50 
UPPER CAMBRIAN. 

Names and References; Observations, &c. 








Numbers and Localities. 

and keeled below, with the pores in quin- 
All the other species differ from this 
in the arrangement of the fringe. 
Trinucleus seticornis, Hisinger (Leth. Suec. 
Supp. p. 3, t. 37, figs. 2, 3). See also Decade 
vu. pl. 7, p. 7, where the surface is de- 
scribed as reticular, and the fringe bent 
down from the glabella suddenly. 
Lichas laciniatus, Dalman. A Swedish species. 
Lichas laxatus, McCoy (Synops. Sil. foss. 
Trel. pl. 4, fig. 9. Salter, Mem. Geol. Sury. 
Vol. m1. pl. 19, figs. 1—8). 
Lichas (Trochurus) nodulosus, Salter. A very 
knotty tailpiece, the interstices between the 
ribs being puffed out into knobs. 
Acidaspis Brightii, Murch.? (Siluria, 2nd ed. 
pl. 18, figs. 7, 8). It is not certain that 
this is the species figured originally from 
Dudley, and common there. 
cae pad Reference to McCoy’s 
ae Synopsis: and Figures of Genera. 
cunx. 
G Tretaspis, p. 147. 
L. propinqua, p. 150. 
Gk LL. subproquinqua, 
Pl alaeeh oly. 
Gk p. 337 
tf 
ATKIN 
OT; I oa 
Gk 
Gk 
Gk 


Ceraur. Clavifrons, 
PI Eee 12, 
» 
t PT ee 




Staurocephalus Murchisoni, Barr. (Mem. Geol. 
Surv. Dec. x1. pl. 5, figs. 1—4). One of the 
genera related to Chetrurus, and with a 
globular glabella (stomach) placed far im 
front—with stalked eyes, a body of 11 rings, 
and a comb-shaped tail piece. 
Wenlock limestone. 
Occurs in 
Spherexochus boops, Salter, Mon. Brit. Trilob. 
p- 79, pl. 6, figs. 27, 28. 


a. 134*, Bwlch-y-groes ; 
Llanwddyn, Conway River; 
Glyn Ceiriog. As 7. latus, 
Bala; Maes Meillion; Ys- 
pytty Evan; Selattyn; Pen 
Cerrig Serth. As TZ. fim- 
briatus, Bryn Melyn; Cefn 
hir fynydd. 
Dufton, Westmorland ; 
Cefn Grugos ; Rhiwargor ; 
Rhiwlas. 
a. 138, Coniston. 
Llanwddyn; Cefn Goch; 
Glyn Ceiriog; Rhiwlas. 
b. 231, Pont-y-Glyn, Diff 
wys, W. of Corwen. 
a. 112, Blaen-y-ewm, Nant- 
yr, S.E. of Corwen. (Beds 
apparently below the Bala 
limestone, but possibly a- 
bove it, J. W.8.) 
b. 230, Rhiwlas, Bala. 
a. 114, Applethwaite Com- 
mon; Coniston. 
