EXPLANATION OF THE PLATES. 67 
PLATE XXIII. 
FOSSILS OF THE WENLOCK ROCKS. 
CRUSTACEA.—TRILOBITA. 
Fic. 1.—a, b. CALYMENE BLUMENBACHII, Brongniart. 
Crust. Foss., pl. i., fig. 1. Sil., 4th edition, p. 516, pl. xvil., fig. 1. 
a. Original. Wenlock Limestone, Castle Hill, Dudley. Mus. G. S. 1. 
b. Coiled example. From Sil. Syst., pl. vii., fig. 7, Wenlock Limestone, 
Dudley. 
Carapoc To Luprow.—Sil. 4th edition, p. 516. ‘This common species 
was perhaps the most prolific of all the Silurian Trilobites. No other 
form had a greater vertical range, or is more widely diffused in geo- 
graphical space than the long-known Dudley fossil. It has been found 
i abundance in the lower strata of the Caradoc formation near Snow- 
don; and from beds of Caradoc sandstone in Shropshire ; a variety of 
this species also occurs in the Lower Silurian (Caradoc) rocks of Tyrone ;” 
ibid., pp. 203, 4, 235. Additional localities: Caradoc, Bala; Berwyns. 
Llandovery. Drummuck, Ayrshire. 
Upper Silurian. Wenlock, Ledbury, Ludlow, Tortworth, Cat. Brit. Foss., 
p- 102. Dingle, Co. Kerry. Mus. G.S. I. 
Fic. 2.—ENcCRINURUS PUNCTATUS, Grinnich, sp. 
2Calymene punctata, Sil. Syst., p. 661, pl. xxxiii., fig. 8. 
E. punctatus, Mem. Geol. Surv., Dec. 7, p. 6. Description of pl. iv. 
Original. Wenlock Shale, Malverns. Mus. G. S. I. 
LLANDoVERY To LupLow.—Sil., 4th edition, p. 517. 
The tail of this species is figured (ante, p. 50, pl. xvi., fig. 12) as also 
characteristic of Llandovery rocks, especially in the Co. Galway, in 
rocks of the same age at Hope quarry, Shelve, Sil., 4th edition, descrip- 
tion of pl. 10, figs. 4, 5. Additional localities: Lower Silurian; (2 Lan- 
dovery rocks,) Pwllheli, Caernarvonshire ; Mathyrafal, Montgomeryshire, 
N. Wales ; S. Wales ; Coniston, Westmoreland, Upper Silurian, Dudley, 
a 0 Cat. Brit. Foss., p. 107. Ferriter’s Cove, Co. Kerry. Mus. 
Fig. 3.—ENCRINURUS VARIOLARIS, Brongniart, sp. 
Calymene, Brong. Crust. Foss., pl. i., fig. 3 B. Sil. Syst., p. 655, pl. xiv., 
fig. 1; Enerinurus, Mem. Geol. Surv., Dec. 7, pl. iv., fig. 12, 13, p. 7. 
Sil., 4th edition, p. 517, pl. xviii., fig. 9. 
Original. Wenlock Limestone, Dudley. Mus. G.S. I. 
