210 CRETACEOUS LAMELLIBRANCHIA. 
of such ribs m only a few specimens. A typical form is figured by Bayle; it 
agrees perfectly with specimens from the Cenomanian of Rouen and Orbiquet 
which have been sent me by M. Fortin, and with others from the Cenomanian of 
Le Havre, sent by M. A. de Grossouvre. 
Remarks.—Morris referred the specimens from the Upper Greensand, which 
Sowerby figured as P. quinquecostatus (figs. G—8), to this species, but they are 
clearly distinguishable by the presence of six main ribs, and by the concentric 
ornamentation. 
T'ypes.—Lamarck’s types came from the Cenomamian of Le Mans, and from 
near Angers. Goldfuss’ specimens came from the Quader-sandstone near Dresden, 
and the Greensand of Regensburg. 
Distribution.—Upper Greensand (Chert Beds, zone of Pecten asper) of Haldon, 
of Worbarrow, and Warminster. Chloritic Marl of Maiden Bradley. 
Pucren (Nerrana) quapricostatus, Sowerby, 1814. Plate XL, figs. 6, 7. Text-figs. 
D. 
9 
(3) 
1806. (Figure without name), J. Sowerby. British Mineralogy, vol. ii, p. 159, 
pl. elxxxiii. 
1814. Prcren guapricostata, Sowerby. Min. Conch., vol. i, p. 122, pl. lvi, 
figs. 1, 2. 
1833. — quapricostatus, A. Goldfuss. Petref. Germ., vol. ii, p. 54 
(partim), pl. xeu, fig. 7. 
1837. — quapricostata, H. G. Bronn. Lethea Geogn, p. 680, pl. xxx, 
fig. 16. 
1839. — quapricostatus, H. B. Geinitz. Char. d. Schicht. u. Petref. des 
siichs. Kreidegeb., pt. 1, p. 22. 
1841. -— — F. A. Rimer.  Verstein. des nord-deutsch. 
Kreidegeb., p. 54. 
1843. — — H. B. Geinitz. Die Verstein. von Mieslingswalda, 
p. 16, pl. iii, figs. 14, 15. 
1846. — ~- Geinitz. Grundriss der Verstein., p. 469. 
a — versicostatus, A. H. Reuss. Die Verstein. der bohm. Kreide- 
format., pt. 2, p. 31 (? partim). 
1850. Jantra Gurnirazn, A. d’Orbigny. Prodr. de Pal., vol. ii, p. 197. 
1850-51. Nerruea Qquapricostatus, H. G. Bronn. Lethwa Geogn., ed. 3, vol. il, 
pt. 5, p. 277, pl. xxx, fig. 16. 
1853. Janrra Faucranyana, F. J. Pictet and W. Roux. Moll. Foss. Gres verts 
de Genéve, p. 505, pl. xlv, fig. 2. 
1854. Proren quapricosratvs, J. Morris. Cat. Brit. Foss., ed. 2, p. 177. 
1863. — = A. Kunth. Zeitschr. d, deutsch. geol. Gesellsch., 
vol. xv, p. 725. 
