PLATE XXVIII. 



Figures 1—11. 



Rhizammina. — Hypekammina. — Sagenella. 



-Ji/tizammina algceformis, Brady, 



Figs. 1, 2, 6. Specimens from sandy bottom ; figs. 3,4, 

 5, 7, 8, from Globigerina ooze. 



Fig. 1. Portion of a tuft, 



Figs. 2, 3, 4, 5. Incomplete specimens, 



Figs. 6, 7. Fragments more highly magnified, 



Fig. 8. Fragment with part of the arenaceous coating 

 removed, showing the chitinous envelope under- 

 neath, . 



Fig. 9. Specimen from sandy bottom, after treatment 

 with hydrochloric acid; mounted in Canada 

 balsam, ... 



Fig. 10. Specimen from Globigerina ooze, similarly 

 treated, . 



Fig. 11. Specimen from sandy bottom, after treatment 

 with solution of caustic potash; mounted in 

 Canada balsam, .... 



Diam. 



Natural size, 

 x 8 



40 



15 



40 



40 



40 



Page 

 274 



12, 13. — Hyperainmina arborescens, Norman, sp., 

 Fig. 12. Specimen growing upon a Polyzoon. 

 Fig. 13. Terminal branch with aperture, 



20 

 100 



262 



14, 15. — Sagenella frondescens, Brady, 



Specimens growing on fragments of Xullipore. 



10 



278 



