BY R. VON LENDENFELD, PH.D. 673 



Fig. 4. — Dcndrilla cax^ernosa. R. v. L. 



Transverse section through the pore membrane. Showing one 



pore. 

 1:80 magnified. 

 Alcohol, Hsematoxylin. 

 Fig. 5. — Dcndrilla cavernosa. R. v. L. 



Transverse section through the pore membrane showing the 



margin of a pore. 

 1 :800 magnified. 

 Alcohol, Htematoxylin specimen. 



(a.) Amreboid wandering cells. 



(m.) Muscular cells. 



(g.) Ganglia cells. 



(d) Gland cells. 



(s.) Sensitive cells. 



(p.) Flat epithel cells. 



Plate 40. 

 Fig. 6. — Raphyrus Hixonii. R. v. L. 

 Photographed from life. 

 En profil. 

 ^ of the natural size. 



Plate 41. 

 Fig. 7. — Raphyrus Hixonii. R. v. L. 



Transverse section through the outer portion of the sponge 



1:50 magnified. 



Alcohol, Hismotoxylin. 

 Fig. 8. — Raphyrus Hixonii. R. v. L. 



Some of the digestive amoeboid wandering cells in the soft tissue 

 of the internal meshes. 



Spirit specimen. 



1:400 magnified. 



Plate 42. 

 Fig. 9. — Raphyrus Hixonii. R. v. L. 



Transverse section through the outer portion of the sponge. 



1:15 magnified. 



Alcohol, Hsematoxylin. 

 Fig. 10. — Raphyrus Hixonii. R. v. L. 



Bidb ac. spicule. 



Most frequent shape in the supporting skeleton of the network. 



1:150 magnified. 



