CYPRICARDINIA. 
5 
II. Family. — Cyprinid^, Gray, 1840. 
1. Genus. — Cypricardinia, Hall, 1859. 
This appears to be a very well-marked genus, although its characters are only 
partially known. It is very like Gypricardia, Lamarck, but thinner. It is in- 
equivalve ; its umbo is small and more or less anterior ; it has a dorsal keel, and 
is covered with concentric ridges and sometimes with finer radiating ornament. 
It reaches from the Silurian to the Carboniferous. 
The species of this genus seem for the most part to show a large amount of 
individual variation, and hence it is not easy to define their limits, especially where 
specimens come from different countries. 
In our present localities it is represented by at least four species. 
1. Cyprioaedtnia soalaris, Phillips, sp. PI. I, figs. 6 — 8. 
1841. MoDioLA scALAKis, Phillips. Pal. Foss., p. 137, pi. Ix, fig. 62*. 
? 1842. Ctpkicaedites indenta, Conrad. Journ. Acad. Nat. Sci. Philad., vol. viii, 
p. 244, pi. xii, fig. 12. 
? 1842. — INPLATA, Conrad. Ibid., p. 246, pi. xv, fig. 2. 
1849. Mytiltjs scalaeis, d'Orhigny. Prodrome, vol. i, p. 82. 
1850. CypEiCAEDiA SQUAMiFEEA, F. A. Bomer. Beitr., pt. 1, p. 33, pi. v, 
figs. 4 a, h. 
1850. — EioNGATA, F. A. Bomer. Beitr., pt. 1, pi. v, figs. 4 a, b. 
1851. Omalia scalaeis, de ByckhoU. Melang. Pal., pt. 2, p. 74. 
1853. Cypeicaedia eamellosa, Sandherger. Verst. Eheiu. Nassau, p. 262, 
pi. xxvii, figs. 13, 13 a — e. 
1854. MoDioLA SCALAEIS, Morris. Catal. Brit. Poss., p. 210. 
1861. Cypeicaedinia lamellosa, Hall. Pal. N. T., vol. iii, p. 266, pi. xlixA, 
fig. 1 a — c. 
? 1870. Cypeicaedinia indenta, Hall. Prelim. Notice Lamellibr., pt. 2, p. 83. 
? 1874. — DISTINCTA, Billings. Palaeozoic Possils, vol. ii, pt. 1, p. 56, 
figs. 26, 27. 
? 1881. — Geatiosa, Barrande. Syst. Sil. Boliem., vol. vi, pt. 1, 
pi. cclvii, figs. 1, i-u, Et. P. 
1884. — lamellosa, Clarice. Neues Jahrb. f. Min., Beil.-Band iii, 
p. 380. 
? 1885, — SQUAMIFEEA, Mauver. Abhand. Grossh. Hessisch. Geol. 
Landes. Band i, pt. 2, p. 231, 
pi. ix, figs. 30—33. 
1885. — INDEUTA, Hall. Pal. N. T., vol. v, pt. 1, sect. 2, p. 485, 
pi. Ixxix, "figs. 6 — 16, 23 ; aud pi. xcvi, 
fig. 2. 
1888. MoDTOLA SCALAEIS, Ftherldge. Poss. Brit., vol. i Pal., p. 161. 
