46 
UPPER CAMBRIAN. 

Case and 
Column of 
Drawers. 
Reference to McCoy’s 
Synopsis: and Figures of Genera. 
Names and References; Observations, &c. 
Localities and Numbers. 

Gl 
G1 
G1 


Spheronites. 

Protocystites. 
Star-fishes. 
Asteriade. 

Paleaster. 
Quoted by mistake as an (Up- 
per) Silurian species at the 
foot of p. 60. 

Asteriade. 

Protaster Salteri, Forbes. 

Spheronites, sp. 
The group of the Cystidew is amazingly cha- 
racteristic of Cambrian rocks—+z.e. of Upper 
Cambrian or Bala strata. All the genera 
with pores scattered over the whole surface 
belong to this horizon. Those with a web- 
like ornament, viz. Echinospherites, and 
those with linked scattered double pores 
(Spheronites) are of this age (Lower Silu- 
rian of most authors). Those with few 
large rhombs to contain the pores and limit 
them belong, on the other hand, to Upper 
Silurian rocks. None rise higher, and very 
few traces indeed occur in the Middle Cam- 
brian. 
All the starfishes of the Cambrian 
and Silurian rocks belong to a peculiar di- 
vision, which differs from ordinary starfish 
by having the plates which border the 
avenues of suckers of larger size than the 
rest. In the Bala species this character is 
very conspicuous. 
(Mem. Geol. Surv. 
Vol. 11. pl. 23, fig. 3.) A species of Prot- 
aster (or Teniaster, Billings. which is a 
kindred genus) so very like the Brittle 
stars (Ophiura) of the present day that it 
was so described by Forbes in Vol. 1. Quart. 
Journ. Geol. Soc. 1845, p. 20. See Mem. 
Geol. Surv. above quoted, note to p. 290. 
See also Annals Nat. History, 2nd ser. Vol. 
20, pl. 9. 
Paleaster, Hall (Urasterella, McCoy, MSS. = 
Stenaster, Billings.) 
Paleaster obtusus, Forbes (Mem. Geol. Surv. 
ut. pl. 23, fig. 1). A species with very 
thick blunt arms, and a small mouth. 


Sholes Hook. 
a, 221, Pen-y-gair, Cerrig- 
y-Druidion. (This unique 
specimen, collected by 
Prof. Sedgwick and Mr. 
Salter in 1844, was lost for 
18 years, and then reco- 
vered.) 
The Protasters were so 
named and described by 
Forbes in Decade 1. of the 
Geol. Survey. 
Bala Lake (foot of). One 
specimen first described 
by Forbes, found by Prof. 
Sedgwick—and then others 
by the Geol. Survey. 
