PLATE 24. 



Dromalia alexandri. 



Fig. 1. The region of proliferation. B.N, very youngnectophore; B. S,budsforthe future siphons; 

 St. S', gelatinous stalk on which a younger, St. S^, on which an older, siphon was borne. L. Mu; muscu- 

 lar lamella of older nectophore. X 4. 



Fig. 2. Enlarged view of same. Lettering as in preceding figure. Photographed from a dissec- 

 tion cleared in xylol. X 6. 



Fig. 3. Still more enlarged view of the youngest nectophores, and buds for siphons. X 9. 



Fig. 4. Radial section of colony through the aurophore (X) and zone of proliferation (B. S). 

 Pn, pneumatophore; Pn. pr, gelatinous prominence of pneumatocodon; Pa. Pr, papilliform processes 

 of aurophore; C, canals of siphosome. X 3. 



Fig. 5. Similar section of larger specimen. Lettering as in fig. 4. X 4. 



Fig. 6. Radial section of the aurophore. Ec', primary, Ec^, secondary ectoderm; En, endoderm; 

 Sm, septum connecting pneumatosaccus with pneumatocodon; Pa. Pr, papilhform process. X 20. 



Fig. 7. Transverse section of aurophore in its mid-region. Lettering as in fig 6. X 20. 



Fig. 8. Radial section of axial region of aurophore. Lettering as in fig. 6. This photograph hag 

 been slightly retouched. X about 30. 



Fig. 9. Radial section of terminal portion of papilliform process, showing the open terminal pore. 

 X40. 



All figures from photographs. 



