22 
Case and 
Column of 
Drawers. 
Gi 
case 

Reference to McCoy’s 
Synopsis: and Figures of Genera. 
Trilobites. 
se 

Synopsis, 
Pl. 1F, fig. 7, p. 167. 


MIDDLE CAMBRIAN. 


Names and References; Observations, &c. 
Numbers and Localities. 

Agnostus Hirundo, Salter MSS. 
species, with lobed tail-axis. 
A large 
Agnostus Morei, Salter (Quart. Journ. Geol. 
Soc. Vol. xxi. p. 486, woodcut). 
Phacops Nicholsoni, id. ib. p. 486. 
Calymene vexata, Salter (with Asaphus Mena- 
pie). Undescribed yet. A small species. 
Calymene is very common in Arenig rocks. 
Calymene ultima, Salter (C. Ramseiw, Hicks). 
Undescribed. 
Calymene Tristani, Brongniart (Quart. Journ. 
Geol. Soc. Vol. xx. p. 286), &e. A common 
French species. 
Calymene parvifrons, Salter. One of the very 
earliest species known of this common Cam- 
brian genus. It has the smallest glabella 
known in the group. (Mem. Geol. Surv. 
Vol. mt. p. 325. Salter, Mon. Brit. Tril. 
1865, pl. 9, figs. 25—28). 
Dionide atra, Salter (Mem. Geol. Surv. Vol. 11. 
p. 321. pl. 114, fig. 9). Allied to Ampyz and 
Trinucleus, but with no perforated fringe. 
Trinucleus Gibbsii, Salter (Siluria, 2nd ed. p. 
53, Foss. 53. fig. 7). The genus is distin- 
guished by its perforated fringe round the 
glabella and cheeks. 
Ampyx Salteri, Hicks MSS. Much like A. 
nudus, Murchison. 
Homalonotus, sp. (H. bisulcatus, Mem. Geol. 
Surv. Vol. m1. p. 328. pl. 11 a, fig. 8). A 
genus more prevalent in the Upper Cam- 
brian. Like Calymene it has 13 body seg- 
ments, and a forked labrum. 
Homalonotus monstrator, Salter. Undescribed 
as yet. Homalonotus, like Calymene, ranges 
into Devonian rocks. 

a. 298, Upper Arenig rocks, 
Whitesand Bay, St. David's, 
(Dr. Hicks.) 
Ellergell, near Milburn. 
[Prof. Harkness’ cabinet.] 
Whiteside, near Braith- 
waite, Keswick. do. 
a. 469, Ramsey Isle, N. 
end. (Dr. Hicks.) 
do. do. 
Carn Goran, 8. Cornwall. 
a. 56, Tai-hirion, W. of 
Arenig. (Sedgwick and 
Salter, 1843.) 
b. 360, Ty Obry, Portma- 
doc. (Mr. Homfray.) 
a. 52, Whitesand Bay, St. 
David’s. (J. W. Salter.) 
a. 303, Upper Arenig, 
Whitesand Bay, St. Dayid’s. 
(Dr. Hicks.) 
a. 57, Ty Obry. (Mr. Ash.) 
b. 355, specimen figured in 
Mem. Geol. Sury. (Mr. 
Homfray.) 
a. 482, Ramsey Isle. N. 
end. Quite the base of 
the Group. (Dr. Hicks.) 
x 
