BIHANG TILL K. SV. VET.-AKAD. IIANDL. BAND 28. AFD. IV. N:0 7. 11 



Plate I. 



Transverse sections of a very young Pluteus. 



Plate II. 



Transverse sections of an older Pluteus. 



Plate III. 



Transverse sections of a fully developed Pluteus with the sea-urchin 

 nearly outgrowu. 



k 



Tryckt den 26 juli 1902. 



