POLYSTOMELLA MACELLA. 357 



PI. II, figs. 40 and 41, represent the typical form of P. crispa ; in figs. 42 and 

 43 we have a smaller and relatively thicker form, more compressed, and retaining 

 more of the characters of P. striatopunctata. 



Occurrence. — Polystomella crispa is very common, and has practically a world- 

 wide range, but is confined to comparatively shallow waters. The bathymetrical 

 range extends from the littoral zone to 355 fathoms ; it is one of the most common 

 species on our own coasts. 



Fossil specimens have been recorded from the Eocene of the Paris Basin ; from 

 the Oligocene of Germany ; from the Miocene of Malaga, Italy, Vienna, and else- 

 where ; from the Pliocene of Italy, Spain (Garrucha), and St. Erth ; and from 

 the Pleistocene generally. We have met with the species in every zone of the 

 Coralline Crag examined ; and, as recorded in the First Part of the Monograph, it 

 occurs throughout the Upper Crag. 



4. Polystomella macella {Fichtel and Moll), 1803. Plate VII, figs. 35 a, b. 



Part I, 1866, Appendices I and II, Tables, No. 96. 



Ammonia seu Nautilus, &e, Soldani, 1780. Saggio Oritt., p. 104, pi. iii, fig. S. 

 Nautilus striatus communis, Soldani, 1789. Testaceographia, vol. i, pt. i, p. 54, 



pi. 34, fig. cc. 

 — macellus, Fichtel and Moll, 1798. Test. Micr., p. 66, var. a, pi. x, 



figs, e — y ; var. /3, pi. x, figs, h — Jc. 

 Elphidium (L'Elphide soufle), Montfort, 1808. Conchy]. System., vol. i, p. 14, 



genre 4. 

 Geophonus (Le Geopone jaune), Montfort, 1808. Ibid., p. 18, genre 5. 

 Polystomella planulata, Lamarch, 1822. Anim. sans Vert., vol. vii, p. 625, 



No. 3. 



— macella, Blainville, 1824. Diet. Sci. Nat., vol. xxxii, p. 183. 



— planulata, Blainville, 1824. Ibid., Atlas Conch., pi. xv, fig. 8. 



— macella, Blainville, 1825. Malac, p. 388. 



— planulata, Blainville, 1825. Ibid., pi. vii, fig. 8. 

 Nautilus macellus, Wood, 1825. Index Testae, p. 63, pi. xiv, fig. 45. 

 Polystomella stbigilata (in part), d'Orbigny, 1826. Ann. Sci. Nat., vol. vii, 



p. 284, No. 4. 



— Lessonii, d'Orb., 1826. Ibid., No. 6. 



— — — 1840. Foram. Amer. Merid., p. 29, pi. iii, 



figs. 1, 2. 



— Fichteliana, d'Orb., 1846. For. Foss. Vien., p. 125, pi. vi, 



figs. 7, 8. 



— Oetenbuegensis, Egger, 1857. Neues Jahrb. fur Min., Ac, 



p. 302, pi. xv, figs. 7, 9. 



