SPONDYLUS. 127 
the Trimingham Chalk appear to have the spines placed more closely together 
than in other zones. The convexity of the valves varies considerably. The 
largest examples seen came from the B. iweronata zone of Norwich and Shering- 
ham. <A few imperfect specimens obtained from the Chalk Marl of Folkestone 
probably belong to this species. 
Types.—F rom the Senonian of Epernay, St. Sauveur, and Auxon. 
Distribution—Cenomanian (Bed 11) of Maynard’s Cliff, Sidmouth. Zone 
of It. Cuviert of the Sussex coast. Zone of Terebratulina gracilis of St. Giles’ 
Pit, near Winchester, and Dover. Zone of H. planus of Twyford Down, near 
Winchester, and Chapel Rock, Pinhay. Zone of M. ror-testudinarium of Dover. 
Zone of M. cor-anguinum of the Thanet coast, St. Margaret’s, and the Sussex 
coast. Uintacrinus-band of Kingsgate (Margate). Zone of Marsupites of the 
Thanet and Sussex coasts. Zone of Actinocamar quadratus of Hursley (Win- 
chester), Hast and West Harnham (Salisbury), and the Sussex coast. Zone of 
B. mucronata of Norwich, Sheringham, Clarendon (Salisbury), Ballard, and 
Studland. Chalk of Trimingham. 
Sponpyius spinosus (Sowerby), 1814. Plate XXIII, figs. 6—11; Plate 
XXIV, figs. 1—7. 
1814. Puacrostoma spinosa, J. Sowerby. Min. Conch., vol. i, p. 177, pl. Ixxviul, 
fies. 1—3. 
71819. Sponpytvus popopsipEus, Lamarck. Anim. sans Vert., vol. vi, p. 194. 
y — Puaaiostoma suucata, Lamarck. Ibid., p. 161. 
1820. Prcrrnrres acuLratus, FE. T. v. Schlotheim. Die Petrefactenkunde, p. 228. 
1822. PxLaariosroma spinosa, G. Mantell. - Foss. 8S. Downs, p. 205, pl. xxvi, 
fig. 10. 
— — BRIGHTONIENSIS, G. Mantell. Tbid., p. 204, pl. xxv, fig. 15. 
— — spinosa, A. Brongniart. Deser. géol. des Envir. de Paris, 
pp. 251, 320, 600, pl. iv, fig. 2. 
1825. Pacuyros sprnosus, Defrance. Dict. Sciences uat., vol. xxxvu, p. 207, 
pl. Ixxviii, fig. 2; pl. Ixxix, fig. 1. 
> — — striatus, Defrance. Ibid., p. 207. 
1827. Puacrosroma sprnosum, S. Nilsson. Petrif. Suecana, p. 25. 
1835 — — S. Woodward. Geol. Norfolk, p. 40, pl. v, fig. 25 
(? young). 
1836. Sponpyius sprnosus, A. Goldfuss. Petref. Germ., vol. ii, p. 95, pl. ev, 
fig. 5. 
— —_ pupLicatus, A. Goldfuss. Ibid., vel. ii, p. 95, pl. ev, fig. 6. 
1837. Pxiaciosroma sprnosum, W. HMisinger. Lethea Suecica, p. 54, pl. av, 
fig. 4. 
—  Sponpyuus srinosus, H. G. Bronn. Lethwa Geog., p. 684 (ed. 2), p. 280 
(vol. ii, pt. 5, ed. 3), pl. xxxil, fig. 6. 
