OSTREA. 389 



1881. OsTREA ACUTiROSTKis viir. iNFLEXA, EtJiericlge. Ibid., p. 146, pi. iii, 



figs. 7. 8. 



1888. — coRviROSTRis, .4. Peron. Hist. Terr, de Craie S.E. Bassin Anglo- 



Parisien, p. 173 {partim). 



1889. — — 0. Griepenhet-l. Senou. v. KonigsluUer (Paloeout. 



Abhaudl., vol. iv), p. 34, pi. ii, 

 fig.l. 

 1891. — — J. BiiJim. Palseoutographica, vol. xxxviii.p. 92, pi. iv, 



fig. 5. 



— — ACUTiROSTRis, Bijhvi. Ibid., p. 92, pi. iv, fig. 11. 



1894. — — B . Ltuuhjren. IsloWnsk. '\ mammillatiis ochmucronata 



zonerua, p. 39. 



— — cuBviROSTRis, LiuidgreH. Ibid., p. 40. 



— — scANiENSis, Lundgren. Ibid., p. 40. 



— — ccRviROSTEis, A. Hfiinlg. Geol. Poreu. i Stoelcholm Furhaudl., 



vol. xvi, p. .514. 



— — ACUTIROSTRIS, HeiDiig. Ibid., p. 514. 



1895. — CORVIROSTRIS, F. Vogel. Holliindiseh. Kreide, ]>. 5. 



— — ACUTIROSTRIS, Vogel. Ibid., p. 5. 



— — SCANIENSIS, Vogel. Ibid., p. 6. 



1897. — iNCURVA, A. Hennig. Revis. Lamellibr. i Nil.'ssou's "Petrif. 



Suecana," p. 11, pi. i, figs. 15, 17, 21 — 

 23, 25—28. 



— — ACUTIROSTRIS, F. NotUug. U. Cret. (Maestriclitian) Mari Hills 



(Palseont. Indica, ser. xvi, vol. i), 

 p. 37, pi. is, figs. 1, 9. 



1899. — — G. de Alessandri. Palseont. Italica, vol. iv, p. 198. 



1901. — cuRviiiosTRis, n. Tml-eller. Palseoutograpliiia, vol. xlviii, p. 37. 



— — ACUTIROSTRIS, Iitil-eller. Il)id., p. 37. 



? 1902. — — A. Quaas. Palaeontographica, vol. xxx, 2, p. 184, 



pi. xxi, fig. 11. 



— — — E. Bacgw'. Ibid., p. 363. 



— — INCURVA, /.P. /. i2au«. Mollusk. i Danmarks Kridtafl., I, Lamellibr. 



p. 112, pi. iii, fig. 4. 

 1906. — — E.Biise. Senon. Cardenas (Bol. Inst. geol. Mexico, No. 24), 



p. 42, pi. i, fig. 5. 



1908. — cuRviBOSTRis, A. Peron. Compte Rendu Assoc. Fran9. Avanc. 



Sciences, vol. xxxvi (1907), p. 306. 



— — — M. Leriche. Ibid., p. 338 (jmrlim). 



1909. — INCURVA, W. Rogala. Bull. Inteniat. Acad. Sci. Cracovie (1909), 



2. p. 691. 



Description. — Shell tliin, usually higher than long ; its form very variable, 

 depending on the character and size of tlie attached surface. 



The left valve is flat when attached thi-oughout to a flat surface ; concave Avhen 

 attached to a convex surface ; convex when attached to a concave surface or 

 when attached to only a small object near the umbo ; irregular when attached to an 



51 



