POLYSTOMELLA MACELLA. '667 



PL II, figs. 40 and 41, represent tlie typical form of P. crista; in figs. 42 and 

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

 more of the characters of P. striatopuncfata. 



Occurrence. — Pohjstomella 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 3-55 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. Brth ; 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 «, b. 

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



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

 Nautilus sfriatus commu7iis, Soldani, 1789. Testaceographia, vol. i, pt. i, p. 54, 



pi. 34, fig. cc. 

 — MACELLUS, Fichtel and Moll, 179S. Test. Micr., p. G6, var. a, pi. x, 



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

 Elphidium (L'Elphide soufle), Montfort, 1808. Conchy 1. System., vol. i, p. 14, 



genre 4. 

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

 PoLTSTOiiELLA pIjANUlata, Lamarch, 1822. Anim. sans Vert., vol. vii, p. 625, 



No. 3. 



— MACELLA, Blainville, 1824. Diet. Sci. Nat., vol. sxxii, p. 183. 



— TLANULATA, Blaiuville, 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. G3, pi. xiv, fig. 45. 

 PoLXSTOiiELLi STEIGILATA (in part), d'Orligny, 1826. Ann. Sci. Nat., vol. vii, 



p. 284, No. 4. 



— Lessonii, d'Orh., 182G. Ibid., No. 6. 



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



figs. 1, 2. 



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



figs. 7, 8. 



— ORTENBUHGEysrs, 'Egger, 1857. Neues Jahrb. fiir Min., &c., 



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



