Plate 18 



Page 

 Figs. 1-3. Bryocryptella reticulata, new species 121 



1. Zoarial fragments, natural size. 



2. Fragment of a zoarium; X 20. The distal border of the 



apertural avicularium bears a Ij^rule. 



3. Ovicelled fragment of the same colony; X 20. 

 Albatross Station D. 2343, north of Cuba. 



4-6. Reteporella prominens, new species 124 



4. Fragment, natural size. 



5. Cellular face; X 20. 



6. Noncellular face of tlie same colony; X 20. 

 Albatross Station D. 2354, east of Yucatan. 



7-13. Retepora marsupiata Smitt, 1873 122 



7. Fragmentary zoaria, natural size. 



8. Ovicelled branch; X 20. Three zooecia have a large 



frontal avicularium. 



9. Interior; X 20. The peristomie is very long and is 



not perforated by a reteporidan pore. 



10. Zoaiial surface; X 20. The frontal is decorated with 



very small round avicularia. 



11. Noncellular face showing the arrangement of vibices; 



X20. 

 Albatross Station D. 2411, Gulf of Mexico. 



12. Ovicelled branch; X 20. There is one cell (at base) 



with a large avicularium. 



13. Branch showing the structure of the ovicell; X 20. 

 Albatross Station D. 2117, Caribbean Sea. 



183 



