[Illustration: Plate LXII.] PLATE LXII. Fossil Foraminifera. With the exception of figs. 23, 24, 29, 31 and 32, all the specimens delineated in this Plate belong to the Foraminifera. The figures represent magnified views; the natural size is indicated in some instances by a minute outline. Under the article "Foraminifera," in the "_Supplementary Notes_," a general account is given of the structure and economy of the living animalcules. A list of names is subjoined. Figs. 1, & 2. _Rotalia trochiliformis_, of Lamarck. Tertiary. Fig. 3. _Rotalia Beccarii_, of Linnæus. Tertiary. Fig. 4. _Cristellaria rotulata_, Lamarck. Chalk. Figs. 5, 6, 7. _Lituola nautiloidea_, Lamarck. Chalk. Fig. 8. _Spirolina depressa_, Lamarck. This and the specimens to fig. 21 inclusive, are tertiary fossils. Fig. 9. _Spirolina cylindracea_, Lamarck. Fig. 10. _Orthocerina clavulus._ Fig. 11. _Biloculina ringens_, Lamarck. Figs. 12, & 13. _Quinqueloculina cor anguinum_, Lamarck. Figs. 14, 15, & 16. _Quinqueloculina._ Figs. 17, 18, 19. _Triloculina trigonula_, Lamarck. Fig. 20. _Quinqueloculina opposita_, Lamarck. Fig. 21. _Peneroloplis opercularis_. Fig. 22. _Adelosina_, of D'Orbigny; a recent species. Figs. 23, & 24. _Gyrogonites_. The fossils here figured on a magnified scale as microscopic shells of the same family as those above described, received the name of Gyrogonites, or twisted stones. They prove to be the seed-vessels of a species of the common fresh-water plant, the _Chara_. The fruit of this genus consists of minute nuclei, with an external calcareous covering, composed of five spirally twisted plates, which unite at the summit. These fossils occur by myriads in many of the fresh-water secondary and tertiary limestones, as well as in the calcareous deposits now in progress of formation in our lakes. In the lacustrine limestones of the Isle of Wight (at Binstead, White Cliff, &c.), beautiful specimens may be obtained.[60] Professor E. Forbes has discovered Gyrogonites in the Wealden strata of the Isle of Purbeck, associated with shells of the genera _Planorbis_, _Physa_, _Paluolina_, &c. [Footnote 60: See Geological Excursions round the Isle of Wight. 2d Edit. 1850, p. 108.] Fig. 25. _Polystomella crispa_, of Linnæus. From the tertiary strata of the Apennines. Fig. 26. _Cristellaria ?_ Figs. 27, & 28. _Rotalia Beccarii_. Apennines. Fig. 30. _Cristellaria galea_, of Lamarck. Apennines. Fig. 29. Cast of a species of Area; a bivalve shell, from tertiary strata, Bordeaux. Fig. 31. A curious pteropodous shell (_Vaginella depressa_), from tertiary strata, Basterot. Fig. 32. This appears to be an imperfect specimen of a bivalve having a fibrous structure, like _Pinna_. It is probably a fragment of an Inoceramus.