258 Transactions of the Society. 



Cristellaria calcar Linne sp. 



Nautilus calcar Linne, 1767, Syst. Nat., 12th ed., p. 1162, No.. 

 272. N. calcar (Linne) Fichtel and Moll, 1803, Test. Micr., p. 69,. 

 pi. xi. figs, a, b,c; pi. xii. figs, i, h ; pi. xiii. figs, c, d, h, i. Cristel- 

 laria calcar (Linne) Parker and Jones, 1857, Ann. and Mag. Nat. 

 Hist., ser. 2, vol. xix. p. 289, pi. x. figs. 10-12. C. calcar (Linne) 

 Brady, Parker, and Jones, 1888, Trans. Zool. Soc, vol. xii. p. 224, 

 pi. xliv. fig. 14. C. calcar (Linne) Terrigi, 1891, Mem. E. Com. 

 Geol. Italia, vol. iv. p. 96, pi. iii. fig. 16. C. calcar (Linne) Egger, 

 1895, 'Naturhist. Ver. Passau, Jahresber., xvi. p. 27, pi. iii. figs. 1, 2. 

 C. calcar (Linne) Dervieux, 1896, Mem. Pontif. Accad. Nuovi 

 Lincei, vol. xi. pi. xiv. fig. 5. C. calcar (Linne) Hint, 1899,. 

 Pep. U.S. Nat. Mus. for 1897 (1899), p. 318, pi. lxvi. fig. 1. C. 

 calcar (Linne) Egger, 1899, Abhandl. k. bayer. Akad. Wiss.,, 

 CI. II. vol. xxi. p. 123, pi. xi. figs. 17, 18. C. calcar (Linne) 

 Fornasini, 1902, Mem. E. Accad. Sci. 1st. Bologna, ser. 5', vol. x.. 

 p. 46, fig. 45. 



Found only at Station 2 in Area 1. The examples, although 

 few and small, are characteristic ; the varieties a and k of Fichtel 

 and Moll both being represented. 



Cristellaria costata Fichtel and Moll sp. 



Nautilus costatus Fichtel and Moll, 1803, Test. Micr., p. 47, 

 pi. iv. figs, g, h, i. Cristellaria costata (F. and M.) Parker and 

 Jones, 1860, Ann. and Mag. Nat. Hist., ser. 3, vol. v. p. 113, No. 19. 

 C. costata (d'Orb.) Crick and Sherborn, 1891, Journ. Northamp. 

 Nat. Hist. Soc, vol. vi. p. 213, pi. fig. 20. C. arimincnsis (d'Orb.) 

 Fornasini, 1894, Mem. E. Accad. Sci. 1st. Bologna, ser. 5, vol. iv. 

 p. 223, pi. iii. figs. 36-38. C. costata (F. and M.) Fornasini, 1895, 

 Palreont. Italica, vol. i. p. 146, pi. vii. fig. 13. C. costata (F. and M.) 

 Silvestri, 1899, Mem. Pontif. Accad. Nuovi Lincei, vol. xv. p. 218,. 

 pi. i. fig. 13. C. costata var. spinata Schubert, 1899, Sitzungsber. 

 Peutsch. naturw.-med. Ver. fur Bohmen, " Lotos " No. 6, p. 16, 

 pi. v. fig. 7. 



Simply because they are ribbed, two very different forms have 

 been associated under this name. The Nautilus costatus of Fichtel 

 and Moll is lenticular and may be described as being a variety of 

 Cristellaria calcar bearing concentric costse. Closely allied, if not 

 identical with this, is the Robulina arimincnsis of d'Orbigny. 



The Cristellaria costata of d'Orbigny represented by Modele 

 No. 84, is a more elongated form, and as interpreted by subsequent 

 authors is nothing more nor less than a costate Marginulina or 

 Vaginulina. Of this variety good examples from the lias are 

 figured by Brady, 1867, and by Crick and Sherborn, 1891. 



