8 HALKYARD, Fossil Foraminifera of the Blue Marl 



Well-preserved typical specimens were collected both in 

 1893 and 1897, and were not infrequent though seemingly con- 

 fined to the pure marl beds forming the upper portion of the 

 formation. 



7. Spiroloculina canaliculata, d'Orbigny. 



Spiroloculina canaliculata, d'Orbigny, 1846, For. Foss. Vienne, 

 p. 269, pi. XVI, figs. 10-12. 



vS. Umbata, var., Brady, 1884, Chall. Rep., p. 150, pi. X,. 

 figs. 1, 2. 



The species is rather rare in these marls and not typical, 

 the chambers being few and broad and not so elongated as in 

 the type, approaching more the form figured by Brady under 

 the name "S. Umbata, var," though not so circular in contour. 

 The oval extremity of the final chamber is slightly prolonged 

 and connected with the periphery of the penultimate chamber 

 by a web such as is seen in Brady's figures of Spiroloculina 

 acutimargo. * 



7A. [Spiroloculina planulata (Lamarck).] 



[Miliolites planulata, Lamarck, 1804, AM. p. 352, No. 4, 1816, 

 etc., Animaux sans vertebres, Paris, 1822, vol. VII. p. 613, 

 No. 4. 



Spiroloculina planulata, Brady, 1884, FC. p. 148, pi- IX, fig. 11 

 a, b.] 



8. Spiroloculina arenaria, Brady. 



Spiroloculina arenaria, Brady, 1884, Chall. Rep., p. 153, pi. 

 VIII, fig. 12, a, b. 



One specimen has been found which must be assigned to 

 this species. Owing to the somewhat imperfect condition of 

 the example, the produced shelly aperture as figured by Brady 

 is wanting and on one side of the test the sutures of the cham- 

 bers could not be made out. The other side and the contour 

 of the transverse section as seen in a view taken from the oval 

 end of the test agree well with Brady's drawings. After making 

 drawings, which, however, do not appear in illustration of 

 this paper, the specimen was broken up to obtain further evi- 

 dence of identification, which corroborated the opinion formed 

 upon the external features of the shell. 



* 1884, Chall. Rep., pi. x. figs. 12-15. 



