BIVALVIA. 41 
have been P. Princeps, by Woodward, were, probably, only portions of specimens 
of this shell which sometimes attains a magnitude of four inches in diameter, a size 
that might well lead to such an error. 
Our figure is taken from a magnificent specimen found in the beds of the Clyde, 
and now in the Museum of the Geological Society, presented by James Smith, Esq., 
of Jordan Hill. 
13. PecTEN vARIuS, Linneus. 
Osrrea vaRta. Linn. Syst. Nat., ed. 12, p. 1146, No. 199, 1767. 
—_— — Poli. Test. Sic., vol. ii, p. 163, t. 28, fig. 10, 1793. 
— —_— Don. Brit. Shells, vol. i, pl. 1, fig. 1, 1799. 
— — Shaw. Nat. Miscel., vol. 23, fig. 993. 
ae, — _— Mawe. Linn. Conch., pl. 14, fig. 4, 1823. 
— —_ W. Wood. Ind. Test., p. 50, pl. 10, fig. 31, 1825. 
— — Burrow. Elem. Conch., p. 144, pl. 9, fig. 2, 1815. 
PEcTEN vARIUS. Chem. Conch. Cab., vii, p. 331, pl. 66, figs. 633, 634, 1782. 
— — Crouch. Int. Lam. Conch., p. 12, fig. 4, 1827. 
—_ — Brown. Mlust. Conch. Gr. Brit., pl. 33, fig. 4, 1827. 
a — Phil. En. Moll. Sic., vol. i, p. 84, 1836. 
— — J. Smith. Mem. Wern. Soc., vol. viii, p. 46, 1838. 
— — G. B. Sow. Conch. Man., fig. 171, 1843. 
— a Id. Thesaur. Conch., vol. i, p. 76, pl. 19, fig. 214, 218, 1847. 
— — Thorpe. Brit. Mar. Conch., p. 118, 1844. 
— — Phil. En. Moll. Sic., vol. ii, p. 58, 1844. 
_ — Lovén. Ind. Moll. Scand., p. 30, 1846. 
— — Alder. Cat. Moll. North. and Durh., p. 77, 1848. 
— — Forb. and Hanl. Hist. Brit. Moll., vol. 2, p. 273, pl. 0, fig. 1, 1849. 
— monotis. Dacosta. Brit. Conch., p. 151, pl. 10, figs. 1, 2, 4, 5, 7, 9, 1778. 
Spec. Char. Testé rotundato-ovata, equivalvi, equilaterali, radiata ; radiis 26—80, 
subcompressis, sguamoso-scabris ; auriculd alterd minima. 
Shell roundedly ovate, equivalve, equilateral, ornamented with 26—30 subcom- 
pressed rays, which are covered with squamose imbrications ; ears unequal. 
Locality. Clyde Beds. Recent, North Seas, Britain, and Mediterranean. 
This is given by Philippi, as a living species in the Mediterranean, and enumerated 
by Lovén, as an inhabitant of the Coast of Scandinavia; but it has not yet, that I am 
aware of, been found in either of the three deposits of the Crag. As it is undoubtedly 
a fossil, in the Clyde Beds, and found frequently in the upper Tertiaries of Sicily, it 
may, probably, yet be discovered in the Red or Mammaliferous Crag in our own 
country. It would not, however, be here introduced simply upon such anticipation, 
but it is claimed as one of the fossils of our upper Tertiaries. 
