38 EXPLANATION OF THE PLATES, 
PLATE XIII. 
FOSSILS OF THE CARADOC OR BALA ROCKS. 
CRUSTACEA.—OSTRACODA. 
Fig. 1.—a, 6. CYTHERE ? UMBONATA, Salter. 
Brit. Pal. Foss., Appendix A, p. ii. Ceratiocaris, M‘Coy, p. 188, pl. 1 E, 
Fig. 6. 
a. Original. Natural size; from a specimen from Bala, North Wales, in the 
Mus. Geol. Surv. Irel. 
b. Original. Enlarged from 1 a. 
Carapoc.—Siluria, fourth edition, p. 517. Localities—Bala; Corwen; Con- 
way Falls; Llanfwrog, near Ruthin. Cat. Brit. Foss., p. 105. Various 
other localities in North Wales are enumerated in the list of Caradoc fossils 
in Mem. Geol. Surv., vol. ili., p. 260. 
Fic. 2.—a, b, c. Priwitra Maccoyit, Salter, sp. 
Cythere phaseolus, M‘Coy (not of Hisinger) ; Sil. Foss. of Irel., p. 58. Cy- 
there Maccoyti; Cat. Brit. Foss., second edition, p. 105. Primitia; Ann. 
and Mag. Nat. Hist., July, 1868; S. 4, vol. ii., pl. vii., figs. 1, 2, 3. 
a. Original. Natural size. Fragment of grey limestone, showing the abun- 
dance of this minute bivalved Entomostracan ; from the Chair of Kildare. 
Mus. G. S. I. 
b. Original. Enlarged, right valve from a specimen on fig. 1 a. 
c. Original. Enlarged, dorsal view of both valves. 
Carapoc.—Very abundant at the Chair of Kildare, Co. Kildare, Ireland. 
Professor T. R. Jones, and Dr. H. B. Holl, also records its occurrence in 
rocks of similar age at Aldeans, Ayrshire; and at Keisley, in Westmore- 
land, where it was discovered by Professor Harkness, 
Fic. 3.—a, b,c. BryricHia comMpPLicata, Salter. 
Mem. Geol. Surv., vol. ii., pt. i., p. 352. 
a. Original. Natural size ; view of both valves. From Bala, in Mus. Geol. 
Surv., Irel. 
b,c. Original. Enlarged figures of both valves from 3 a, and a wax impres- 
sion taken from a specimen in Lower Caradoc sandstone, from Hopesay, 
Shropshire. 
LLANDEILO and Carapoc.—Sil., fourth edition, p. 516. Localities—Llan 
Mill, Narbeth, Mus. Geol. Surv., Irel. Point-y-Meibion, M‘Coy. For 
other localities in North and South Wales, see Cat. Brit. Foss., p. 101, 
