MIDDLE BALA GROUP. 
47 

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

5 
G1 
G1 
Gl 
G1 
Gl 
Gl 
case 
G 



Worm-trails. 
p. 129. 
p. 129. 
p. 130. 
Pl. 1D, fig. 13. 
Worm-tubes, 
horny and shelly. 
T. annulatus, p. 63. 

Pl. 1D, fig. 10, p. 133. 
See Upper Ludlow rock. 


Palezaster asperrimus, Salter (Mem. Geol. Surv. 
mr. pl. 23, fig. 2), with long blunt arms, 
and a very rough upper surface. 
Paleaster? same species crushed (Ast. primeva 
of Salter (not of Forbes) Decade 1. Mem. Geol. 
Surv.), see list in Quart. Journ. Geol. Soc. 
Vol. 1. p. 20, as before. 
Paleaster squamatus (Salter MSS.), upper side 
only. 
Protaster Petri (Salter MSS.), a new form, 
very like P. Sedgwickii, Forbes. 
Annelida—Traces, &c. 
Nereites Sedgwickii. This is the impression 
of the worm itself, and shews the broad 
lateral processes (elytra). The feet of marine 
worms are simple processes, with bunches 
of setw or bristles, and sometimes fleshy 
cirrht. 
Nereites cambrensis, McLeay var. a. (Silur. 
Syst. pl. 27, fig. 1). 
Myrianites tenuis, McCoy. Here we have only 
the numerous coiling trails made by a nar- 
row worm-like body in the fine mud. 
Tentaculites anglicus, Salter (Siluria, 2nd ed. 
pl. 1, fig. 3). Straight unattached worm 
tubes, resembling some horny Mediterranean 
species: and none still like the Cornulites 
serpularius of the Wenlock and Dudley 
rocks, 
Trachyderma? levis, McCoy. (I strongly sus- 
pect this to be a fragment of Serpulites 
longissimus ; and to have come from Upper 
Ludlow rock.) 



a, 222* Casi. The origi- 
nal from near Welsh Pool, 
in Mus. Pract. Geology. 
a, 222, Moel-y-garnend. W. 
side of Bala Lake. 
a. 110, Bala. (Rev. J. 
Peters.) 
a. 108, Bala. (Rev. J. 
Peters.) 
a. 223, Thornielee Quarry, 
Tweed. Aberystwith. (Dr. 
Milligan.) 
Thornielee Quarry, Tweed. 
a. 224, Grieston-on-Tweed, 
Inverleithen. 
[N.B. I strongly suspect 
that the worms Nereites 
McLeayti, N. Sedquickii, 
and Nemertites, from Llam- 
peter are of this geological 
age—Middle Bala. ] 
a. 128, Horderley. The 
Hollies, Shropshire. Llan- 
santfraid, Glyn Ceiriog, 
N. Wales. Ravenstonedale, 
Westmorland. 
(Said to be from) Acton 
Scott, Shropshire. 
