Plate 17 



Page 



Figs. 1-5. Mucronella egyptiaca Waters, 1909 118 



1,2. Cylindrical unilamellar specimen, natural size, and 

 surface; X 20. 



3. View of the dorsal by transparency showing the biserial 



arrangement of the zooecia; X 25. 



4. A similar view of the frontal, X 25, exhibiting the 



areolar pores. 



5. A zooecium of 4, X 85, showing the false tremopores 



formed in the pleurocyst and not perforating the 

 frontal. 

 Albatross Station D. 2389, Gulf of Mexico. 



6-10. Smittina lahellum, new species 116 



6, 7. Zooecia of the unilamellar zoarium, X 20, showing 

 the quite variable position of the large avicularium. 



8. Incrusting ovicelled specimen, X 20, with spathulated 



avicularia. 

 Albatross Station D. 2339, north of Cuba. 



9. Unilamellar ovicelled zoarium, X 20, with elongated 



zooecia. The lyrule is not visible. 



10. Structure of the frontal; X 85. 



Fowey Light, 15 miles south of Miami, Fla. 

 11-13. Umbonula undulata, new species 119 



11. The bilamellar zoarium, natural size. 



12. Zooecia, X 20, with umbo little salient and a few avic- 



ularia presence. 



13. Zooecia, X 20, illustrating the salient avicularian 



umbo and absence of avicularia. 

 Cedar Keys, Fla. 

 14-16. Palmicellaria aviculifera, new species 118 



14. The incrusting zoarium, natural size. 



15. Zooecia; X 20. 



16. Interior showing the true form of the aperture; X 20. 

 Albatross Station D. 2650, Bahama Islands. 



182 



