Plate 24 



Figs. 1 1. Petraliella grandicella, new species (p. 258). 



1. Fragments of the unilamellar zoarium, natural size. 



2. Surface, X 20, with ordinary zooecia. 



3. An ovicelled specimen, X20, showing also the bifid avicularian umbo. 

 1. Inferior side, X20. 



D. 5579. Sil.nl u Island, Darvel Bay, Borneo. 

 5-7. Petraliella trita, new species (p. 259). 



5. Unilamellar zoarial fragments, natural size. 



6. Zooecial surface, 20, showing the broad smooth spaces between the 



tremopores. 



7. Aunt her example, X20. 



I). 5579. Darvel Bay, Borneo. 



8. Petraliella elongata, new species (p. 259). 



The unilamellar zoarium, ■ 20, illustrating the much-elongated 

 zooecia. 



D. 5579. Darvel Bay, Borneo. 



(591) 



