24 HALKYARD, Fossil Foraminifera of the Blue Marl 



41. Haplophragmium concavum, Bagg. 



Haplophragmium concavum, Bagg., 1898, Cretaceous Foram. 

 of New Jersey, p. 27, pi. II, figs, ia, ib, U.S., Geol. 

 Survey, Bulletin, No. 88. 



This species is rare in the Biarritz Marl. It seems, by 

 its form, to grow lightly attached to some foreign body, though 

 I must say that I have not found it so growing, possibly its 

 only attachment is by the living sarcode. It is an isomorph 

 of Placopsilina cenomana, d'Orb., from which it is chiefly dis- 

 tinguished by its more robust character, and more close- 

 cemented shell-wall. It has also a proper shell wall on the 

 inferior or attached surface, which is generally slightly con- 

 cave. 



My specimens have more chambers and are more irregular 

 in growth than that figured by Bagg, and are also rougher in 

 texture judging from his drawings. 



(Halkyard's specimens are rather striking, but the texture 

 of the shell appears to us to be much too rough to identify 

 them with Bagg's species, as shown in his figure. The possi- 

 bility that both Halkyard's and Bagg's specimens may be 

 merely detached and abnormal Placopsilina: requires to be 

 considered in connection with a larger series of specimens than 

 is available.) 



42. Haplophragmium rugosum, (d'Orbigny). 



Robulina rugosa, d'Orbigny, 1826, Ann. Sci. Nat., VII, p. 290, 



No. 21. 

 Haplophragmium rugosum, Brady, 1888, Quart. Journ. Geol. 



Soc, vol. XLIV, p. 4, pi. I, fig. 2. 



A few examples of this form, with coarse arenaceous 

 walls, and chambers hardly discernible on the exterior, were 

 found in the miscellaneous Gatherings of 1893 an d l &97- 



(The Biarritz specimens are all very coarsely agglutinate 

 as compared with either Soldani's or Brady's figures, but the 

 identification is, we think, admissible.) 



43. Haplophragmium tumidum, sp. nov. 

 PI. i, fig. 9. 



Test spiral, nautiloid, thick in the centre, thinning rapidly 

 towards periphery which is obtusely rounded. Segments few, 

 of which the last convolution completely encloses the preced- 



