7 6 HALKYARD, Fossil Foraminifera of the Blue Marl 



Small and rare, out of the eight examples found seven were 

 in material from No. 8 Station, which is one of the lowest in 

 the Marl. 



(The specimens though small and distorted by compression 

 are fahly typical.) 



163. Nodosaria (Dentalina) obliquata (Batsch). 



Nautilus (Orthoceras) obliquatus, Batsch, 1791, Conch. See- 

 sandes, pi. II, figs. 5a, d. 



Nodosaria obliquata, Fornasini, 1890, Boll. Soc. Geol. Ital. 

 \o\. IX, fasc. 1, pi. VIII, figs. 1-7. 



Rather rare. Fornasini says, "N. obliquata is dimorphic, 

 that is to say, presents itself under the two forms which it is 

 agreed to call 'A and B.' " The large majority of the 

 Biarritz specimens are of the megalospheric or "Form A" 

 type. 



(See note to 161.) 



164. Nodosaria (Dentalina) multicostata, d'Orbigny. 



Dentalina multicostata, d'Orbigny, 1840, Mem. Soc. Geol., 

 France, [1], vol. IV, p. 15, pi. I, figs. 14-15. 



D. multicostata, Brady, 1876, Carbonif. Foram., Palseont. Soc, 

 vol. XXX, p. 129, pi- X, fig. 19. 



Very rare. Only two or three fine characteristic specimens 

 were found, which are more slender in form than the original 

 figure given by d'Orbigny. 



One specimen worthy of note was found in the Gatherings 

 of April, 1897. This example consists of five segments, the 

 first one being larger than the second and furnished with a 

 short spine at the aboral extremity. The test only shows a 

 slight tendency to become dentaline. It is evident that we have 

 here the megalospheric form of this species. 



(Of the few specimens the majority are very characteristic 

 and closely resemble d'Orbigny's figure.) 



165. Nodosaria (Dentalina) vertebralis, (Batsch.) 



Nautilus (Orthoceras) vertebralis, Batsch, 1791. Conch. See- 

 sandes, pi. II, figs. 6a, b. 



Nodosaria vertebralis, Brady, 1884, Chall. Rep., p. 514, 

 pi. LXIII, fig. 35, and pi. LXIV, figs. 11-14. 

 Frequent. Found in all the Gatherings except No. 9 (1893). 



