Plate 15 



Page 

 Figs. 1-4. Sejnihaswellia sinuosa,new species 85 



1. A segment with its blanches; X 6. 



2. Ovicelled segment; X 20. 



3. Dorsal of a segment, X 20, showing the longitudinal 



sulci and the small sporadic avicularia. 



4. Portion of a segment showing the chitinous articulation 



of a branch on a basis ramae. 

 Albatross Station D. 2392, Gulf of Mexico. 



5. Tessaradoma gracile Sars, 1850, variety 86 



Portion of a branch, X 20, exhibiting large dimensions. 

 Albatross Station D. 2117, Caribbean Sea. 



6. Tubucellaria cereoides 'Ellis and Solander, 1786 113 



Portion of a segment; X 20. 



Fowey Light, 15 miles south of Miami, Fla. 



7,8. Cystisella americana, new species 113 



The bilamellar ovicelled type specimen, natural size and 



surface; X 20. 

 Albatross Station D. 2387, Gulf of Mexico. 



9-13. Smittina trispinosa spathulata Smitt, 1873 114 



9. Interior, X 20, showing the arrangement of the lyrule 

 and the cardelles at the same level. 

 10, 11. Two variations, X 20, showing form of the large 

 spathulated avicularium. 



12. Surface of unilamellar specimen, X 20, with avicularia 



long and very thin. Theie are small avicularia 

 around the apeiture. 



13. Unilamellar ovicelled specimen, X 20, with long thin 



avicularia and without spathulated avicularia. 

 Fowey Light, 15 miles south of Miami, Fla. 

 180 



