J 1 8 HALKYARD, Fossil Foraminifera of the Blue Marl 



292. Truncatulina tenera, Brady. 



Truncatulina tenera, Brady, 1884, Chall. Rep., vol. IX, p c 665, 



pi. XCV, fig. 11a, b, c. 



Specimens few but well grown. The species can easily be 

 distinguished from its isomorph Pulvinulina umbonata, Reuss, 

 by trie different character of its oral aperture, which, in the latter, 

 is without the raised margin so general in the genus Truncatu- 

 lina. The shell-wall is also another point of difference between 

 the two genera, being - much smoother and with finer pores 

 in Pulvinulina than in Truncatulina. 



(The shell wall is rougher and much more coarsely perfor- 

 ated than in recent types.) 



293. Truncatulina pygm^a, Hantken. 



Pulvinulina pygmcea, Hantken, 1875, Mittheil Jahrb., d. k- ung. 



geol. Anstalt, vol. IV, p. 78, p. X, fig. 8. (Truncatulina 



pygmcea on plate.) 

 T. pygmcea, Brady, 1884, Chall. Rep. vol. IX, p. 666, pi. XCV, 



figs. 9-10. 



Very rare. Only two specimens found, both in the same 

 sample of Marl (No. 4.) 



294. Truncatulina tenuimargo, Brady 



Truncatulina tenuimargo, Brady, 1884, Chall. Rep., vol. IX, p. 



662, pi. XCIIJ, figs. 2-3. 



Rare. The examples found are somewhat irregular in 

 growth, the superior face being generally concave in full- 

 grown specimens and the last two chambers often very 

 deformed. The texture of the shell is smooth, and the sutures 

 and peripheral edge thickened and glassy. 



(The specimens can only be referred to this variety by con- 

 siderable latitude of identification. They are merely T . lobatula 

 with a somewhat prominent marginal edge; there is no definite 

 keel.) 



295. Truncatulina humilis, Brady. 



Truncatulina humilis, Brady, 1884, Chall. Rep., vol. IX, p. 665, 



pi. XCIV, fig. 7a, b, c. 



Very rare. Three specimens found in a single sample of 

 Marl (No. 3.) 



(Brady's species in itself, is on the author's admission, very 

 obscure, and we should prefer to regard Halkyard's few speci- 

 mens merely as immature stages of some other truncatuline 

 ispecies, possibly T . robertsoniana, Brady.) 



