42

FOSSIL CIRRIPEDIA.

cnlargeinent of the fixed scutum and tergum, is due to the development of a single smallportion in each valve, namely, the lower ridge of the articular ridges by which thesevalves are united together. It is very remarkable that in all the species it seems to be amatter of chance, whether the right or left hand valves undergo this singulär modification ;consequently, of every valve it is equally likely to find a right-hand or left-hand specimen ;and these, thougli exactly alike, exeept in being reversed, or in coming from opposite sidesof the body, yet, from this very circumstance, and from the fixed valves being of veryirregulär shapes, are rather perplexing to identify. This short description will, I hope,suffice to make the following descriptions intelligible.

1. Verruca Strömia. Tab. II, fig. 9 a, 9 b.

Lepas Strömia. O. Müller. Zoolog. Dan. Prod., No. 3025, 1776.

— — Ib. Zoolog. Dan., vol. iii, Tab. 94, 1789.

— striata. Pennant. British Zoology, vol. iv, Tab. 38, fig. 7, 1777.

Die warzenförmige meereichel. Spengler. Schriften der Berlin. Gesell., 1 B.,

Tab. 5, fig. 1—3, 1780.

Lepas verruca. Spengler. Skrifter af Naturhist. Selskabet, 1 B., 1790.

— — et Strömia. Gmelin. Syst. Nat., 1789.

Balanus veruca. Brvguiere. Encyclop. Meth., 1789 ; Clisia verrucosa, Deshayes, inTab.

— intertextus. Pulteney. Catalogue of Shells of Dorsetshire, 1799.

Lepas striatus. Montagu. Test. Brit., 1803.

— verruca. Wood’s General Conchology, PI. 9, fig. 5, 1815.

Verruca Strömii. Schumacher. Essai d’un Nouveau Syst. Class., 1817.

Creusia Strömia et verruca. Lamarck. Animaux sans Vertebres, 1818.

Ochthosia Stroemia. Ranzani. Memoire di Storia Nat., 1820.

Clisia striata. Leach. Encyclop. Brit. Suppl., vol. iii (sine descript.), 1824.

Clitia verruca. G. B. Sowerby. Genera of Recent and Fossil Shells, Plate.Verruca Strömii. J.E. Gray. Annals of Philosophy (new series), vol. x, Aug. 1825.

F. scuto mobili, cristd articulari inferiore dimidiam brevis cristce articularis superiorislatitudinem non cequante : testäplcrumque longitudinaliter sulcata.

Moveable scutum, with the lower articular ridge not half as broad as the short upperarticular ridge: shell generally ribbed longitudinally.

Fossil in Glacial deposits of Scotland, Mus. Lyell; Red Crag (Walton, Essex), Coralline Crag (Sutton),Mus. S. V. Wood.

Recent on the shores of Great Britain and Ireland; Shetland Islands; Denmark; Iceland; shoresof northern Europe ; Red Sea. Attached to shells, laminarise, rocks, crabs, and floating bark, from lowtidal mark to fifty or ninety fathoms.

I liave seen a perfect specimen of this species from the Glacial deposits of Scotland, and