Manchester Memoirs, Vol. Ixii. (191 7) 83' 



intimate relationship with M. glabra, d'Orb., which affinity is 

 clearly seen in the Biarritz specimens. At the best it is but an 

 aberrant member of the genus Cristellaria, as its transverse sec- 

 tion is always circular and not compressed, and it is never truly 

 spiral at the commencement. These two points taken together 

 are important. 



(We should have no hesitation whatever in referring these- 

 specimens to Marginulina glabra.) 



184. Marginulina injequalis, Reuss. 



Marginulina incequalis, Reuss, i860. Sitz. k. Ak. Wiss. Wien, 



vol. XL, p. 207, pi. VII, fig. 3. 

 M. incequalis, Chapman, 1894, Journ. Roy. Micr. Soc, p. 160, 

 pi. IV, fig. 12. 



Specimens are rare in my Gatherings and vary consider- 

 ably in form. 



185. Marginulina parkeri, Reuss. 



Marginulina parkeri, Reuss, 1862 (1863), (1), Sitz. k. Ak. Wiss. 



Wien, vol. XLVI, p. 59, pi. V, fig. 14a, b. 

 M. parkeri, Chapman, 1898, Journ. Rov. Micr. Soc, p. 13, ph 



II, fig. 8. 



This species is rarely found in the Biarritz Marls but is so 

 typical that it is not easily confounded with other species occur- 

 ring in the same Gatherings. 



186. Marginulina tumida, Reuss. 



Marginulina tumida, Reuss, 1851. Zeitschr, deutsch. geol. Ges., 

 vol. Ill, p. 64, pi. Ill, fig. 14. 



Rather rare. Forms a connecting link between the last 

 named species and M. linearis, Reuss. 



187. Marginulina linearis, Reuss. 



Marginulina linearis, Reuss, 1862 (1863). Sitz. k. Ak. Wiss. 



Wien. vol. XLVI, (1), p. 60, pi. V, fig. 15a, b. 

 M. linearis, Chapman, 1894, Journ. Roy. Micr. Soc, p. 161, 



pi. IV, fig. 14. 



Rare and found chiefly in the upper portion of the MarL 



