324 APPENDIX. 



Pecten polymorphus, Bronn. Tab. XXXI, fig. 20. 



Pecten polymorphus. Bronn. Reise, p. 627, sec. Phil. 



— striatus. Marcel, de Serr. Geog. des Terr. Tert. du Midi de la France, p. 131. 



— striatums. Lamarck. Sec. Philippi. 



— iNjEQUicostalis. Id. Sec. Philippi. 



— Isabella. Lamarck. Sec. Philippi. 



— flagellatus. Id. Sec. Philippi. 



— flexuosus. Id. Sec. Philippi. 



— polymorphus. Phil. En. Moll. Sic, vol. i, p. 79, t. 5, figs. 18 — 21. 



— — Dixon. Geol. of Sussex, p. 16, fig. .3, 1850. 



— — Sismond. Syn. Meth. Inv. Ped., p. 13, 1847. 

 Ostrea striata? Brocchi. Conch. Foss. Subap., p. 577, t. 16, fig. 17. 



— discors. Id. Conch. Foss. Subap., p. 581, t. 14, fig. 13. 



— coarctata. Id. Conch. Foss. Subap., p. 574, t. 14, fig. 9. 



— plica. Poli. Utr. Sic, t. 28, figs. 1 — 5. A 



Spec, Char. " Testa subcequivalvi, siiborbicidari, latiore quam longd, longitudinaliter undulato- 

 piicatd, striatd aut Icevi, plicis 5 — 12, auriculis amplis subcequalibus, utraque basi angustatd ; i.e., sinu 

 anyulum rectum formante a lateribus divisd." — Philippi. 



Shell nearly equivalve, suborbicular, broader than long, longitudinally ribbed or plicated ; ribs 5 — 12 ; 

 auricles large and slightly unequal, and angulated at the base on each side. 



Diameter, 1 inch. 



Locality. Bracklesham. 



This shell is, I believe, not very rare at the above locality, to which place, as far as I know, it appears 

 to be restricted, as a British fossil. 



It much resembles P. Danicus, and is, like it, subject to great variation ; it differs, however, more 

 especially in its auricles, which are larger and more equal. 



This is a living species in the Mediterranean, and is found fossil at Graviua, according to Philippi. 



The specimen figured is in the British Museum. 



Limopsis pygm^ea. Ante, p. 71. 



This is no longer an extinct species ; it has been recently obtained alive by Mr. M 'Andrew in the 

 Arctic Regions. 



Lucina columbella. Ante, p. 143. 



I have been unable to obtain any further information respecting the integrity of this species. Its claim 

 to the Red Crag is, I suspect, very doubtful. 



Cryptodon sinuosum. Ante, p. 134. 



At the above reference the Older Tertiary shell, Lucina Goodallii, was considered only as a variety, as 

 also the Boom shell, Axinns Benedenii, De Koninck, and both were introduced as synonyms to the above 

 Crag fossil. A better examination with fresh specimens induces me now to believe them distinct. 



