﻿1 6 SlDEBOTTOM, Foraminifera from the Island of Deios. 



become flat, with the irregular ends of the chambers 

 slightly pointed. Very rare. 



Bolivina costata, d'Orbigny. (PI. 3, fig. 8). 



Bolivina costata, d'Orbigny ('39), p. 62, pi. 8, figs. 8, 9. 



B. costata (d'Orb.), Brady ('84), p. 426, pi. 53, figs. 

 26, 27. 



The one example found is more like Brady's figure 

 in the above reference, than d'Orbigny's unsatisfactory 

 illustration. Very rare. 



Mimosina, Millett. 

 *Mimosina hystrix, Millett, var. (PI. 3, fig. 9). 



Mimosina hystrix, Millett (:00), p. 549, pi. 4, fig. 14. 



I am indebted to Mr. Millett for his suggestion that 

 these specimens belong to the genus Mimosina. Such, 

 upon examination, proved to be the case, as indicated by 

 the texture of the shell-wall, and by the two apertures. 

 They are not typical of any of the forms as figured by 

 him in his Malay work, but come nearest to Mimosina 

 hystrix. They are triserial at the commencement, and 

 subsequently biserial, but the orifices differ as shown in 

 the one figured. The spines likewise are not so well 

 developed, and the tests are very often much more club- 

 headed than the one I have figured, which is caused by 

 the sudden inflation of the last two chambers. 



The triserial arrangement of the chambers at the 

 commencement is often difficult to trace. Frequent. 



CASSIDULININzE. 



Cassidulina, d'Orbigny. 

 ^Cassidulina laevigata, d'Orbigny. 



Cassidulina laevigata (d'Orb.), Williamson ('58), p. 68, 

 pi. 6, figs. 141, 142. 



