Manchester Memoirs, Vol. liii. (1909), No. *Z\. 



6'^. 3 1,2 (jiqo^ 



XXI. " Report on the Recent Foraminifera from the < 

 Coast of the Island of Delos (Grecian Archi- 

 pelago)." Part VI. (Conclusion.) 



By Henry Sidebottom. 



(Received and read April 6ih, igog.) 



Planorbulina, d'Orbigny. 



*Planorbulina mediterranensis, d'Orbigny. (PI. i, 

 Figs. 1-3). 



Planorlmlina vulgaris, d'Orbigny ('39), p. 134, pi. 2, 

 fig- 30. 



P. vulgaris (d'Orb.), William.son C58), p. 57, pi. 5, 

 figs. 119, 120. 



P. meditej'ranensis (d'Orb.), Brady ('84), p. 656, pi. 92, 

 figs. 1—3. 



P. mediterranensis fd'Orb.), Silvestri ('98), p. 286, pi. 6 

 (11), figs. 4-7. 



P. mediterranensis (d'Orb.), Flint ('99), p. 328, pi. 72, 

 fig. 6. 



This form occurs in three varieties. The first,'* Fig. i, 

 PI. I, is often of irregular growth, with inflated chambers, 

 and has the peripheral edge rounded. The second,* 

 Fig. 2, PI. I, has the peripheral edge sharp, and the under 

 surface quite flat. The third variety. Fig. 3, PI. i, has 

 also the peripheral edge sharp, or slightly blunted, but 

 the central portion of the free surface is covered with 

 irregular chambers. The planorbuline arrangement of 

 the segments on the underside (superior) is quite distinct, 

 as also are the apertures, though small. The first and 

 second varieties are frequent, and the third not quite so 

 frequent. 



* The asterisk denotes that this species occurs at Palermo. 

 June lltli, iQog. 



