PLATE VI 



Figs. 1-4. Marginal lappets of four species of Pegantha, showing the 

 difference in the peripheral canals and the otoporpae. 



Fig. I. Pegantha martagon Haeckel. St. 129. 



Fig. 2. Pegantha laevis H. H. Higelow. St. 1565. 



Fig. 3. Pegantha claiu R. P. Fiigelow. St. 697. 



Fig. 4. Pegantha yuhiginosa (Kol[lki:i}. 'Atlantide'. St. S3. 



Fig. 5. Ciiniiia diiplicata Maas. Aboral view of a specimen 50 mm. in 

 diameter. St. 1974. 



