82 HALKYARD, Fossil Foraminifera of the Blue Marl 



180. Vaginulina recta, Reuss, var. parallela, nov. 

 PL V, .figs. 5-6. 



This is a new variety, the characteristics of which are suffi- 

 ciently well shown in the drawings here given. It may be that 

 the elevated margins of the segments are too much accentuated 

 in the figures, but this is an error on the right side and leaves 

 no doubt as to this feature of the variety. It will be seen that 

 the lateral surfaces of the segments are flat, even in the case of 

 the primordial one, which in the type species is globular. The 

 squareness and small number of the segments ought also to be 

 noticed. The variety is very rare at Biarritz. The length of 

 the largest specimen found is .9mm., so it will be seen that this 

 variety is smaller than its type species. 



(The mere absence of an inflated primordial chamber 

 seems quite insufficient for the creation of a new variety. With 

 this exception the specimens agree very well with Reuss's 

 species, a typical Gault fossil.) 



Genus Rhabdogonium, Reuss. 

 181. Rhabdogonium tricarinatum (d'Orbigny.) 



Vaginulina tricarinata, d'Orbigny, 1826, Ann. Sci. Nat. vol. 



VII, p. 258, No. 4. 

 Rhabdogonium tricarinatum, Brady, 1884, Chall. Rep., p. 525, 



pi. LXVII, figs. 1-3. 



Specimens are small but not rare. 



Genus Marginulina, d'Orbigny. 

 182. Marginulina glabra. d'Orbigny. 



Marginulina glabra, d'Orbigny, 1826, Ann. Sci. Nat., vol. VII, 



p. 259, No. 6. 

 M. glabra, Brady, 1884. Chall. Rep., p. 527, pi. LXV, figs. 5-6. 



Frequent, and varying from short stout forms with three or 

 four segments to more slender specimens having about six 

 chambers. 



183. Marginulina cephalotes (Reuss.) 



Cristellaria cephalotes, Reuss, 1862 (1863), Sitz. k. Ak. Wiss. 

 Wien, vol. XLVI, (1), p. 67, pi. VII, figs. 5, 6. 



Very rare. In my opinion it is advisable to refer this 

 species to the genus Marginulina, chiefly on account of its 



