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. 



STRIATULUS. 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. Fed., 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. 



Spec. Char. " Testa subeequivalvi, suborbiculari, latiore quam longd, longitudinaliter undulato- 

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

 angulum 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 Gravina, according to Philippi. 



The specimen figured is in the British Museum. 



LIMOPSIS PYGM^A. 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. 



