Manchester Memoirs, Vol. Ixii. (19 17) 7 



This variety of B. ring ens differs from the type in having 

 the breadth of the chambers greater than the length. In 

 extreme cases the chambers are twice as broad as long. Only 

 five specimens were collected at Biarritz, and these are in the 

 form of casts in calcite or pyrites. 



(All the specimens being casts, it is not easy to state abso- 

 lutely what the external appearance of the original shell was. 

 Karrer's species is hardly separable from B. ringens. The 

 Biarritz specimens which are more suggestive of B. depressa 

 were probably even broader than Karrer's figure, but even so 

 seem hardly worth recording as a separate species). 



4. Biloculina depressa, d'Orbigny. 



Biloculina depressa, d'Orbigny, 1826, Ann. Sci. Nat. VII, p. 



298, No. 7. 

 B. depressa, Brady, 1884, Chall. Rep., p. 145, pi. II, figs. 12, 



15-17. and pi. Ill, figs. 1, 2. 



Rare, and generally badly preserved, usually occurring in 

 the form of calcite casts with a small portion of the original 

 shell-wall adhering thereto. 



(The majority of the specimens though merely casts are 

 identifiable with certainty owing to their shape.) 



Genus Spiroloculina, d'Orbigny. 



5. Spiroloculina excavata, d'Orbigny. 



Spiroloculina excavata, d'Orbigny, 1846, Foram, Foss. Vienne, 



p. 271, pi. XVI, figs. 19-21. 

 S. excavata, Brady, 1884, Chall. Rep., p. 151, pi. IX, figs. 5, 6. 



Frequent, most of the perfect specimens resembling 

 Brady's fig. 6. The examples found in the 1893 gatherings are 

 much worn and at times difficult to recognise. 



(With one or two exceptions the specimens are calcite 

 casts and specific determination can only be presumed. One 

 good and distinctive specimen from Gathering 4.) 



6. Spiroloculina impressa, Terquem. 



Spiroloculina impressa, Terquem, 1878, Mem. Soc. Geol. 



France, (3), vol. 1, p. 53, pi. V, (X), fig. 8, a, b. 

 S. impressa, Brady, 1884, Chall. Rep., p. 151, pi. X, figs. 3, 4. 



