Plate 3

Globuligerina balakhmatovae (Morozova) in Middle and Late Jurassic strata. Nos. 1, 4a, 4b and 5, cuttings sample 8360 ft. Eider well, Grand Banks, Bajocian-Bathonian; umbilical view and spiral views with 10 µm scale bar and wall texture image with 2 µm scale bar. Wall texture varies from relatively smooth to densely pustulose, with pustules merging into short ridges. No. 2, sample 24/2P, Tojeira Fm. Montejunto, Portugal, early Kimmeridgian; scale bar 20 µm; wall texture coarsely pustulose. No. 3, swc sample 5000 ft., Bittern well, Grand Banks, Callovian–early Oxfordian; note the coarse pustulose test and oblong chambers, final one becoming pointed. Nos. 6–8, Tojeira Formation, Montejunto, Portugal, early Kimmeridgian. No. 6, oblique umbilical view with low arch aperture with lip, sample T1/4 Gradstein sampled 2016. Nos. 7a, c, side view with ovate last two chambers becoming almost pointed and coarse pustulose to irregularly reticulate wall on umbilical face; sample 24/2P; nos. 7b, d, spiral view and enlarged, coarse pustulose wall texture