112 HALKYARD, Fossil Foraminifera of the Blue Marl 



269. Discorbina saulcyi, (d'Orbigny.) 



Rosalina saulcyi, d'Orbigny, 1839, Voyage Amer. Merid., vol. 



V, pt. 5, "Foraminiferes," p. 42, >pl. II, figs. 9-11. 

 Discorbina saulcyi, Brady, 1884, Chall. Rep., vol. IX, p. 653, 



pi. XCI, figs. 6a, b, c. 



Small and rare but fairly well distributed. 



270. Discorbina vilardeboana, (d'Orbigny.) 



Rosalina vilardeboana, d'Orbigny, 1839, Voyage Amer. Merid., 

 vol. V, pt. 5, "Foraminferes," p. 44, pi. VI, figs. 13-15. 



Discorbina vilardeboana, Brady, 1884, Chall. Rep., vol. IX, p. 

 645, pi. LXXXVI, figs. 9, 12; and pi. LXXXVIII, fig. 2. 



Very rare, only two small specimens found in the whole of 

 the samples of Marl examined. 



271. Discorbina rugosa, (d'Orbigny.) 



Rosalina rugosa, d'Orbigny, 1839, Voyage Amer. Merid., vol. 



VI, pt. 5, "Foraminiferes," p. 42, pi. II, figs. 12-14. 

 Discorbina rugosa, Brady, 1884, Chall. Rep., vol. IX, p. 652, 



pi. LXXXVII, figs. 3a, b, c, and pi. XCI, fig. 4a, b, c. 



Rare and small, it seems to be limited to the upper portion 

 of the Marl. 



(The specimens can hardly be described as typical.) 



272. Discorbina globularis, (d'Orbigny.) 



Rosalina globularis, d'Orbigny, 1826, Ann. Sci. Nat., vol. VII, 



p. 271, No. 1, pi. XIII, figs. 1-4. 

 Discorbina globularis, Brady, 1884, Chall. Rep., vol. IX., p. 



643, pl- LXXXVI, figs. 8, 13. 



Rare, but fairly distributed, specimens typical and well 

 developed. 



(The specimens are all of the thick-walled highly perforate 

 type.) 



273. Discorbina opercularis, (d'Orbigny.) 



Rosalina opercularis, d'Orbigny, 1826, Ann. Sci. Nat., vol. 



VII, p. 271, No. 7. 



Discorbina opercularis, Brady, 1884, Chall. Rep. vol. TX, p. 



650, pl. LXXXIX, figs. 8, 9. 



This form requires no special remark except that it is rare 

 and occurs chiefly in the lower beds. 



