probability this is due to the inversely conical 
shape of the head, and this character is more strongly marked 
in the full grown animal. 
The internal cast of Tentaculites also is different from the 
external form, just as in Cornulites ;—the thick varices of each 
ring presenting on the cast a step-like form; this is well 
shewn in the common Silurian species 7. annulatus, Schlo- 
theim, which when the shelly tube has disappeared in the ma- 
trix, always appears as the 7’. scalaris of Schlotheim, but when 
the exterior is preserved, or what is more frequent, when the 
impression of the outer surface remains, the surface is regularly 
covered by longitudinal strie exactly resembling those of 
Cornulites ; I believe this has not before been observed. 
Cyruere? umponata, Sp. Nov. Ref. Pl. 1.E. fig. 6, (as Cera- 
tiocaris ?) natural size and magnified. 
Sp. Ch.—Smooth, broad-oval, oblique, margined round the 
anterior end, or that side where the general convexity rises to 
an umbo. Length nearly a quarter of an inch. 
A common species, varying from nearly round to oval : the 
convexity sometimes diagonal. 
Loc—N. Wales, in Cambrian rocks. 
Beyricura, M ‘Coy. 
A genus easily recognized, now that its characters have 
been described by Prof. MeCoy. Formerly it was associated 
with Agnostus, a true trilobite, from which the separated valves 
are at once distinguished, by their unequal division into lobes. 
The genus now contains four or five species. 
The valves are oblong and convex, their dorsal margin 
slightly concave or straight, the ends nearly equal: the surface 
deeply grooved, dividing them into two or more ridges—a 
raised rim, separated by a deep concentric furrow, runs round 
the ends and ventral margin (in our three British species). 
Pl. 1. E. fig. 3. 
Syvn.—Agnostus pisiformis, Salter, in Quart. Geol. Journ. Vol. I. 
p. 20 a, &e. B. complic. id.in Memoirs Geol. Survey, Vol. IT. 
Pt. 1. Pi. 8. fig. 16. 
Sp. Ch.—Smooth, compressed, oblong, the ends rounded ; 
three transverse tubercles, or ridges, united towards the ventral 
edge, and separated by a deep concentric furrow from a thick 
rim which runs round the ends and front ; the caudal tubercle 
deeply bifurcate. 
Internal casts frequently lose the thick marginal rim. 
BEyYRICHIA COMPLICATA. 
The 
caudal tubercle varies in shape, and sometimes, instead of being 
bifurcate, is divided into two, which lie nearly parallel. The 
species can hardly be mistaken, and is very plentiful in the 
Cambrian rocks. 
Loc.—N. Wales. 
Beyrica1a stranecunata, Sp. Nov. Pl. 1. E. fig. 1. 
Syvn.—Cytherina levigata, Salter, in Quart. Geol. Journal, Vol. I. 
445. 
Sp. Ch.—Granulose, ovate-reniform ; a raised marginal rim, 
separated by a deep furrow, round the anterior half of the 
ventral edge ; a transverse deep sulcus runs obliquely from the 
dorsal edge nearer the smaller (anterior) end. 
Our figure represents the ventral rim as probably produced 
round both ends; we do not feel sure of it—and the specimens 
seem rather to indicate that it is confined to the anterior half 
or two-thirds. The fossil has much the aspect of a Cypridina, 
when the rim is lost, as it frequently is—but the short furrow, 
bounded anteriorly by a swelling, runs from the dorsal, not the 
ventral edge. 
Loe.—Coniston, Lancashire, Cambrian. 
Puacors, Emmerich. 
Including under this genus all the forms (or subgenera) 
which have been described as Cryph@us, Odontochile, Phacops, 
and Portlockia, we have an extensive and natural genus, begin- 
ning in nearly the lowest part of the Cambrian rocks, and 
extending upwards to the Devonian—probably even to the 
best of the Carboniferous system. 
P. (Opont.) oprustcaupatus, Sp. Nov. Ref. Pl.1. G. figs. 15, 16. 
Syn.— Asaph. caudatus, Salter, Quart. Geol. Journ. Vol. I. p. 446. 
P. oprusicaupatus, id. Mem. Geol. Surv. Decade II. Pl. 1. 
p. 7, note. 
Sp. Ch.—Head broad and short ; glabella with very distinct 
furrows, the uppermost lobe not much larger than the rest ; 
cheeks wide, with a short and narrow posterior spine; tail 
short, broad, subtriangular, obtusely angulate at the end; axis 
broad, convex, 11-12 ringed, obtuse; lateral ribs, about nine, 
nearly straight, distinctly interlined, abruptly terminated against 
the narrow equal margin. 
It is the tail which differs so much from the other British 
species of the genus as to render it necessary to give a new 
name ; the head, though wider and with much smaller head- 
spines than P. caudatus*,is yet very like it in general contour ; 
it also resembles Ph. rotundifrons, Burm. The neck-furrow 
on the cheek, which in P. caudatus is broad and turns upward, 
is in this narrow, and runs close along the straighter posterior 
margin. We have not the eyes preserved. 
Loc.—Coldwell, Westmoreland, Upper Cambrian. 
P. (Puac.) auirrons, Sp. Nov. Ref. Pl. 1. G. fig. 12 (and tail, 
18,14). 
Sp. Ch—Cephalic shield very convex, tuberculate, semi- 
circular, truncate and with two projecting angles in front ; 
glabella subtriangular, wide above, the forehead lobe wide 
* Phacops caudatus has been referred to as occurring in two or three localities in the Lower Silurian rocks of NV. Wales. (Quart. Geol. 
Journ. Vol. 1. p. 20, 21). There is no good evidence of this. It occurs there plentifully in the upper Silurian ; and in S. Wales has been 
found in Lower Silurian. 
