EXPLANATION OF THE PLATES. 29 
Fic. 5.—EcutnospH£ritrs Barticus, Hichwald. 
Spheronites Balticus, Eich. Forbes, in. Mem. Geol. Surv., vol. ii., part ii., p. 
518, pl. xxii., fig. 3, and vol. iil., p. 287, pl. xx., fig. 10, the same figure 
having been transferred. 
From the original figure, drawn by the author, in the work above cited; “a 
round or oblong body, covered with polygonal plates, the surface being 
ornamented with a network of triangles, forming a number of star-like 
devices, which completely conceal the true disposition of the plates.” 
Forbes, in Mem. Geol. Surv., before cited, vol. ii., pl. i1., p. 518. 
Carapoc or Bata Rocxs.—Bala, North Wales ; Sholes Hook, South Wales. 
Fic. 6.—HEMICOSMITES ? OBLONGUS, Pander, sp. 
Echinospherites oblongus, Pander, Beitrage, pl. ii., figs. 22,232. H. oblon- 
gus, Forbes in Mem. Geol. Surv., vol ii., part i1., p. 511, pl. xx., fig. 6; and 
vol. iii., p. 288, pl. xx., fig. 11, the same figure having been transferred. 
From the original figure, drawn by the author in the work above cited, pl. 
eK 10210: 
This fossil is composed of large plates, ornamented with fasciculi of ra- 
diating grooves. 
Carapoc SLATES.—Sholes Hook, Haverfordwest. 
CRINOIDEA. 
Fig. 7.—a, b. GLYPTOCRINUS ? BASALIS, MZ‘ Coy. 
Brit. Pal. Foss., p. 57, pl. i. D, fig.4; Siluria, third edition, p. 206; Foss. 29. 
Celocrinus, proposed n. g. Salter, in Mem. Geol. Surv., vol. iii., p. 283, pl. 
Xxlil., fig. 4. 
From the original figures in the Mem. Geol. Surv. just cited, pl. xxiii., figs. 4 
and 4 ¢ (there are two figures on the plate marked with this letter). 
[The references to this figure, as in several other instances, are somewhat 
confused, and there is a great want of more complete explanations to 
the plates in this volume, some of the figures not being alluded to at all, 
and no information given as to enlarged representations. ‘There is a list 
professing to give the contents of the plates at p. 379; but it is a very 
meagre one, and does not explain the whole of the figures, or mention even 
all the species. ] : 
a. From Mem. Geol. Surv., pl. xxiii., fig. 4. This fossil shows the rounded 
stem, consisting of numerous rings or joints, connected with what is called 
the head or body, which was composed of numerous hexagonal plates, 
some of the lower ones being marked by small tubercles, and radiating 
ridges; from the upper portion of this body proceed the “ arms and fin- 
gers,” or tentacles, of a graceful and feather-like character, much longer 
than shown in our figure, to which we have added a small portion from 
another specimen in the Mem. Geol. Surv. of Ireland. 
- 6. From Mem. Geol. Surv., pl. xxiii., fig. 4e. A single plate, showing the 
radiating ridges, and scattered tubercles ornamenting the surface. 
“ Carapoc Rocks.—Everywhere in Wales ; Guilsfield, near Meifod ; Mont- 
gomeryshire, near Llanwddyn, in Berwyn mountains ; Bala, Merioneth- 
shire ; Bettws-y-Coed, Caernarvonshire.” Mr. Salter, in Mem. Geol. Sury. 
vol. ili., p. 284. 
